I am trying to read an excel file and convert the contents of the file to a datatable but I keep getting this exception IErrorInfo.GetDescription failed with E_FAIL(0x80004005) pointing at a specific line POCCommand.Fill(dt);This is what I tried so far. What could I be doing wrong ?
string POCpath = #"p.xlsx";
string POCConnection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + POCpath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=1\";";
OleDbConnection POCcon = new OleDbConnection(POCConnection);
OleDbCommand POCcommand = new OleDbCommand();
DataTable dt = new DataTable();
OleDbDataAdapter POCCommand = new OleDbDataAdapter("select * from [Sheet1$] ", POCcon);
POCCommand.Fill(dt);
Console.WriteLine(dt.Rows.Count);
First, since you're using .NET, you need to wrap anything that inherits or implements from IDisposable into a using statement.
such as:
using (OleDbConnection connection = new OleDbConnection("connectionstring")){
//Do stuff here
}
Second:
Please refer to this great answer by MethodMan on this SO Answer.
It has everything you will need to know. He does both OleDb connections and a TextFieldParser which will be faster and less expensive.
Related
I'm getting the following error when trying to read an Excel file using a third-party component
Format of the initialization string does not conform to the OLE DB specification
Now, I know the words "third party component" are going to set off alarm bells here, but hear me out.
Here's the connection string I'm using
Provider=Microsoft.ACE.OLEDB.12.0;
Data Source=C:\users\rory\downloads\testdb_4.xls;
Extended Properties='Excel 8.0;HDR=YES;';
I've got this exact connection string to work no problem with the following C# code
using (OleDbConnection conn = new OleDbConnection())
{
DataTable dt = new DataTable();
conn.ConnectionString = connstring;
using (OleDbCommand comm = new OleDbCommand())
{
comm.CommandText = "select * from [TEST_DB$]";
// TEST_DB is the name of the sheet
comm.Connection = conn;
using (OleDbDataAdapter da = new OleDbDataAdapter())
{
da.SelectCommand = comm;
da.Fill(dt);
// do stuff with dt
}
}
}
This works as expected, and the datatable is filled with data from the Excel file. However when I try to access it from the component, I get the error above.
I'm not an expert on OLE DB, but I was under the impression that the drivers are at the OS level and if they work for one app / connection string they should work for all apps with that same connection string. Am I wrong? And if so, does anyone have a clue what's going on here?
I have contacted support for the component.
The solution to this ended up being to replace the single quotes with escaped doubles.
string conn = "Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source=C:\users\rory\downloads\testdb_4.xls;" +
"Extended Properties='Excel 8.0;HDR=YES;'"; // single quotes
became
string conn = "Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source=C:\users\rory\downloads\testdb_4.xls;" +
"Extended Properties=\"Excel 8.0;HDR=YES;\""; // escaped double quotes
OleDbConnection had no problem with single quotes but apparently some apps and components do.
I'm trying to access a .xlsx file which I want to read and I'm doing it like that :
protected void btnImportList_Click(object sender, EventArgs e) {
string connnection = #"Provider=Microsoft.ACE.OLEDB.12.0;DataSource=C:\Users\Karl\Desktop\NESR data\Autoload Sample - Goals.xlsx;Extended Properties=\Excel 12.0 xml;HDR=YES;IMEX=1\;";
OleDbConnection con = new OleDbConnection(connnection);
OleDbCommand command = new OleDbCommand();
DataTable dt = new DataTable();
OleDbDataAdapter myCommand = new OleDbDataAdapter("select * from [DL JV + VS Final$]", con);
myCommand.Fill(dt);
Console.Write(dt.Rows.Count);
}
However, I'm getting the following error message :
Could not find installable ISAM
I installed the Microsoft AccessDatabase Manager as it was said on the internet but I'm still trying to figure out what more I can do to fix that. Any idea?
Use the below connection string,
string connnection = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Karl\Desktop\NESR data\Autoload Sample - Goals.xlsx; Extended Properties=Excel 12.0;"
There should be a space between 'Data' and 'Source' and removed HDR=YES, IMEX=1.
I've been doing research on this problem for about a day and a half and haven't found a solution to my problem yet. This is my scenario:
I have a AsyncFileUpload and a button which is configured to accept only xls and xlsx files (Excel) file. This file that is uploaded is used to import information into a gridview. The old format xls files works fine. The problem comes when I want to upload the xlsx file. I've tested multiple scenarios and I have found that it works perfectly when the xlsx file is currectly/actively open. When it is closed it gives me errors. I have fiddled and explored solutions to this problem and the range of errors I have received is quite large. But the most prominent errors where the following:
1. External table is not in the expected format.
2. could-not-find-installable-isam
I have found an article relating to the second error (Could not find installable ISAM) but I haven't tried all the suggested solutions yet because I would rather avoid making changes to the windows registry because I do not have exstensive knowledge regarding this matter.
