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how to column names of excel sheet into list dynamically using asp.net [duplicate]

How to read an Excel file using C#? I open an Excel file for reading and copy it to clipboard to search email format, but I don't know how to do it.
FileInfo finfo;
Excel.ApplicationClass ExcelObj = new Excel.ApplicationClass();
ExcelObj.Visible = false;
Excel.Workbook theWorkbook;
Excel.Worksheet worksheet;
if (listView1.Items.Count > 0)
{
foreach (ListViewItem s in listView1.Items)
{
finfo = new FileInfo(s.Text);
if (finfo.Extension == ".xls" || finfo.Extension == ".xlsx" || finfo.Extension == ".xlt" || finfo.Extension == ".xlsm" || finfo.Extension == ".csv")
{
theWorkbook = ExcelObj.Workbooks.Open(s.Text, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, false, false);
for (int count = 1; count <= theWorkbook.Sheets.Count; count++)
{
worksheet = (Excel.Worksheet)theWorkbook.Worksheets.get_Item(count);
worksheet.Activate();
worksheet.Visible = false;
worksheet.UsedRange.Cells.Select();
}
}
}
}

OK,
One of the more difficult concepts to grasp about Excel VSTO programming is that you don't refer to cells like an array, Worksheet[0][0] won't give you cell A1, it will error out on you. Even when you type into A1 when Excel is open, you are actually entering data into Range A1. Therefore you refer to cells as Named Ranges. Here's an example:
Excel.Worksheet sheet = workbook.Sheets["Sheet1"] as Excel.Worksheet;
Excel.Range range = sheet.get_Range("A1", Missing.Value)
You can now literally type:
range.Text // this will give you the text the user sees
range.Value2 // this will give you the actual value stored by Excel (without rounding)
If you want to do something like this:
Excel.Range range = sheet.get_Range("A1:A5", Missing.Value)
if (range1 != null)
foreach (Excel.Range r in range1)
{
string user = r.Text
string value = r.Value2
}
There might be a better way, but this has worked for me.
The reason you need to use Value2 and not Value is because the Value property is a parametrized and C# doesn't support them yet.
As for the cleanup code, i will post that when i get to work tomorrow, i don't have the code with me, but it's very boilerplate. You just close and release the objects in the reverse order you created them. You can't use a Using() block because the Excel.Application or Excel.Workbook doesn't implement IDisposable, and if you don't clean-up, you will be left with a hanging Excel objects in memory.
Note:
If you don't set the Visibility property Excel doesn't display, which can be disconcerting to your users, but if you want to just rip the data out, that is probably good enough
You could OleDb, that will work too.
I hope that gets you started, let me know if you need further clarification. I'll post a complete
here is a complete sample:
using System;
using System.IO;
using System.Reflection;
using NUnit.Framework;
using ExcelTools = Ms.Office;
using Excel = Microsoft.Office.Interop.Excel;
namespace Tests
{
[TestFixture]
public class ExcelSingle
{
[Test]
public void ProcessWorkbook()
{
string file = #"C:\Users\Chris\Desktop\TestSheet.xls";
Console.WriteLine(file);
Excel.Application excel = null;
Excel.Workbook wkb = null;
try
{
excel = new Excel.Application();
wkb = ExcelTools.OfficeUtil.OpenBook(excel, file);
Excel.Worksheet sheet = wkb.Sheets["Data"] as Excel.Worksheet;
Excel.Range range = null;
if (sheet != null)
range = sheet.get_Range("A1", Missing.Value);
string A1 = String.Empty;
if( range != null )
A1 = range.Text.ToString();
Console.WriteLine("A1 value: {0}", A1);
}
catch(Exception ex)
{
//if you need to handle stuff
Console.WriteLine(ex.Message);
}
finally
{
if (wkb != null)
ExcelTools.OfficeUtil.ReleaseRCM(wkb);
if (excel != null)
ExcelTools.OfficeUtil.ReleaseRCM(excel);
}
}
}
}
I'll post the functions from ExcelTools tomorrow, I don't have that code with me either.
Edit:
As promised, here are the Functions from ExcelTools you might need.
public static Excel.Workbook OpenBook(Excel.Application excelInstance, string fileName, bool readOnly, bool editable,
bool updateLinks) {
Excel.Workbook book = excelInstance.Workbooks.Open(
fileName, updateLinks, readOnly,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, editable, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);
return book;
}
public static void ReleaseRCM(object o) {
try {
System.Runtime.InteropServices.Marshal.ReleaseComObject(o);
} catch {
} finally {
o = null;
}
}
To be frank, this stuff is much easier if you use VB.NET. It's in C# because I didn't write it. VB.NET does option parameters well, C# does not, hence the Type.Missing. Once you typed Type.Missing twice in a row, you run screaming from the room!
As for you question, you can try to following:
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.range.find(VS.80).aspx
I will post an example when I get back from my meeting... cheers
Edit: Here is an example
range = sheet.Cells.Find("Value to Find",
Type.Missing,
Type.Missing,
Type.Missing,
Type.Missing,
Excel.XlSearchDirection.xlNext,
Type.Missing,
Type.Missing, Type.Missing);
range.Text; //give you the value found
Here is another example inspired by this site:
range = sheet.Cells.Find("Value to find", Type.Missing, Type.Missing,Excel.XlLookAt.xlWhole,Excel.XlSearchOrder.xlByColumns,Excel.XlSearchDirection.xlNext,false, false, Type.Missing);
It helps to understand the parameters.
P.S. I'm one of those weird people who enjoys learning COM automation. All this code steamed from a tool I wrote for work which required me to process over 1000+ spreadsheets from the lab each Monday.

