C#: How to access an Excel cell? - c#

I am trying to open an Excel file and populate its cells with data? I have done the following coding so far.
Currently I am at this stage with the following code but still I am getting errors:
Microsoft.Office.Interop.Excel.ApplicationClass appExcel =
new Microsoft.Office.Interop.Excel.ApplicationClass();
try
{
// is there already such a file ?
if (System.IO.File.Exists("C:\\csharp\\errorreport1.xls"))
{
// then go and load this into excel
Microsoft.Office.Interop.Excel.Workbooks.Open(
"C:\\csharp\\errorreport1.xls", true, false,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value);
}
else
{
// if not go and create a workbook:
newWorkbook = appExcel.Workbooks.Add(XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel._Worksheet excelWorksheet =
(Microsoft.Office.Interop.Excel._Worksheet)
newWorkBook.Worksheets.get_Item(1);
}
i++;
j = 1;
j++;
objsheet.Cells(i, j).Value = "Tabelle: " + rs.Fields["Table_Name"];
j++;
objsheet.Cells(i, j).Value = "kombinationsschluessel:FALL "
+ rs3.Fields[1].Value;
j++;
objsheet.Cells(i, j).Value = "Null Value: ";
j++;
objsheet.Cells(i, j).Value = "Updated with 888";
These are the top 2 errors I am getting:
Error 1 An object reference is required for the nonstatic field, method, or
property 'Microsoft.Office.Interop.Excel.Workbooks.Open(string, object,
object, object, object, object, object, object, object, object, object,
object, object, object, object)'
Error 2 The name 'newWorkbook' does not exist in the current context

If you are trying to automate Excel, you probably shouldn't be opening a Word document and using the Word automation ;)
Check this out, it should get you started,
http://www.codeproject.com/KB/office/package.aspx
And here is some code. It is taken from some of my code and has a lot of stuff deleted, so it doesn't do anything and may not compile or work exactly, but it should get you going. It is oriented toward reading, but should point you in the right direction.
Microsoft.Office.Interop.Excel.Worksheet sheet = newWorkbook.ActiveSheet;
if ( sheet != null )
{
Microsoft.Office.Interop.Excel.Range range = sheet.UsedRange;
if ( range != null )
{
int nRows = usedRange.Rows.Count;
int nCols = usedRange.Columns.Count;
foreach ( Microsoft.Office.Interop.Excel.Range row in usedRange.Rows )
{
string value = row.Cells[0].FormattedValue as string;
}
}
}
You can also do
Microsoft.Office.Interop.Excel.Sheets sheets = newWorkbook.ExcelSheets;
if ( sheets != null )
{
foreach ( Microsoft.Office.Interop.Excel.Worksheet sheet in sheets )
{
// Do Stuff
}
}
And if you need to insert rows/columns
// Inserts a new row at the beginning of the sheet
Microsoft.Office.Interop.Excel.Range a1 = sheet.get_Range( "A1", Type.Missing );
a1.EntireRow.Insert( Microsoft.Office.Interop.Excel.XlInsertShiftDirection.xlShiftDown, Type.Missing );

I think, that you have to declare the associated sheet!
Try something like this
objsheet(1).Cells[i,j].Value;

How I work to automate Office / Excel:
Record a macro, this will generate a VBA template
Edit the VBA template so it will match my needs
Convert to VB.Net (A small step for men)
Leave it in VB.Net, Much more easy as doing it using C#

Try:
Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;
Excel.Range oRng;
oXL = new Excel.Application();
oXL.Visible = true;
oWB = (Excel._Workbook)(oXL.Workbooks.Add(Missing.Value));
oSheet = (Excel._Worksheet)oWB.Worksheets;
oSheet.Activate();
oSheet.Cells[3, 9] = "Some Text"

Simple.
To open a workbook.
Use xlapp.workbooks.Open()
where you have previously declared and instanitated xlapp as so..
Excel.Application xlapp = new Excel.Applicaton();
parameters are correct.
Next make sure you use the property Value2 when assigning a value to the cell using either the cells property or the range object.

