C#: some of machines are throwing following error: Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass'

Question

我创建了一个 C# function ，它将DataGridView保存到 Excel ，它适用于大多数机器。 但是，有些机器会抛出以下错误：

Microsoft.Office.Interop.Excel._Application. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000208D5-0000-0000-C000-000000000046}' failed due to the following error: Library not registered. (Exception from HRESULT 0x8002801D (TYPE_E_LIBNOTREGISTERED)).

有什么办法可以解决这个问题吗？

这是我的源代码：

private bool dataGridView_ExportToExcel(string fileName, DataGridView dgv, string ext, bool chart)
{
    CheckForIllegalCrossThreadCalls = false;
    Excel.Application excelApp = new Excel.Application();

    if (excelApp == null)
    {
        MessageBox.Show("No Excel has been installed!");
        return false;
    }

    Excel.Workbook wb = excelApp.Workbooks.Add(true);
    Excel._Worksheet workSheet = wb.Worksheets.get_Item(1) as Excel._Worksheet;
    workSheet.Name = "C#";

    // Print Contents
    for (int r = 0; r < dgv.Rows.Count; r++)
    {
        for (int i = 0; i < dgv.Columns.Count; i++)
        {
            workSheet.Cells[r + 2, i + 1] = dgv.Rows[r].Cells[i].Value;
        }
    }

    workSheet.Columns.AutoFit();
    wb.SaveAs(fileName, Excel.XlFileFormat.xlOpenXMLWorkbook, Type.Missing, Type.Missing, false, false, Excel.XlSaveAsAccessMode.xlNoChange, Excel.XlSaveConflictResolution.xlUserResolution, true, Type.Missing, Type.Missing, Type.Missing);

    wb.Close(Type.Missing, Type.Missing, Type.Missing);
    excelApp.Quit();
    releaseObject(excelApp);
    releaseObject(workSheet);
    releaseObject(wb);

    return true;
}

我正在使用.NET framework 4.6.1环境。

感谢您的阅读。 祝你今天过得愉快：）

Answer 1

windows 注册表项中似乎缺少一些内容，

这可能在 MS Excel 降级时发生。

要解决此问题，请 go 注册并删除 [HKEY_CLASSES_ROOT-->TypeLib-->{00020813-0000-0000-C000-000000000046} --> 1.9]

看看这是否有效。