You can use Microsoft.Office.Interop.Excel assembly to process excel files.
Right click on your project and go to Add reference. Add the
Microsoft.Office.Interop.Excel assembly.
Include using
Microsoft.Office.Interop.Excel; to make use of assembly.
Here is the sample code:
using Microsoft.Office.Interop.Excel;
//create the Application object we can use in the member functions.
Microsoft.Office.Interop.Excel.Application _excelApp = new Microsoft.Office.Interop.Excel.Application();
_excelApp.Visible = true;
string fileName = "C:\\sampleExcelFile.xlsx";
//open the workbook
Workbook workbook = _excelApp.Workbooks.Open(fileName,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);
//select the first sheet
Worksheet worksheet = (Worksheet)workbook.Worksheets[1];
//find the used range in worksheet
Range excelRange = worksheet.UsedRange;
//get an object array of all of the cells in the worksheet (their values)
object[,] valueArray = (object[,])excelRange.get_Value(
XlRangeValueDataType.xlRangeValueDefault);
//access the cells
for (int row = 1; row <= worksheet.UsedRange.Rows.Count; ++row)
{
for (int col = 1; col <= worksheet.UsedRange.Columns.Count; ++col)
{
//access each cell
Debug.Print(valueArray[row, col].ToString());
}
}
//clean up stuffs
workbook.Close(false, Type.Missing, Type.Missing);
Marshal.ReleaseComObject(workbook);
_excelApp.Quit();
Marshal.FinalReleaseComObject(_excelApp);

Why don't you create OleDbConnection? There are a lot of available resources in the Internet. Here is an example
OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+filename+";Extended Properties=Excel 8.0");
con.Open();
try
{
//Create Dataset and fill with imformation from the Excel Spreadsheet for easier reference
DataSet myDataSet = new DataSet();
OleDbDataAdapter myCommand = new OleDbDataAdapter(" SELECT * FROM ["+listname+"$]" , con);
myCommand.Fill(myDataSet);
con.Close();
richTextBox1.AppendText("\nDataSet Filled");
//Travers through each row in the dataset
foreach (DataRow myDataRow in myDataSet.Tables[0].Rows)
{
//Stores info in Datarow into an array
Object[] cells = myDataRow.ItemArray;
//Traverse through each array and put into object cellContent as type Object
//Using Object as for some reason the Dataset reads some blank value which
//causes a hissy fit when trying to read. By using object I can convert to
//String at a later point.
foreach (object cellContent in cells)
{
//Convert object cellContect into String to read whilst replacing Line Breaks with a defined character
string cellText = cellContent.ToString();
cellText = cellText.Replace("\n", "|");
//Read the string and put into Array of characters chars
richTextBox1.AppendText("\n"+cellText);
}
}
//Thread.Sleep(15000);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
//Thread.Sleep(15000);
}
finally
{
con.Close();
}

try
{
DataTable sheet1 = new DataTable("Excel Sheet");
OleDbConnectionStringBuilder csbuilder = new OleDbConnectionStringBuilder();
csbuilder.Provider = "Microsoft.ACE.OLEDB.12.0";
csbuilder.DataSource = fileLocation;
csbuilder.Add("Extended Properties", "Excel 12.0 Xml;HDR=YES");
string selectSql = #"SELECT * FROM [Sheet1$]";
using (OleDbConnection connection = new OleDbConnection(csbuilder.ConnectionString))
using (OleDbDataAdapter adapter = new OleDbDataAdapter(selectSql, connection))
{
connection.Open();
adapter.Fill(sheet1);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
This worked for me. Please try it and let me know for queries.

First of all, it's important to know what you mean by "open an Excel file for reading and copy it to clipboard..."
This is very important because there are many ways you could do that depending just on what you intend to do. Let me explain:
If you want to read a set of data and copy that in the clipboard and you know the data format (e.g. column names), I suggest you use an OleDbConnection to open the file, this way you can treat the xls file content as a Database Table, so you can read data with SQL instruction and treat the data as you want.
If you want to do operations on the data with the Excel object model then open it in the way you began.
Some time it's possible to treat an xls file as a kind of csv file, there are tools like File Helpers which permit you to treat and open an xls file in a simple way by mapping a structure on an arbitrary object.
Another important point is in which Excel version the file is.
I have, unfortunately I say, a strong experience working with Office automation in all ways, even if bounded in concepts like Application Automation, Data Management and Plugins, and generally I suggest only as the last resort, to using Excel automation or Office automation to read data; just if there aren't better ways to accomplish that task.
Working with automation could be heavy in performance, in terms of resource cost, could involve in other issues related for example to security and more, and last but not at least, working with COM interop it's not so "free"..
So my suggestion is think and analyze the situation within your needs and then take the better way.

Here's a 2020 answer - if you don't need to support the older .xls format (so pre 2003) you could use either:
LightweightExcelReader to access specfic cells, or cursor through all the data in a spreadsheet.
or
ExcelToEnumerable if you want to map spreadsheet data to a list of objects.
Pros :
Performance - at the time of writing (the the fastest way to read an .xlsx file)[https://github.com/ChrisHodges/ExcelToEnumerable#performance].
Simplicity - less verbose than OLE DB or OpenXml
Cons:
Neither LightweightExcelReader nor ExcelToEnumerable support .xls files.
Disclaimer: I am the author of LightweightExcelReader and ExcelToEnumerable