This works fine for me
Excel.Application oXL = null;
Excel._Workbook oWB = null;
Excel._Worksheet oSheet = null;
try
{
oXL = new Excel.Application();
string path = #"C:\Templates\NCRepTemplate.xlt";
oWB = oXL.Workbooks.Open(path, 0, false, 5, "", "",
false, Excel.XlPlatform.xlWindows, "", true, false,
0, true, false, false);
oSheet = (Excel._Worksheet)oWB.ActiveSheet;
oSheet.Cells[2, 2] = "Text";

You can use the below code; it's working fine for me:
newWorkbook = appExcel.Workbooks.Add();

Related

C# excel interop cut and paste exception

I’m working on a project and I’ve ran into an exception that I don’t know how to fix. I’ve searched everywhere and can’t find a solution that helps.
I’m trying to cut a range on a spreadsheet that has found a specific value in a cell in Column A and paste the entire row of that specific value into a new spreadsheet starting from A2 and until the value is no longer found in the original spreadsheet.
My code currently pastes one row in the new spreadsheet then gives me this exception “The information cannot be pasted because the Cut area and the paste area are not the same size and shape.” The exception is happening at this point in the code;
Excel.Range from = currentFind.EntireRow;
Excel.Range to = oSheet.get_Range("A2:A2500");
I think I need to use the active cell and active sheet properties.
Please help me!
public void btnLoad_Click(object sender, EventArgs e)
{
Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;
if (dmCheck.IsChecked == true && fldCheck.IsChecked == true)
{
oXL = new Excel.Application();
oXL.Visible = true;
oWB = (Excel._Workbook)(oXL.Workbooks.Add());
oSheet = (Excel._Worksheet)oWB.ActiveSheet;
string dXLPath = #"N:/DAILY2.xlsx";
Excel.Workbook dWB = oXL.Workbooks.Open(dXLPath);
Excel.Worksheet dSheet = dWB.Worksheets.get_Item(1);
Excel.Range dRng = dSheet.get_Range("B1");
dRng.EntireColumn.Hidden = true;
Excel.Range currentFind = null;
Excel.Range firstFind = null;
Excel.Range taskHazpoi = dSheet.get_Range("A2", "A2500");
currentFind = taskHazpoi.Find("HAZPOI", Type.Missing, Excel.XlFindLookIn.xlValues, Excel.XlLookAt.xlPart, Excel.XlSearchOrder.xlByRows, Excel.XlSearchDirection.xlNext, false, Type.Missing, Type.Missing);
while(currentFind != null)
{
if (firstFind == null)
{
firstFind = currentFind;
}
else if (currentFind.get_Address(Excel.XlReferenceStyle.xlA1) == firstFind.get_Address(Excel.XlReferenceStyle.xlA1))
{
break;
}
Excel.Range from = currentFind.EntireRow;
Excel.Range to = oSheet.get_Range("A2:A2500");
from.Cut(to);
currentFind = taskHazpoi.FindNext(currentFind);
}
else if (dmCheck.IsChecked == false && fldCheck.IsChecked == false)
{
MessageBox.Show("Please check the DM and Flood box", "Report Loader");
}
I recommend you use Epplus instead of the interop Excel (i used it).
Advantages:
No requires office package installed in system.
No instance of Excel in memory.
Methods more clear.
Example of use:
http://zeeshanumardotnet.blogspot.com.es/2011/06/creating-reports-in-excel-2007-using.html?m=1
You found it in Nuget.
Regards,
You try to copy an entire row into the cell area A2:A2500, that's what triggers the exception.
For the 'to' range, take oSheet.get_Range("A2").EntireRow or oSheet.get_Range("A:A").

