DataGridViewS 导出到 excel sheetS

Question

我想将所有 DataGridView 导出到一个 Excel 文档中。对于每个 DataGridView，Excell 文件中都应该有自己的 sheet。

但是我的代码只收到错误：System.Runtime.InteropServices.COMException: HRESULT: 0x800A03EC"

我认为我的参数有问题。

        private void exportToExcellButton_Click(object sender, EventArgs e)
    {
        SaveFileDialog saveFileD = new SaveFileDialog();
        string fileName = truckListBox.SelectedItem.ToString() + "__" + DateTime.Now.ToShortDateString();
        saveFileD.InitialDirectory = @"C:/TML/";
        saveFileD.FileName = fileName;

        if (!Directory.Exists(@"C:/TML/"))

            Directory.CreateDirectory(@"C:/TML/");

        List<DataGridView> dataGridViews = getAllDataGridViews();

        Microsoft.Office.Interop.Excel.Application app;
        Microsoft.Office.Interop.Excel.Workbook book;
        Microsoft.Office.Interop.Excel.Worksheet sheet;

        app = new Excel.Application();
        app.Visible = true;
        book = app.Workbooks.Add(System.Reflection.Missing.Value);

        foreach (var grid in dataGridViews)
        {
          int count = book.Worksheets.Count;
          sheet = (Worksheet)book.Sheets.Add(Type.Missing, book.Worksheets[count], Type.Missing, Type.Missing);
            sheet.Name = grid.Name.ToString().Remove(0, 13);

            int cMin = 0, rMin = 0;
            int c = cMin, r = rMin;

            // Set Headers
            foreach (DataGridViewColumn column in grid.Columns)
            {
            //Here appears the Error: System.Runtime.InteropServices.COMException: HRESULT: 0x800A03EC"
                sheet.Cells[r, c] = column.HeaderText;
                c++;
            }

            sheet.Range[sheet.Cells[r, cMin], sheet.Cells[r, c]].Font.Bold = true;
            sheet.Range[sheet.Cells[r, cMin], sheet.Cells[r, c]].VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;

            // Set Rows
            foreach (DataGridViewRow row in grid.Rows)
            {
                r++;
                c = cMin;
                // Set Cells
                foreach (DataGridViewCell item in row.Cells)
                {
                    sheet.Cells[r, c++] = item.Value;
                }
            }
        }
        book.Save();
        book.Close();
        app.Quit();
    }

花了好几天的时间，却无法让它工作。感谢您的帮助！

编辑：修复了一个错误以获取新错误。

Answer 1

发布的代码可能存在一些问题。因此，我将分解它们。

首先，您似乎在使用 SaveFileDialog，但我看不到它的使用位置。该代码设置了 InitalDirectory 和 FileName，但从未使用过。这并不重要，因为实际上并不需要对话框，但是代码获取文件名的方式会有一些问题。代码行…

string fileName = truckListBox.SelectedItem.ToString() + "__" + DateTime.Now.ToShortDateString();

如果您尝试保存文件名，

将会遇到问题，因为从 DateTime.Now.ToShortDateString() 返回的字符串将采用类似“2019”的格式……显然是“\”字符将被解释为路径（文件夹），并且在代码尝试保存文件时很可能会失败。创建一个 returns 使用其他字符的字符串的方法应该很容易解决这个问题。

接下来是 Excel 文件根据其行和列不为零的事实。因此，设置初始 Excel 行列变量 (int c = 0, r = 0;) 将在第一次尝试时失败。这些值应该是一 (1)。

另一个问题在线...

book.Save();

很可能会使用“Book1.xlsx”的文件名将文件保存到用户的“Documents”文件夹中。保存文件时，您需要提供完整的路径和文件名，如前所述，这些文件名似乎未被使用。

最后，无论何时您使用“COM”对象，例如 Excel 应用程序、工作簿和工作表，在退出程序之前“释放”您的代码创建的 com 对象对于代码来说是非常重要的。在当前发布的代码中，极有可能仍有挥之不去的“Excel”资源运行。因此，为避免资源泄漏，您的代码释放它创建的 com 对象很重要。在我下面的示例中，释放资源的代码位于 try/catch/finally 语句的 finally 子句中。

private void button1_Click(object sender, EventArgs e) {
  //SaveFileDialog saveFileD = new SaveFileDialog();
  //string fileName = truckListBox.SelectedItem.ToString() + "__" + DateTime.Now.ToShortDateString();
  string fileName = @"C:\Users\John\Desktop\Grr\TestExcelFile" + "__" + DateTime.Now.Year + "_" + DateTime.Now.Month;