Use Open XML.
Here is some code to process a spreadsheet with a specific tab or sheet name and dump it to something like CSV. (I chose a pipe instead of comma).
I wish it was easier to get the value from a cell, but I think this is what we are stuck with. You can see that I reference the MSDN documents where I got most of this code. That is what Microsoft recommends.
/// <summary>
/// Got code from: https://msdn.microsoft.com/en-us/library/office/gg575571.aspx
/// </summary>
[Test]
public void WriteOutExcelFile()
{
var fileName = "ExcelFiles\\File_With_Many_Tabs.xlsx";
var sheetName = "Submission Form"; // Existing tab name.
using (var document = SpreadsheetDocument.Open(fileName, isEditable: false))
{
var workbookPart = document.WorkbookPart;
var sheet = workbookPart.Workbook.Descendants<Sheet>().FirstOrDefault(s => s.Name == sheetName);
var worksheetPart = (WorksheetPart)(workbookPart.GetPartById(sheet.Id));
var sheetData = worksheetPart.Worksheet.Elements<SheetData>().First();
foreach (var row in sheetData.Elements<Row>())
{
foreach (var cell in row.Elements<Cell>())
{
Console.Write("|" + GetCellValue(cell, workbookPart));
}
Console.Write("\n");
}
}
}
/// <summary>
/// Got code from: https://msdn.microsoft.com/en-us/library/office/hh298534.aspx
/// </summary>
/// <param name="cell"></param>
/// <param name="workbookPart"></param>
/// <returns></returns>
private string GetCellValue(Cell cell, WorkbookPart workbookPart)
{
if (cell == null)
{
return null;
}
var value = cell.CellFormula != null
? cell.CellValue.InnerText
: cell.InnerText.Trim();
// If the cell represents an integer number, you are done.
// For dates, this code returns the serialized value that
// represents the date. The code handles strings and
// Booleans individually. For shared strings, the code
// looks up the corresponding value in the shared string
// table. For Booleans, the code converts the value into
// the words TRUE or FALSE.
if (cell.DataType == null)
{
return value;
}
switch (cell.DataType.Value)
{
case CellValues.SharedString:
// For shared strings, look up the value in the
// shared strings table.
var stringTable =
workbookPart.GetPartsOfType<SharedStringTablePart>()
.FirstOrDefault();
// If the shared string table is missing, something
// is wrong. Return the index that is in
// the cell. Otherwise, look up the correct text in
// the table.
if (stringTable != null)
{
value =
stringTable.SharedStringTable
.ElementAt(int.Parse(value)).InnerText;
}
break;
case CellValues.Boolean:
switch (value)
{
case "0":
value = "FALSE";
break;
default:
value = "TRUE";
break;
}
break;
}
return value;
}

Use OLEDB Connection to communicate with excel files. it gives better result
using System.Data.OleDb;
string physicalPath = "Your Excel file physical path";
OleDbCommand cmd = new OleDbCommand();
OleDbDataAdapter da = new OleDbDataAdapter();
DataSet ds = new DataSet();
String strNewPath = physicalPath;
String connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
String query = "SELECT * FROM [Sheet1$]"; // You can use any different queries to get the data from the excel sheet
OleDbConnection conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed) conn.Open();
try
{
cmd = new OleDbCommand(query, conn);
da = new OleDbDataAdapter(cmd);
da.Fill(ds);
}
catch
{
// Exception Msg
}
finally
{
da.Dispose();
conn.Close();
}
The Output data will be stored in dataset, using the dataset object you can easily access the datas.
Hope this may helpful

Using OlebDB, we can read excel file in C#, easily, here is the code while working with Web-Form, where FileUpload1 is file uploading tool
string path = Server.MapPath("~/Uploads/");
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//get file path
filePath = path + Path.GetFileName(FileUpload1.FileName);
//get file extenstion
string extension = Path.GetExtension(FileUpload1.FileName);
//save file on "Uploads" folder of project
FileUpload1.SaveAs(filePath);
string conString = string.Empty;
//check file extension
switch (extension)
{
case ".xls": //Excel 97-03.
conString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Excel03ConString;Extended Properties='Excel 8.0;HDR=YES'";
break;
case ".xlsx": //Excel 07 and above.
conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Excel07ConString;Extended Properties='Excel 8.0;HDR=YES'";
break;
}
//create datatable object
DataTable dt = new DataTable();
conString = string.Format(conString, filePath);
//Use OldDb to read excel
using (OleDbConnection connExcel = new OleDbConnection(conString))
{
using (OleDbCommand cmdExcel = new OleDbCommand())
{
using (OleDbDataAdapter odaExcel = new OleDbDataAdapter())
{
cmdExcel.Connection = connExcel;
//Get the name of First Sheet.
connExcel.Open();
DataTable dtExcelSchema;
dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
connExcel.Close();
//Read Data from First Sheet.
connExcel.Open();
cmdExcel.CommandText = "SELECT * From [" + sheetName + "]";
odaExcel.SelectCommand = cmdExcel;
odaExcel.Fill(dt);
connExcel.Close();
}
}
}
//bind datatable with GridView
GridView1.DataSource = dt;
GridView1.DataBind();
Source : https://qawithexperts.com/article/asp-net/read-excel-file-and-import-data-into-gridview-using-datatabl/209
Console application similar code example
https://qawithexperts.com/article/c-sharp/read-excel-file-in-c-console-application-example-using-oledb/168
If you need don't want to use OleDB, you can try https://github.com/ExcelDataReader/ExcelDataReader
which seems to have the ability to handle both formats (.xls and .xslx)

Excel File Reader & Writer Without Excel On u'r System
Download and add the dll for
NPOI u'r project.
Using this code to read a excel file.
using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
XSSFWorkbook XSSFWorkbook = new XSSFWorkbook(file);
}
ISheet objxlWorkSheet = XSSFWorkbook.GetSheetAt(0);
int intRowCount = 1;
int intColumnCount = 0;
for (; ; )
{
IRow Row = objxlWorkSheet.GetRow(intRowCount);
if (Row != null)
{
ICell Cell = Row.GetCell(0);
ICell objCell = objxlWorkSheet.GetRow(intRowCount).GetCell(intColumnCount); }}

