将datagridview导出到excel工作表时出错答案

【问题标题】：error when export datagrid view to excel sheet将datagridview导出到excel工作表时出错
【发布时间】：2011-03-03 10:05:04
【问题描述】：

我在寡妇应用程序中有数据网格视图，我添加了将数据导出到 Excel 工作表的按钮，但这些出现了

Cannot implicitly convert type 'object' to 'Microsoft.Office.Interop.Excel._Worksheet'. An explicit conversion exists (are you missing a cast?) here ( worksheet = workbook.Sheets["Sheet1"];)

这里出现了这个错误（“SaveAs”方法没有重载需要“11”个参数）

workbook.SaveAs("c:\\output.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing)

这个错误出现了

我的代码：

Old format or invalid type library. (Exception from HRESULT: 0x80028018 (TYPE_E_INVDATAREAD)
private void button1_Click(object sender, EventArgs e)
{
    // creating Excel Application 
    Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
    // creating new WorkBook within Excel application 
    Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);
    // creating new Excelsheet in workbook 
    Microsoft.Office.Interop.Excel._Worksheet worksheet = null;
    // see the excel sheet behind the program 
    app.Visible = true;
    // get the reference of first sheet. By default its name is Sheet1. 
    // store its reference to worksheet 
    worksheet = workbook.Sheets["Sheet1"];
    worksheet = workbook.ActiveSheet;
    // changing the name of active sheet 
    worksheet.Name = "Exported from gridview";

    // storing header part in Excel 

    for (int i = 1; i < DGData.Columns.Count + 1; i++)
    {
        worksheet.Cells[1, i] = DGData.Columns[i - 1].HeaderText;
    }
    // storing Each row and column value to excel sheet 

    for (int i = 0; i < DGData.Rows.Count - 1; i++)
    {
        for (int j = 0; j < DGData.Columns.Count; j++)
        {
            worksheet.Cells[i + 2, j + 1] = DGData.Rows[i].Cells[j].Value.ToString();
        }
    }
    // save the application 

    workbook.SaveAs("c:\\output.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

    // Exit from the application 
    app.Quit();
    // storing Each row and column value to excel sheet 

    for (int i = 0; i < DGData.Rows.Count - 1; i++)
    {
        for (int j = 0; j < DGData.Columns.Count; j++)
        {
            worksheet.Cells[i + 2, j + 1] = DGData.Rows[i].Cells[j].Value.ToString();
        }
    }
}

【问题讨论】：

您不应该使用 Office Interop 来根据 Microsoft 的建议从 Web 应用程序生成 excel，无论是出于法律原因还是线程原因。请改用 epplus.codeplex.com 之类的托管方式。

标签： c# excel datagridview

【解决方案1】：

不要忘记转换，因为 workbook.Sheets[] 和 workbook.ActiveSheet 返回对象类型：

worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets["Sheet1"];
worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.ActiveSheet;

您的 SaveAs 方法需要一个额外的“缺失”：

workbook.SaveAs("c:\\output.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

关于“旧格式或无效类型库”错误，请参阅this Microsoft article 以获得解决方法。

【讨论】：