I'm attaching the code that I use to make the connection between the OleDb and the excel file:
protected void AsyncUpload_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
string connString = "";
string strFileType = Path.GetExtension(e.FileName).ToLower();
string path = e.FileName;
////Connection String to Excel Workbook
if (strFileType.Trim() == ".xls")
{
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
}
else if (strFileType.Trim() == ".xlsx")
{
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;HDR=Yes;IMEX=1";
}
string query = "SELECT * FROM [sheet1$]";
OleDbConnection conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed)
conn.Open();
OleDbCommand cmd = new OleDbCommand(query, conn);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
using (OleDbDataReader dr = cmd.ExecuteReader())
{
_InsertWrapper.clearLists();
while (dr.Read())
{
var row1Col0 = dr[0];
Console.WriteLine(row1Col0);
_InsertWrapper.GenerateList(dr);
}
}
da.Dispose();
conn.Close();
conn.Dispose();
InventoryGrid.DataBind();
ErrorsGrid.DataBind();
}
If someone has additional knowledge or an explanation that can contribute please add it so that more people that are struggling with the same type of problem can gain as much information from this question as possible.We are all still learning.
So, main idea: Need to find a solution to successfully upload the xlsx file
Try using third party tools. They work efficiently:
http://code.google.com/p/excellibrary/
I am trying to update some data in an Excel sheet of the format "xlsx" using OLEDB connection, but I am unable to make out the connection establishment.
Here is my code:
String sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source='" + "D:\abc1.xlsx" + "';Extended Properties='Excel 8.0;HDR=Yes'";
OleDbConnection con = new OleDbConnection(sConnectionString);
con.Open();
OleDbCommand com = new OleDbCommand("select * from Sheet1",con);
OleDbDataReader reader = null;
reader = com.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(reader[0]);
}
con.Open();
Console.ReadLine();
}
When I run the code, I'm facing the following exception:
The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local
machine.
Any idea how to recover from this exception or any other suggestions from which i can update my data in excel is advisable.
This could be the provider you have stated try changing it to the one which matches the Excel version on your machine
Try
Provider=Microsoft.ACE.OLEDB.12.0;Data Source='D:\abc1.xlsx';Extended Properties="Excel 12.0 Xml;HDR=YES";
Instead
Could also be that excel isnt installed
Also check that you have referenced the OLEDB library for your project
Change your PlatformTarget Type from AnyCPU to X86.
Steps:
Goto Project Properties.
Select Build tab.
Select X86 from PlatformTarget options.
It is possible that there are multiple reasons for this exception.
1) You could use the OleDbEnumerator class to find out what providers are available.
Accordingly you set your connection string.
2) Before that just try out below connection string.
String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + "D:\abc1.xlsx" + "';Extended Properties='Excel 8.0;HDR=Yes'";
3) If you have a 64 bit OS, there is no 64-bit version of the JET provider available and there's no alternative. As long as you want to support JET, you'll need to set the build target to x86.
first save as your excel workbook as Excel 97-2003 Workbook
It will work in my project...
string filepath = Server.MapPath("~/ImportData/") + fileUpload.FileName;
OleDbConnection oconn = new OleDbConnection
(#"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";
Extended Properties=Excel 8.0");`
oconn.Open();
OleDbDataAdapter adp = new OleDbDataAdapter("select * from Sheet1", oconn);
DataSet ds = new DataSet();
adp.Fill(ds);
oconn.Close();`
I have an xls file i would like to read using c# and populate the information in a data table. The code I am using is :
public static DataTable GetExcelData(string excelFilePath)
{
OleDbConnection objConn = null;
string oledbConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excelFilePath + ";Extended Properties=Excel 10.0;";
objConn = new OleDbConnection(oledbConnectionString);
if (objConn.State == ConnectionState.Closed)
{
objConn.Open();
}
var objCmdSelect = new OleDbCommand("Select * from [Sheet1$]", objConn);
var objAdapter = new OleDbDataAdapter();
objAdapter.SelectCommand = objCmdSelect;
var objDataset = new DataSet();
objAdapter.Fill(objDataset, "ExcelDataTable");
objConn.Close();
return objDataset.Tables[0];
}
Once this data table is populated, I need to remove the first 5 or so rows which contain header information, and loop through the data table populating an access database table. I have had no luck with this or any of the other 10,000 ways suggested. Does anyone have any information that can help me. I am running VS2010 .net 4.0 framework. Any and all help would be super appreciated.
Thanks,
John
I've had a great deal of trouble trying to get Excel data into a DataTable using OLEDB. I finally solved the issue by switching to a solution that uses Excel Interop. Please see this answer for further explanation and sample code:
Importing from Excel: some cells become null