You can use ExcelDataReader see GitHub
You need to install nugets :
-ExcelDataReader
-ExcelDataReader.DataSet
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.IO;
using ExcelDataReader;
using System.Text;
/// <summary>
/// Excel parsing in this class is performed by using a common shareware Lib found on:
/// https://github.com/ExcelDataReader/ExcelDataReader
/// </summary>
public static class ExcelParser
{
/// <summary>
/// Load, read and get values from Excel sheet
/// </summary>
public static List<FileRow> GetExcelRows(string path, string sheetName, bool skipFirstLine)
{
if (File.Exists(path))
{
return GetValues(path, sheetName, skipFirstLine);
}
else
throw new Exception("The process cannot access the file");
}
/// <summary>
/// Parse sheet names from given Excel file.
/// </summary>
public static List<string> GetSheetNames(string path)
{
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
using (var excelReader = GetExcelDataReader(path, stream))
{
var dataset = excelReader.AsDataSet(new ExcelDataSetConfiguration()
{
ConfigureDataTable = (_) => new ExcelDataTableConfiguration()
{
UseHeaderRow = true
}
});
var names = from DataTable table in dataset.Tables
select table.TableName;
return names.ToList();
}
}
}
/// <summary>
/// Parse values from Excel sheet and add to Rows collection.
/// </summary>
public static List<FileRow> GetValues(string path, string sheetName, bool skipFirstLine)
{
var rowItems = new List<FileRow>();
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (var excelReader = GetExcelDataReader(path, stream))
{
var dataset = excelReader.AsDataSet(new ExcelDataSetConfiguration()
{
ConfigureDataTable = (_) => new ExcelDataTableConfiguration()
{
UseHeaderRow = skipFirstLine
}
});
foreach (DataRow row in dataset.Tables[sheetName].Rows)
{
var rowItem = new FileRow();
foreach (var value in row.ItemArray)
rowItem.Values.Add(value);
rowItems.Add(rowItem);
}
}
}
return rowItems;
}
private static IExcelDataReader GetExcelDataReader(string path, Stream stream)
{
var extension = GetExtension(path);
switch (extension)
{
case "xls":
return ExcelReaderFactory.CreateBinaryReader(stream);
case "xlsx":
return ExcelReaderFactory.CreateOpenXmlReader(stream);
default:
throw new Exception(string.Format("'{0}' is not a valid Excel extension", extension));
}
}
private static string GetExtension(string path)
{
var extension = Path.GetExtension(path);
return extension == null ? null : extension.ToLower().Substring(1);
}
}
With this entity :
public class FileRow
{
public List<object> Values { get; set; }
public FileRow()
{
Values = new List<object>();
}
}
Use like that :
var txtPath = #"D:\Path\excelfile.xlsx";
var sheetNames = ExcelParser.GetSheetNames(txtPath);
var datas = ExcelParser.GetExcelRows(txtPath, sheetNames[0], true);

The recommended way to read Excel files on server side app is Open XML.
Sharing few links -
https://msdn.microsoft.com/en-us/library/office/hh298534.aspx
https://msdn.microsoft.com/en-us/library/office/ff478410.aspx
https://msdn.microsoft.com/en-us/library/office/cc823095.aspx