Append three columns in the Excel

I copy the data from one location to another and am able to read and print all values. But not able to append the column in the Excel file. I need to Append three columns in the beginning (Ex: 'A').
private void btnUpload_Click(object sender, RoutedEventArgs e)
{
ApplicationClass app = new ApplicationClass();
Workbook book = null;
Worksheet sheet = null;
Range range = null;
try
{
app.Visible = false;
app.ScreenUpdating = false;
app.DisplayAlerts = false;
book = app.Workbooks.Open(#"C:\Windows\Temp\" + FileName, Missing.Value, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value, Missing.Value
, Missing.Value, Missing.Value, Missing.Value);
sheet = (Worksheet)book.Worksheets[1];
// get a range to work with
range = sheet.get_Range("A1", Missing.Value);
// get the end of values to the right (will stop at the first empty cell)
range = range.get_End(XlDirection.xlToRight);
// get the end of values toward the bottom, looking in the last column (will stop at first empty cell)
range = range.get_End(XlDirection.xlDown);
// get the address of the bottom, right cell
string downAddress = range.get_Address(
false, false, XlReferenceStyle.xlA1,
Type.Missing, Type.Missing);
// Get the range, then values from a1
range = sheet.get_Range("A1", downAddress);
object[,] values = (object[,])range.Value2;
// Value2 is a two dimenial array dime one = row, dime two = column.
Console.WriteLine("Col Count: " + values.GetLength(1).ToString());
Console.WriteLine("Row Count: " + values.GetLength(0).ToString());
Microsoft.Office.Interop.Excel.Range oRng = sheet.Range["A1"];
oRng.EntireColumn.Insert(Microsoft.Office.Interop.Excel.XlInsertShiftDirection.xlShiftToRight,
Microsoft.Office.Interop.Excel.XlInsertFormatOrigin.xlFormatFromRightOrBelow);
oRng = sheet.Range["A1"];
oRng.Value2 = "Discount";
Microsoft.Office.Interop.Excel.Range oRng = sheet.Range["B1"];
oRng.EntireColumn.Insert(Microsoft.Office.Interop.Excel.XlInsertShiftDirection.xlShiftToRight,
Microsoft.Office.Interop.Excel.XlInsertFormatOrigin.xlFormatFromRightOrBelow);
oRng = sheet.Range["B1"];
oRng.Value2 = "NOTHING";
Microsoft.Office.Interop.Excel.Range oRng = sheet.Range["C1"];
oRng.EntireColumn.Insert(Microsoft.Office.Interop.Excel.XlInsertShiftDirection.xlShiftToRight,
Microsoft.Office.Interop.Excel.XlInsertFormatOrigin.xlFormatFromRightOrBelow);
oRng = sheet.Range["C1"];
oRng.Value2 = "HELLO";
}
catch (Exception k)
{
Console.WriteLine(k);
}
finally
{
range = null;
sheet = null;
if (book != null)
book.Close(false, Missing.Value, Missing.Value);
book = null;
if (app != null)
app.Quit();
app = null;
MessageBox.Show("File Uploaded Successfully. Please Wait...!");
}
}
You only need to set the value of the cell. Don't use "A1" as cell because you need the column number: A is the first letter, so it needs to be column 1 and B is the second letter, needs to be column 2 etc. In the following code you can see how to do it correctly:
Excel.Application app = new Excel.Application();
Excel.Workbooks workbooks = app.Workbooks;
string filename = #"yourFilename";
workbooks.Open(filename);
Excel.Workbook workbook = workbooks.Item[1];
Excel.Sheets worksheets = workbook.Worksheets;
Excel.Worksheet worksheet = worksheets.Item[1];
Excel.Range cells = worksheet.UsedRange;
cells[1, 2] = "Hello";//Set value for row 1 and column 2 (A1)
cells[1, 3] = "World";//Set value for row 1 and column 3 (B1)
workbook.Save();//Save Excel-File
app.Quit();
Console.ReadKey();

C# Struggling to read excel data into arrays (interop)

