通过 mysql 导出 Gridview 数据获取答案

【问题标题】：Export Gridview data fetch by mysql通过 mysql 导出 Gridview 数据获取
【发布时间】：2016-06-22 06:04:47
【问题描述】：

您好，我将 gridview 数据导出到 excel 中，但不幸的是，导出文件中的数据不同，应该是数据表。

下面是我在导出按钮中的脚本，你能告诉我我的脚本有什么问题吗？我是 ASP.net 的新手，谢谢

try
{
    Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
    excel.Visible = true;
    Microsoft.Office.Interop.Excel.Workbook workbook = excel.Workbooks.Add(System.Reflection.Missing.Value);
    Microsoft.Office.Interop.Excel.Worksheet sheet1 = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets[1];
    int StartCol = 1;
    int StartRow = 1;
    int j = 0, i = 0;

    //Write Headers
    for (j = 0; j < GridView1.Columns.Count; j++)
    {
        Microsoft.Office.Interop.Excel.Range myRange = (Microsoft.Office.Interop.Excel.Range)sheet1.Cells[StartRow, StartCol + j];
        myRange.Value = GridView1.Columns[j].HeaderText;
    }

    StartRow++;

     //Write datagridview content
     for (i = 0; i < GridView1.Rows.Count; i++)
     {
         for (j = 0; j < GridView1.Columns.Count; j++)
         {
             try
             {
                 Microsoft.Office.Interop.Excel.Range myRange = (Microsoft.Office.Interop.Excel.Range)sheet1.Cells[StartRow + i, StartCol + j];
                 myRange.Value2 = GridView1.Rows[i].Cells[j].Text + ";" == null ? "" : GridView1.Rows[i].Cells[j].Text + ";";

             }
             catch
             {
                 GridView1.DataBind();
             }
         }
     }
 }
 catch (Exception ex)
 {
     MessageBox.Show(ex.ToString());

     // ScriptManager.RegisterClientScriptBlock(this, this.GetType(),
     //  "alertMessage",
     //   "alert(ex.ToString());", true);

}

【问题讨论】：

为什么要在catch语句GridView1.DataBind();中绑定gridview？这是唯一的地方还是你在开始这个代码块之前已经完成了，也就是在开始 excel 导出之前？ Gridview 中显示的数据是否正确？导出到 Excel 之前，您是否尝试过调试并检查 gridview 中是否有数据？
我怀疑您的GridView 没有绑定任何单元格。尝试调试并检查数据是否正确绑定到GridView。

标签： c# mysql asp.net

【解决方案1】：

您可以使用以下方法将datagridview数据导出到excel：

public void ExportToExcel(DataGridView dgv)
    {
        try
        {
            dgv.SelectAll();
            dgv.ClipboardCopyMode = DataGridViewClipboardCopyMode.EnableAlwaysIncludeHeaderText;
            DataObject doj = dgv.GetClipboardContent();
            Clipboard.SetDataObject(doj);

            dgv.ClearSelection();

            Microsoft.Office.Interop.Excel.Application exap = new Microsoft.Office.Interop.Excel.Application();
            exap.Visible = true;

            Workbook exwb = (Workbook)exap.Workbooks.Add();
            Worksheet exws = (Worksheet)exwb.Sheets["Sheet1"];

            exws.Paste();

            Clipboard.Clear();

            Range cell1 = exws.Cells[1, 2];
            Range cell2 = exws.Cells[dgv.Rows.Count + 1, dgv.ColumnCount + 1];
            Range cell3 = exws.Cells[1, dgv.ColumnCount + 1];

            Range range = exws.get_Range(cell1, cell2);
            Range colorrange = exws.get_Range(cell1, cell3);

            range.Borders.Weight = XlBorderWeight.xlThin;
            colorrange.Interior.Color = System.Drawing.Color.SteelBlue;
            colorrange.Font.Color = System.Drawing.Color.White;

            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "Excel File 2010 (*.xlsx)|*.xlsx|Excel File 2003 (*.xls)|*.xls";

            if (sfd.ShowDialog() == DialogResult.OK)
            {
                exwb.SaveAs(sfd.FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            }

        }

        catch(System.Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

    }

此方法复制datagridview中的所有数据并将其粘贴到excel中。您当然需要添加对Microsoft.Office.Interop.Excel的引用。

或者，如果您希望将数据表导出到 excel，您可以尝试以下方法：

public void ExporttoExcel(System.Data.DataTable dtbl)
    {
        StringBuilder Output = new StringBuilder();

        //The first "line" will be the Headers.
        for (int i = 0; i < dtbl.Columns.Count; i++)
        {
            Output.Append(dtbl.Columns[i].ColumnName + "\t");
        }