public void excelRead(string sheetName)
{
Excel.Application appExl = new Excel.Application();
Excel.Workbook workbook = null;
try
{
string methodName = "";
Excel.Worksheet NwSheet;
Excel.Range ShtRange;
//Opening Excel file(myData.xlsx)
appExl = new Excel.Application();
workbook = appExl.Workbooks.Open(sheetName, Missing.Value, ReadOnly: false);
NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1);
ShtRange = NwSheet.UsedRange; //gives the used cells in sheet
int rCnt1 = 0;
int cCnt1 = 0;
for (rCnt1 = 1; rCnt1 <= ShtRange.Rows.Count; rCnt1++)
{
for (cCnt1 = 1; cCnt1 <= ShtRange.Columns.Count; cCnt1++)
{
if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "Y")
{
methodName = NwSheet.Cells[rCnt1, cCnt1 - 2].Value2;
Type metdType = this.GetType();
MethodInfo mthInfo = metdType.GetMethod(methodName);
if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1 - 2].Value2) == "fn_AddNum" || Convert.ToString(NwSheet.Cells[rCnt1, cCnt1 - 2].Value2) == "fn_SubNum")
{
StaticVariable.intParam1 = Convert.ToInt32(NwSheet.Cells[rCnt1, cCnt1 + 3].Value2);
StaticVariable.intParam2 = Convert.ToInt32(NwSheet.Cells[rCnt1, cCnt1 + 4].Value2);
object[] mParam1 = new object[] { StaticVariable.intParam1, StaticVariable.intParam2 };
object result = mthInfo.Invoke(this, mParam1);
StaticVariable.intOutParam1 = Convert.ToInt32(result);
NwSheet.Cells[rCnt1, cCnt1 + 5].Value2 = Convert.ToString(StaticVariable.intOutParam1) != "" ? Convert.ToString(StaticVariable.intOutParam1) : String.Empty;
}
else
{
object[] mParam = new object[] { };
mthInfo.Invoke(this, mParam);
NwSheet.Cells[rCnt1, cCnt1 + 5].Value2 = StaticVariable.outParam1 != "" ? StaticVariable.outParam1 : String.Empty;
NwSheet.Cells[rCnt1, cCnt1 + 6].Value2 = StaticVariable.outParam2 != "" ? StaticVariable.outParam2 : String.Empty;
}
NwSheet.Cells[rCnt1, cCnt1 + 1].Value2 = StaticVariable.resultOut;
NwSheet.Cells[rCnt1, cCnt1 + 2].Value2 = StaticVariable.resultDescription;
}
else if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "N")
{
MessageBox.Show("Result is No");
}
else if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "EOF")
{
MessageBox.Show("End of File");
}
}
}
workbook.Save();
workbook.Close(true, Missing.Value, Missing.Value);
appExl.Quit();
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(ShtRange);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(NwSheet);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(workbook);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(appExl);
}
catch (Exception)
{
workbook.Close(true, Missing.Value, Missing.Value);
}
finally
{
GC.Collect();
GC.WaitForPendingFinalizers();
System.Runtime.InteropServices.Marshal.CleanupUnusedObjectsInCurrentContext();
}
}
//code for reading excel data in datatable
public void testExcel(string sheetName)
{
try
{
MessageBox.Show(sheetName);
foreach(Process p in Process.GetProcessesByName("EXCEL"))
{
p.Kill();
}
//string fileName = "E:\\inputSheet";
Excel.Application oXL;
Workbook oWB;
Worksheet oSheet;
Range oRng;
// creat a Application object
oXL = new Excel.Application();
// get WorkBook object
oWB = oXL.Workbooks.Open(sheetName);
// get WorkSheet object
oSheet = (Microsoft.Office.Interop.Excel.Worksheet)oWB.Sheets[1];
System.Data.DataTable dt = new System.Data.DataTable();
//DataSet ds = new DataSet();
//ds.Tables.Add(dt);
DataRow dr;
StringBuilder sb = new StringBuilder();
int jValue = oSheet.UsedRange.Cells.Columns.Count;
int iValue = oSheet.UsedRange.Cells.Rows.Count;
// get data columns
for (int j = 1; j <= jValue; j++)
{
oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[1, j];
string strValue = oRng.Text.ToString();
dt.Columns.Add(strValue, System.Type.GetType("System.String"));
}
//string colString = sb.ToString().Trim();
//string[] colArray = colString.Split(':');
// get data in cell
for (int i = 2; i <= iValue; i++)
{
dr = dt.NewRow();
for (int j = 1; j <= jValue; j++)
{
oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[i, j];
string strValue = oRng.Text.ToString();
dr[j - 1] = strValue;
}
dt.Rows.Add(dr);
}
if(StaticVariable.dtExcel != null)
{
StaticVariable.dtExcel.Clear();
StaticVariable.dtExcel = dt.Copy();
}
else
StaticVariable.dtExcel = dt.Copy();
oWB.Close(true, Missing.Value, Missing.Value);
oXL.Quit();
MessageBox.Show(sheetName);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
}
}
//code for class initialize
public static void startTesting(TestContext context)
{
Playback.Initialize();
ReadExcel myClassObj = new ReadExcel();
string sheetName="";
StreamReader sr = new StreamReader(#"E:\SaveSheetName.txt");
sheetName = sr.ReadLine();
sr.Close();
myClassObj.excelRead(sheetName);
myClassObj.testExcel(sheetName);
}
//code for test initalize
public void runValidatonTest()
{
DataTable dtFinal = StaticVariable.dtExcel.Copy();
for (int i = 0; i < dtFinal.Rows.Count; i++)
{
if (TestContext.TestName == dtFinal.Rows[i][2].ToString() && dtFinal.Rows[i][3].ToString() == "Y" && dtFinal.Rows[i][4].ToString() == "TRUE")
{
MessageBox.Show(TestContext.TestName);
MessageBox.Show(dtFinal.Rows[i][2].ToString());
StaticVariable.runValidateResult = "true";
break;
}
}
//StaticVariable.dtExcel = dtFinal.Copy();
}

I'd recommend you to use Bytescout Spreadsheet.
https://bytescout.com/products/developer/spreadsheetsdk/bytescoutspreadsheetsdk.html
I tried it with Monodevelop in Unity3D and it is pretty straight forward. Check this sample code to see how the library works:
https://bytescout.com/products/developer/spreadsheetsdk/read-write-excel.html

Referencing an Excel file, workbook, worksheet in C#

All,
I have been struggling to simply reference an Excel file so that I can extract its data into a new worksheet automatically.
I know this means to create a new Excel file and its items:
Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;
Excel.Range oRng;
//Start Excel and get Application object.
oXL = new Excel.Application();
oXL.Visible = true;
//Get a new workbook.
oWB = (Excel._Workbook)(oXL.Workbooks.Add(Missing.Value));
oSheet = (Excel._Worksheet)oWB.ActiveSheet;
But this is where I am lost...I want the user to select another Excel file through a file dialog and then I want to copy data from said file into the new workbook above.
Ex: New file, user selects "MyExcel.csv". How would I reference this so that I can, say, copy Column A into the new worksheet? Whatever works with C#.