First off I apologize I have asked this before but I never got an answer for it due to posting at quiet time of day.
I'm trying to read data from an xlsx document columns into array lists on a form based program so I can then call in various bits of data to manipulate or simply show onscren but can't get some code to work. I searched the forums and found this which according to the poster works but I'm having problems. I'm literally stuck on the matter as I've never had to write any code that involved excel.
The errors it throws are the words "Server, Missing & session" do not exist in the current context. I'm aware session isn't part of the winforms applications but dont know what to do about it.
using Microsoft.Office.Interop.Excel;
This is the main code
string filePath = "SampleData.xlsx";
try
{
Excel.Application appExl;
Excel.Workbook workbook;
Excel.Worksheet NwSheet;
Excel.Range ShtRange;
appExl = new Excel.Application();
workbook = appExl.Workbooks.Open(filePath);
workbook = appExl.Workbooks.Open(Server.MapPath(filePath), Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1);
int Cnum = 0;
int Rnum = 0;
ShtRange = NwSheet.UsedRange;
DataTable dt = new DataTable();
for (int row = 1; row <= ShtRange.Rows.Count; row++)
{
string str = Convert.ToString((ShtRange.Cells[row, 1] as Excel.Range).Value2);
dt.Columns.Add(str);
}
workbook.Close(true);
appExl.Quit();
Session["data"] = dt;
return true;
}
catch (Exception ex)
{
return false;
}
Is this a better representation of what it should be like?
using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
string FilePath = "SampleData.xlsx";
Excel.Application appExl;
Excel.Workbook workbook;
Excel.Worksheet NwSheet;
Excel.Range ShtRange;
appExl = new Excel.Application();
workbook = appExl.Workbooks.Open(FilePath);
NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1);
int Cnum = 0;
int Rnum = 0;
ShtRange = NwSheet.UsedRange;
DataTable dt = new DataTable();
for (int row = 1; row <= ShtRange.Rows.Count; row++)
{
string str = Convert.ToString((ShtRange.Cells[row, 1] as Excel.Range).Value2);
dt.Columns.Add(str);
}
workbook.Close(true);
appExl.Quit();
I believe you need to add the following references to your project:
System.Web
System.Reflection
You may also need to add the following to your code:
Using System.Web
Using System.Reflection
If this is a Winforms application, you won't need the System.web reference and you'll need to replace 'Server.MapPath(filePath)' with a filepath Instead of 'Session["data"]' you will probably want to use a DataGrid.
Also looks like you are trying to open the file twice in succession. Not sure why.

Save DataTable data in Excel file asp.Net

I have a Gridview which i fill with a Datatable. On the webpage the user has to be able to download an excel file with the contents of the Gridview. So mi thought the easiest way to save the files is to save the datatable as an excel file. I have troied this method, which i found here on stackoverflow.
using Excel = Microsoft.Office.Interop.Excel;
public static bool ExportDataTableToExcel(DataTable dt, string filepath)
{
Excel.Application oXL;
Excel.Workbook oWB;
Excel.Worksheet oSheet;
Excel.Range oRange;
try
{
// Start Excel and get Application object.
oXL = new Excel.Application();
// Set some properties
oXL.Visible = true;
oXL.DisplayAlerts = false;
// Get a new workbook.
oWB = oXL.Workbooks.Add(Missing.Value);
// Get the Active sheet
oSheet = (Excel.Worksheet)oWB.ActiveSheet;
oSheet.Name = "Data";
int rowCount = 1;
foreach (DataRow dr in dt.Rows)
{
rowCount += 1;
for (int i = 1; i < dt.Columns.Count + 1; i++)
{
// Add the header the first time through
if (rowCount == 2)
{
oSheet.Cells[1, i] = dt.Columns[i - 1].ColumnName;
}
oSheet.Cells[rowCount, i] = dr[i - 1].ToString();
}
}
// Resize the columns
oRange = oSheet.get_Range(oSheet.Cells[1, 1],
oSheet.Cells[rowCount, dt.Columns.Count]);
oRange.EntireColumn.AutoFit();
// Save the sheet and close
oSheet = null;
oRange = null;
oWB.SaveAs(filepath, Excel.XlFileFormat.xlWorkbookNormal,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Excel.XlSaveAsAccessMode.xlExclusive,
Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value);
oWB.Close(Missing.Value, Missing.Value, Missing.Value);
oWB = null;
oXL.Quit();
}
catch
{
throw;
}
finally
{
// Clean up
// NOTE: When in release mode, this does the trick
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
return true;
}
Bu i get a build error stating that "The name Missing does not exist in the current context" and i cant seem to figure out why? can anyone help ?
the code is pasted from this stackoverflow page here
According to msdn here, Missing.Value is defined in System.Reflection. You should add a reference to this namespace.
using System.Reflection;

How to export excel from dataset or datatable in c#?

