Can't find referenced sheet in excel file while trying to read from a webpage in VB.Net

问题

I'm trying to build a webpage that allows a user to choose an excel file and then the page will read the contents of the page and upload the data to the DB after validation.

I have a fileUpload asp control with a button for execution and a gridview to display the data. This isn't the end-goal, but I have it simply to test if the script is reading the file successfully (which it isn't).

The error I keep getting is:

"The Microsoft Office Access database engine could not find the object 'Sheet1'. Make sure the object exists and that you spell its name and the path name correctly."

The excel file I upload definitely has a Sheet1, so I'm not sure what's going on.

I won't pretend to have a lot of experience or understanding as how OleDB works, so I'm sure it's something simple.

My Code is as follows:

Protected Sub Upload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Upload.Click
    If (testFile.HasFile) Then
        Dim conn As OleDbConnection
        Dim cmd As OleDbCommand
        Dim da As OleDbDataAdapter
        Dim ds As DataSet
        Dim query As String
        Dim connString As String = ""
        Dim strFileType As String = System.IO.Path.GetExtension(testFile.FileName).ToString().ToLower()

        'Check file type
        If strFileType.Trim = ".xls" Or strFileType.Trim = ".xlsx" Then
        Else
            MsgBox("Only excel files allowed")
            Exit Sub
        End If

        Try
            'Connection String to Excel Workbook
            If strFileType.Trim = ".xls" Then
                connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & testFile.FileName & ";Extended Properties=""Excel 8.0;HDR=Yes;IMEX=2"""
            ElseIf strFileType.Trim = ".xlsx" Then
                connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & testFile.FileName & ";Extended Properties=""Excel 12.0;HDR=Yes;IMEX=2"""
            End If

            query = "SELECT * FROM [Sheet1$]"

            'Create the connection object
            conn = New OleDbConnection(connString)
            'Open connection
            If conn.State = ConnectionState.Closed Then conn.Open()
            'Create the command object
            cmd = New OleDbCommand(query, conn)
            da = New OleDbDataAdapter(cmd)
            ds = New DataSet()
            da.Fill(ds)

            grvExcelData.DataSource = ds.Tables(0)
            grvExcelData.DataBind()

            da.Dispose()
            conn.Close()
            conn.Dispose()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    Else
        MsgBox("Must have file")
        Exit Sub
    End If
End Sub

I'd also appreciate a good resource on how to learn more about OleDB along with the specifics errors of my code!

Thanks!

回答1:

You need to create an output to view the sheets from the page, perhaps in a DropDownList object (this code is a little ugly, but should point you in the right direction). Basically return your sheets first to verify it exists...

 private void ProcessExcelFile(string fileName, bool isOpenXMLFormat)
    {
        string fn = System.IO.Path.GetFileName(fileName);
        String RelativePath = "YourPath/" + fn;
        string connectionString = String.Empty;
        OleDbConnection con;

        if (isOpenXMLFormat)
            //read a 2007 file  
            connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
                fileName + ";Extended Properties=\"Excel 8.0;HDR=YES;\"";
        else
            //read a 97-2003 file  
            connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
                fileName + ";Extended Properties=Excel 8.0;";

        con = new OleDbConnection(connectionString);
        con.Open();

        //get all the available sheets  
        System.Data.DataTable dataSet = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

        //get the number of sheets in the file  
        string[] workSheetNames = new String[dataSet.Rows.Count];
        int i = 0;
        foreach (DataRow row in dataSet.Rows)
        {
            //insert the sheet's name in the current element of the array  
            //and remove the $ sign at the end  
            //workSheetNames[i] = row["TABLE_NAME"].ToString().Trim(new[] { '$' });
            workSheetNames[i] = row["TABLE_NAME"].ToString();
            i++;
        }
        SheetNames.DataSource = workSheetNames;
        SheetNames.DataBind();

来源：https://stackoverflow.com/questions/15412936/cant-find-referenced-sheet-in-excel-file-while-trying-to-read-from-a-webpage-in