Maybe this helps:
Make sure your manage your Nugets and add the reference "Microsoft.Office.Interop.Excel" --> (References (Right click) --> Manage Nuget Packages --> Browse --> "Microsoft.Office.Interop.Excel" --> Install)
Note: This is is a copy paste into the same worksheet. To copy the data into another worksheet from another file just pass the "worksheet" as parameter to the method and paste it there.
public class Excel1
{
private readonly string excelSufix = ".xlsx";
private readonly string excelFilePrefix = "..."; //Where you excel file is located
private string getFilePath(string fileName)
{
return excelFilePrefix + fileName + excelSufix; //returns the file path by the given file name
}
public void CopyPaste(string fileName, int worksheet, string toCopyRange, string whereInsertRange)
{
//Range should look like = "A:C" or "D:F"
var excelApp = new Microsoft.Office.Interop.Excel.Application();
excelApp.Visible = true;
var workBook = excelApp.Workbooks.Open(getFilePath(fileName));
var workSheet = (Microsoft.Office.Interop.Excel.Worksheet)workBook.Sheets[worksheet];
var toCopy = workSheet.Range[toCopyRange];
var whereInsert = workSheet.Range[whereInsertRange];
whereInsert.Insert(Microsoft.Office.Interop.Excel.XlInsertShiftDirection.xlShiftToRight, toCopy.Cut());
}
}
Edit: You could add a constructor to the class where you pass the file Path and some class variables which reference the file, the worksheet etc etc... In this case, you will have independent objects for each file

Based on your description, you want to copy one column from the csv file and paste in the new excel file.
First, I convert the csv file to datatable.
Second, I select the specific column and convert one column to datatable.
Third, I convert the datatable to the new excel file.
You can try the following code.
using System;
using System.Data;
using Excel = Microsoft.Office.Interop.Excel;
class Program
{
static void Main(string[] args)
{
string path = "D:\\t.csv";
DataTable table = ReadCsv(path);
table= new DataView(table).ToTable(false, "Tests");
ExportToExcel(table, "D:\\t.xlsx");
}
public static DataTable ReadCsv(string path)
{
Microsoft.Office.Interop.Excel.Application objXL = null;
Microsoft.Office.Interop.Excel.Workbook objWB = null;
objXL = new Microsoft.Office.Interop.Excel.Application();
objWB = objXL.Workbooks.Open(path);
Microsoft.Office.Interop.Excel.Worksheet objSHT = objWB.Worksheets[1];
int rows = objSHT.UsedRange.Rows.Count;
int cols = objSHT.UsedRange.Columns.Count;
DataTable dt = new DataTable();
int noofrow = 1;
for (int c = 1; c <= cols; c++)
{
string colname = objSHT.Cells[1, c].Text;
dt.Columns.Add(colname);
noofrow = 2;
}
for (int r = noofrow; r <= rows; r++)
{
DataRow dr = dt.NewRow();
for (int c = 1; c <= cols; c++)
{
dr[c - 1] = objSHT.Cells[r, c].Text;
}
dt.Rows.Add(dr);
}
objWB.Close();
objXL.Quit();
return dt;
}
public static void ExportToExcel( DataTable tbl, string excelFilePath = null)
{
try
{
if (tbl == null || tbl.Columns.Count == 0)
throw new Exception("ExportToExcel: Null or empty input table!\n");
// load excel, and create a new workbook
var excelApp = new Excel.Application();
excelApp.Workbooks.Add();
// single worksheet
Excel._Worksheet workSheet = excelApp.ActiveSheet;
// column headings
for (var i = 0; i < tbl.Columns.Count; i++)
{
workSheet.Cells[1, i + 1] = tbl.Columns[i].ColumnName;
}
// rows
for (var i = 0; i < tbl.Rows.Count; i++)
{
// to do: format datetime values before printing
for (var j = 0; j < tbl.Columns.Count; j++)
{
workSheet.Cells[i + 2, j + 1] = tbl.Rows[i][j];
}
}
// check file path
if (!string.IsNullOrEmpty(excelFilePath))
{
try
{
workSheet.SaveAs(excelFilePath);
excelApp.Quit();
Console.WriteLine("Excel file saved!");
}
catch (Exception ex)
{
throw new Exception("ExportToExcel: Excel file could not be saved! Check filepath.\n"
+ ex.Message);
}
}
else
{ // no file path is given
excelApp.Visible = true;
}
}
catch (Exception ex)
{
throw new Exception("ExportToExcel: \n" + ex.Message);
}
}
}
Initial csv file.
The excel file:

I'm trying to read a Regex from an xml file but when i pass on the Regex to the C# code but I'm getting false matches

When i give my Regex by Xml I'm getting False matches but when I hardcode the Regex in the C# code I'm getting the right Matches , please help me out.
The code was working fine when I directly put the Regex in the Code. The problem started when I began to use XMl file
public static List<string> RegxFind(string path, string XmlPath)
{
string Patterns = "";
XmlReader reader = XmlReader.Create(XmlPath);
while (reader.Read())
{
if (reader.IsStartElement())
{
switch (reader.Name.ToString())
{
case "reg1":
Console.WriteLine(reader.Value);
Console.ReadKey();
Patterns = reader.Value;
break;
}
}
}
List<string> Results = new List<string>();
Excel.Application xlapp = new Excel.Application();
Excel.Workbooks xlworkbooks = xlapp.Workbooks;
//string Pattern = #"\b[0-9DEF]{2}[A-z]{ 2}[0-9]{6}[0-9]{3}|[0-9DEF]{2}[A-z]{2}[0-9]{6}[\S\s][0-9]{3}|[0-9DEF]{2}[A-z]{2}[0-9]{6}[\S\s][\s][0-9]{3}|[0-9DEF]{2}[A-z]{2}[\s\W\d]{8,12}\b";
try
{
xlapp = new Excel.Application();
xlapp.Visible = true;
xlworkbooks = xlapp.Workbooks;
Excel.Workbook xlworkbook = xlworkbooks.Open(path);
Excel.Sheets xlsheets = xlworkbook.Worksheets;
Excel._Worksheet xlsheet = xlworkbook.Sheets[1];
Excel.Range xlRange = xlsheet.UsedRange;
int rowCount = xlRange.Rows.Count;
int colCount = xlRange.Columns.Count;
for (int i = 1; i <= rowCount; i++)
{
for (int j = 1; j <= colCount; j++)
{
if (xlRange.Cells[i, j].value != null)
{
//Console.WriteLine("vlues" + xlRange.Cells[i, j].Value);
//Console.ReadKey();
string tempstr = Convert.ToString((xlRange.Cells[i, j].Value));
Match m = Regex.Match(tempstr, Patterns);
if (m.Success)
{
Results.Add((xlRange.Cells[i, j].Value) + "<>");
tempstr = "";
}
else
{
tempstr = "";
m.NextMatch();
}
}
else
{
continue;
}
}
}
xlworkbook.Close();
xlapp.Quit();
return Results;
}
catch (Exception es)
{
Console.WriteLine("error:" + es);
Console.ReadKey();
return Results;
}
}
The problem is , when I'm reading from the xml file I'm unable to get proper match as the Pattern variable is not receiving any value at line Regx.match(tempstr,patterns)
I want The code to give me correct pattern Matches
here the xml for reference :
<?xml version="1.0" encoding="UTF-8"?>
<pattern>
<reg1>#"\b[0-9DEF]{2}[A-z]{ 2}[0-9]{6}[0-9]{3}|[0-9DEF]{2}[A-z]{2}[0-9]{6}[\S\s][0-9]{3}|[0-9DEF]{2}[A-z]{2}[0-9]{6}[\S\s][\s][0-9]{3}|[0-9DEF]{2}[A-z]{2}[\s\W\d]{8,12}\b"</reg1>
</pattern>