  //saveFileD.InitialDirectory = @"C:\Users\John\Desktop\Grr\";
  //saveFileD.FileName = fileName;

  //if (!Directory.Exists(@"C:/TML/"))

  //    Directory.CreateDirectory(@"C:/TML/");

  //List<DataGridView> dataGridViews = getAllDataGridViews();
  List<DataGridView> dataGridViews = getGrids();

  Microsoft.Office.Interop.Excel.Application app = null;
  Microsoft.Office.Interop.Excel.Workbook book = null;
  Microsoft.Office.Interop.Excel.Worksheet sheet = null;

  app = new Microsoft.Office.Interop.Excel.Application();
  app.Visible = true;
  book = app.Workbooks.Add(System.Reflection.Missing.Value);
  try {
    foreach (var grid in dataGridViews) {
      int count = book.Worksheets.Count;
      //sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.Sheets.Add(Type.Missing, book.Worksheets[count], Type.Missing, Type.Missing);
      sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.Worksheets.Add();
      //sheet.Name = grid.Name.ToString().Remove(0, 13);
      sheet.Name = grid.Name.ToString();

      int cMin = 1, rMin = 1;
      int c = cMin, r = rMin;

      // Set Headers
      foreach (DataGridViewColumn column in grid.Columns) {
        //Here appears the Error: System.Runtime.InteropServices.COMException: HRESULT: 0x800A03EC"
        sheet.Cells[r, c] = column.HeaderText;
        c++;
      }

      sheet.Range[sheet.Cells[r, cMin], sheet.Cells[r, c]].Font.Bold = true;
      sheet.Range[sheet.Cells[r, cMin], sheet.Cells[r, c]].VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;

      // Set Rows
      foreach (DataGridViewRow row in grid.Rows) {
        r++;
        c = cMin;
        // Set Cells
        foreach (DataGridViewCell item in row.Cells) {
          sheet.Cells[r, c++] = item.Value;
        }
      }
    }
    book.SaveAs(fileName, Type.Missing, Type.Missing, Type.Missing);
    book.Close();
    app.Quit();
  }
  catch (Exception ex) {
    MessageBox.Show("Error writing to excel: " + ex.Message);
  }
  finally {
    if (sheet != null)
      Marshal.ReleaseComObject(sheet);
    if (book != null)
      Marshal.ReleaseComObject(book);
    if (app != null)
      Marshal.ReleaseComObject(app);
  }
}

希望这对您有所帮助。

Answer 2

简单做一个方法，传DataGridView

using Excel = Microsoft.Office.Interop.Excel;
public void ete(DataGridView dgv)//ExportToExcel
    {
        // Creating a Excel object.

        Excel._Application excel = new Excel.Application();
        Excel._Workbook workbook = excel.Workbooks.Add(Type.Missing);
        Excel._Worksheet worksheet = null;
        excel.Columns.ColumnWidth = 20;

        try
        {

            worksheet = workbook.ActiveSheet;

            worksheet.Name = "ExportedFromDatGrid";

            int cellRowIndex = 1;
            int cellColumnIndex = 1;

            //Loop through each row and read value from each column.
            for (int i = -1; i < dgv.Rows.Count; i++)
            {
                for (int j = 0; j < dgv.Columns.Count; j++)
                {
                    // Excel index starts from 1,1. As first Row would have the Column headers, adding a condition check.
                    if (cellRowIndex == 1)
                    {
                        worksheet.Cells[cellRowIndex, cellColumnIndex] = dgv.Columns[j].HeaderText;
                    }
                    else
                    {
                        worksheet.Cells[cellRowIndex, cellColumnIndex] = dgv.Rows[i].Cells[j].Value.ToString();
                    }
                    cellColumnIndex++;
                }
                cellColumnIndex = 1;
                cellRowIndex++;
            }

            //Getting the location and file name of the excel to save from user.
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.Filter = "Excel files (*.xlsx)|*.xlsx|All files (*.*)|*.*";
            saveDialog.FilterIndex = 2;

            if (saveDialog.ShowDialog() == DialogResult.OK)
            {
                workbook.SaveAs(saveDialog.FileName.ToString());
                MessageBox.Show("Export Successful");
            }
        }
        catch (System.Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        finally
        {
            excel.Quit();
            workbook = null;
            excel = null;
        }

    }

现在调用方法

ete(datagridview1);

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