I want to export data from Dataset or Data Table to Excel file in C# without using Gridview.
I would recommend EPPlus - this solution doesn't require COM nor interop dlls and is very fast. Perfectly suited for web scenarios.
http://epplus.codeplex.com/
http://nuget.org/packages/EPPlus
private void DumpExcel(DataTable tbl)
{
using (ExcelPackage pck = new ExcelPackage())
{
//Create the worksheet
ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Demo");
//Load the datatable into the sheet, starting from cell A1. Print the column names on row 1
ws.Cells["A1"].LoadFromDataTable(tbl, true);
//Format the header for column 1-3
using (ExcelRange rng = ws.Cells["A1:C1"])
{
rng.Style.Font.Bold = true;
rng.Style.Fill.PatternType = ExcelFillStyle.Solid; //Set Pattern for the background to Solid
rng.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(79, 129, 189)); //Set color to dark blue
rng.Style.Font.Color.SetColor(Color.White);
}
//Example how to Format Column 1 as numeric
using (ExcelRange col = ws.Cells[2, 1, 2 + tbl.Rows.Count, 1])
{
col.Style.Numberformat.Format = "#,##0.00";
col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
}
//Write it back to the client
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment; filename=ExcelDemo.xlsx");
Response.BinaryWrite(pck.GetAsByteArray());
}
}
}
}
Get more ways : 9 Solutions to Export Data to Excel for ASP.NET
I have this code but for this you need to include Excel Com Component
Add reference of Microsoft.Office.Interop.Excel.dll in your project will do task for you.
using Excel = Microsoft.Office.Interop.Excel;
public static bool ExportDataTableToExcel(DataTable dt, string filepath)
{
Excel.Application oXL;
Excel.Workbook oWB;
Excel.Worksheet oSheet;
Excel.Range oRange;
try
{
// Start Excel and get Application object.
oXL = new Excel.Application();
// Set some properties
oXL.Visible = true;
oXL.DisplayAlerts = false;
// Get a new workbook.
oWB = oXL.Workbooks.Add(Missing.Value);
// Get the Active sheet
oSheet = (Excel.Worksheet)oWB.ActiveSheet;
oSheet.Name = "Data";
int rowCount = 1;
foreach (DataRow dr in dt.Rows)
{
rowCount += 1;
for (int i = 1; i < dt.Columns.Count + 1; i++)
{
// Add the header the first time through
if (rowCount == 2)
{
oSheet.Cells[1, i] = dt.Columns[i - 1].ColumnName;
}
oSheet.Cells[rowCount, i] = dr[i - 1].ToString();
}
}
// Resize the columns
oRange = oSheet.get_Range(oSheet.Cells[1, 1],
oSheet.Cells[rowCount, dt.Columns.Count]);
oRange.EntireColumn.AutoFit();
// Save the sheet and close
oSheet = null;
oRange = null;
oWB.SaveAs(filepath, Excel.XlFileFormat.xlWorkbookNormal,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Excel.XlSaveAsAccessMode.xlExclusive,
Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value);
oWB.Close(Missing.Value, Missing.Value, Missing.Value);
oWB = null;
oXL.Quit();
}
catch
{
throw;
}
finally
{
// Clean up
// NOTE: When in release mode, this does the trick
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
return true;
}
you can use
using Microsoft.Office.Interop.Excel;
to work with excel documents "native"...
Using C# to Create an Excel Document
http://www.codeproject.com/Articles/20228/Using-C-to-Create-an-Excel-Document
But most of the common report Generator/Designers can easily export to excel
also check for Reporting Services if you are using SQL SERVER
Just in case somebody else used the chosen solution and run into the "object does not contain a definition for get_Range" exception. I found the solution here: Worksheet get_Range throws exception. I hope this will save your time.

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