First, fix your pattern a bit: 1) group the alternatives so that word boundaries could be applied to all the alternatives, 2) replace [A-z] with [A-Za-z] to match just ASCII letters and 3) remove spaces inside limiting quantifiers.
So, it should at least look like
\b(?:[0-9DEF]{2}[A-Za-z]{2}[0-9]{6}[0-9]{3}|[0-9DEF]{2}[A-Za-z]{2}[0-9]{6}[\S\s][0-9]{3}|[0-9DEF]{2}[A-Za-z]{2}[0-9]{6}[\S\s][\s][0-9]{3}|[0-9DEF]{2}[A-Za-z]{2}[\s\W\d]{8,12})\b
You may further contract it by grouping it further as the [0-9DEF]{2}[A-Za-z]{2} starts all the alternatives:
\b[0-9DEF]{2}[A-Za-z]{2}(?:[0-9]{6}(?:[0-9]{3}|[\S\s]\s?[0-9]{3})|[\s\W\d]{8,12})\b
See the regex demo.
Put it into a Patterns.xml file as a string inside a CDATA block to avoid having to escape chars:
<?xml version="1.0" encoding="UTF-8"?>
<pattern>
<reg1><![CDATA[\b[0-9DEF]{2}[A-Za-z]{2}(?:[0-9]{6}(?:[0-9]{3}|[\S\s]\s?[0-9]{3})|[\s\W\d]{8,12})\b]]></reg1>
</pattern>
Read it:
public static string RegxFind(string XmlPath)
{
var xml = XDocument.Load(XmlPath);
return xml.Root.Descendants("reg1").FirstOrDefault()?.Value;
}
Then, read it into any variable, static or not:
var pattern = RegxFind(path_to_xml);
and use the pattern.

Display and read an Excel file into a datagridview

I have successfully displayed the data using a code I found at this particular website. The problem is, the colour, bold or italics of the font isn't carried over. I need to read the code of a specific cell and convert it into a HTML string and display it as a textbox elsewhere. So I really need to learn how to import colour, bold or italics so I can convert it too. I will be eternally grateful to any kind soul who helps me on this one. Below is my current code.
string PathConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + textBox1.Text + ";Extended Properties=\"Excel 8.0;HDR=Yes;\";";
OleDbConnection conn = new OleDbConnection(PathConn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter("Select * from [sheet1$]", conn);
DataTable dt = new DataTable();
myDataAdapter.Fill(dt);
dataGridView1.DataSource = dt;

The following opens an Excel file in the app folder, get cell value, fore color, see if bold and italic is set for range sheet1 cell H2. Please note there is a decent amount of code which is warranted so that all objects used here are released upon finishing our work.
using System;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
namespace WindowsFormsApplication1_CS
{
public class ExcelCode
{
public System.Drawing.Color ForeColor;
public ExcelCode() { }
public string GetCellValue(
string FileName,
string SheetName,
string CellAddress)
{
string CellValue = "";
if (System.IO.File.Exists(FileName))
{
bool Proceed = false;
Excel.Application xlApp = null;
Excel.Workbooks xlWorkBooks = null;
Excel.Workbook xlWorkBook = null;
Excel.Worksheet xlWorkSheet = null;
Excel.Sheets xlWorkSheets = null;
Excel.Range xlCells = null;
xlApp = new Excel.Application();
xlApp.DisplayAlerts = false;
xlWorkBooks = xlApp.Workbooks;
xlWorkBook = xlWorkBooks.Open(FileName);
xlApp.Visible = false;
xlWorkSheets = xlWorkBook.Sheets;
for (int x = 1; x <= xlWorkSheets.Count; x++)
{
xlWorkSheet = (Excel.Worksheet)xlWorkSheets[x];
if (xlWorkSheet.Name == SheetName)
{
Proceed = true;
break;
}
System.Runtime.InteropServices
.Marshal.FinalReleaseComObject(xlWorkSheet);
xlWorkSheet = null;
}
if (Proceed)
{
xlCells = xlWorkSheet.Range[CellAddress];
try
{
Console.WriteLine("Bold: {0}", xlCells.Font.Bold); // bool
Console.WriteLine("Italic: {0}", xlCells.Font.Italic); // bool
ForeColor = System.Drawing.ColorTranslator.FromOle((int)xlCells.Font.Color);
CellValue = Convert.ToString(xlCells.Value);
}
catch (Exception)
{
// Reduntant
CellValue = "";
}
}
else
{
MessageBox.Show(SheetName + " not found.");
}
xlWorkBook.Close();
xlApp.UserControl = true;
xlApp.Quit();
ReleaseComObject(xlCells);
ReleaseComObject(xlWorkSheets);
ReleaseComObject(xlWorkSheet);
ReleaseComObject(xlWorkBook);
ReleaseComObject(xlWorkBooks);
ReleaseComObject(xlApp);
}
else
{
MessageBox.Show("'" + FileName +
"' not located. Try one of the write examples first.");
}
return CellValue;
}
public static void ReleaseComObject(object obj)
{
try
{
if (obj != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
}
catch (Exception)
{
obj = null;
}
}
}
}
Form code which works from a button and has a panel
var demoExcel = new ExcelCode();
// open an Excel file in the app folder, get information from H2 in Sheet1
textBox1.Text = demoExcel
.GetCellValue(
Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Demo.xlsx"),
"Sheet1",
"H2");
// Form has a panel, set back color to Sheet1.H2 color
panel1.BackColor = demoExcel.ForeColor;
// Translate the color to HTML
var htmlColor = System.Drawing.ColorTranslator.ToHtml(demoExcel.ForeColor);
Console.WriteLine(htmlColor.ToString());

C# not creating the excel file and cannot write in different excel sheets

First of all in my code im opening an excel sheet and reading it into a list. Second of all im closing this excel sheet and creating a new excel sheet:
excel_init("C:\\Users\\oma\\Desktop\\excel2.xlsx"); // this path does NOT exist yet
Next its going to this method:
static void excel_init(String path)
{
appExcel = new Microsoft.Office.Interop.Excel.ApplicationClass();
if (System.IO.File.Exists(path))
{
// then go and load this into excel
newWorkbook_First = appExcel.Workbooks.Open(path, true, true);
objsheet = (_Worksheet)appExcel.ActiveWorkbook.ActiveSheet;
}
else
{
try
{
appExcel = new Microsoft.Office.Interop.Excel.ApplicationClass();
appExcel.Visible = true;
newWorkbook_First = appExcel.Workbooks.Add(1);
objsheet = (Microsoft.Office.Interop.Excel.Worksheet)newWorkbook_First.Sheets[1];
objsheet.Name = ("test");
var newSheet3 = (Microsoft.Office.Interop.Excel.Worksheet)appExcel.Worksheets.Add(Type.Missing, appExcel.Worksheets[appExcel.Worksheets.Count], 1, XlSheetType.xlWorksheet);
newSheet3.Name = "test2";
var newSheet2 = (Microsoft.Office.Interop.Excel.Worksheet)appExcel.Worksheets.Add(Type.Missing, appExcel.Worksheets[appExcel.Worksheets.Count], 1, XlSheetType.xlWorksheet);
newSheet2.Name = "test3";
}
catch (Exception e)
{
Console.Write("Error");
}
finally
{
}
}
}
It wont create excel2.xlsx on my desktop, why not?
Next in my main I am shouting excel_setValue this way:
excel_setValue("C", "hello", "");
This is the excel_setValue function:
static void excel_setValue(string cellname, string value, string color)
{
objsheet.get_Range(cellname).set_Value(Type.Missing, value);
if (kleur == "red")
{
objsheet.get_Range(cellname).Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Red);
}
}
How do I add the sheet to this? For exmaple: excel_setValue(cellname, value, color, sheetname)
Finally I do excel_close();
the excel_close function:
static void excel_close()
{
if (appExcel != null)
{
try
{
newWorkbook_First.Close();
System.Runtime.InteropServices.Marshal.ReleaseComObject(appExcel.ActiveWorkbook.ActiveSheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(appExcel.ActiveWorkbook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(appExcel);
appExcel = null;
objsheet = null;
}
catch (Exception ex)
{
appExcel = null;
Console.WriteLine("Unable to release the Object " + ex.ToString());
}
finally
{
GC.Collect();
}
}
}
It closes and ask me if I wanna save/not-save or cancel it. And it will save # documents with no errors given

I create my Excel like this worked fine for me!
You need to do the folowing in you code before the newWorkbook_First.close(); part:
newWorkbook_First.SaveAs(totalPath);
I hope this will help you solve the problems..
using Excel = Microsoft.Office.Interop.Excel;
internal static bool ExportDGV(DataGridView DGV, List<string> selectedCustomerList, string path, string fileName, string exportName, int exportType, string mailSubject)
{
string totalPath;
//Create an Excel application instance
Excel.Application excelApp = new Excel.Application();
Excel.Workbook excelWorkBook = excelApp.Application.Workbooks.Add();
Excel._Worksheet worksheet = null;
excelApp.Visible = false;
worksheet = excelWorkBook.ActiveSheet;
//set headers
for (int i = 1; i < DataGridView.Columns.Count + 1; i++)
{
worksheet.Cells[1, i] = DGV.Columns[i - 1].HeaderText;
}
createList(worksheet, DGV);
//Create excel with the choosen name
Worksheet sheet1 = excelWorkBook.Worksheets[1];
worksheet.Name = fileName;
totalPath = path + "/" + fileName + ".xlsx";
//if path exist add a number
totalPath = directoryExist(totalPath, path, fileName);
//Save exel and Quit exelApp
excelWorkBook.SaveAs(totalPath);
excelWorkBook.Close();
excelApp.Quit();
}

You can use EpPlus library for excel. It is very easy to use and well documented. You don't need to use COM classes anymore