        Output.Append("\n");

        //Generate Cell Value Data
        foreach (DataRow Row in dtbl.Rows)
        {
            if (Row.RowState != DataRowState.Deleted)
            {
                for (int i = 0; i < Row.ItemArray.Length; i++)
                {
                    //Handling the last cell of the line.
                    if (i == (Row.ItemArray.Length - 1))
                    {

                        Output.Append(Row.ItemArray[i].ToString() + "\n");
                    }
                    else
                    {

                        Output.Append(Row.ItemArray[i].ToString() + "\t");
                    }
                }
            }
        }

        Clipboard.SetText(Output.ToString());

        Microsoft.Office.Interop.Excel.Application exap = new Microsoft.Office.Interop.Excel.Application();
        exap.Visible = true;

        Workbook exwb = (Workbook)exap.Workbooks.Add();
        Worksheet exws = (Worksheet)exwb.Sheets["Sheet1"];


        exws.Paste();

        Clipboard.Clear();

        Range cell1 = exws.Cells[1, 1];
        Range cell2 = exws.Cells[dtbl.Rows.Count, dtbl.Columns.Count];
        Range cell3 = exws.Cells[1, dtbl.Columns.Count];

        Range range = exws.get_Range(cell1, cell2);
        Range colorrange = exws.get_Range(cell1, cell3);

        range.Borders.Weight = XlBorderWeight.xlThin;
        colorrange.Interior.Color = System.Drawing.Color.SteelBlue;
        colorrange.Font.Color = System.Drawing.Color.White;

        SaveFileDialog sfd = new SaveFileDialog();

        sfd.Filter = "Excel File 2010 (*.xlsx)|*.xlsx|Excel File 2003 (*.xls)|*.xls";

        if (sfd.ShowDialog() == DialogResult.OK)
        {
            exwb.SaveAs(sfd.FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
        }


    }

请检查这些方法是否有帮助。

【讨论】：

您好，谢谢您的回复，如果我把这段代码放到私人无效中可以吗？还是我应该编辑私人并将其公开？
是的，您可以将方法设为私有，但您在要导出的同一类中使用该方法。它会工作
你的意思是把代码放在我的“导出按钮”上？对不起，我是 ASP 的新手..
类似private void button1_click(object sender, EventArgs e){ExportToExcel(datagridview1)}
在您的导出按钮 onclick 事件中，您可以像上面那样调用 ExportToExcel 方法

【解决方案2】：

使用Text.Replace("&nbsp;", "")

 myRange.Value2 = GridView1.Rows[i].Cells[j].Text.Replace("&nbsp;", "") + ";" == null ? "" : GridView1.Rows[i].Cells[j].Text + ";";

在标记中

<asp:BoundField DataField="EmployeeName" HeaderText="Name" NullDisplayText=" "/>

【讨论】：

@Seryu 在标记中使用 NullDisplayText=""
对不起，我是 Asp 新手，但我认为我的 gridview 是 Templatefield，因为我在这里生成了各种表格。如果是这样，我应该把它放在哪里？

【解决方案3】：

我怀疑您的 GridView 绑定失败。以下是您可以尝试的方法。

private void ExportToExcel()
{
    //First fetch all records from grid to dataset
    DataSet dset = new DataSet();
    dset.Tables.Add();
    //First Add Columns from gridview to excel
    for (int i = 0; i < gridView.Columns.Count; i++) //GridView is id of gridview
    {
        dset.Tables[0].Columns.Add(gridView.Columns[i].HeaderText);
    }
    //add rows to the table 
    System.Data.DataRow dr1;
    for (int i = 0; i < gridView.Rows.Count; i++)
    {
        dr1 = dset.Tables[0].NewRow(); //For Example There are only 3 columns into gridview
        System.Web.UI.WebControls.Label lblCCName = 
          (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblCCName");
        System.Web.UI.WebControls.Label lblItemName = 
          (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblItemName");
        System.Web.UI.WebControls.Label lblItemCode = 
          (System.Web.UI.WebControls.Label)gridView.Rows[i].Cells[0].FindControl("lblItemCode");
        dr1[0] = lblCCName.Text.ToString();
        dr1[1] = lblItemName.Text.ToString();
        dr1[2] = lblItemCode.Text.ToString(); 
        dset.Tables[0].Rows.Add(dr1); 
    }
    //below code is export dset to excel
    ApplicationClass excel = new ApplicationClass();
    Workbook wBook;
    Worksheet wSheet; 
    wBook = excel.Workbooks.Add(System.Reflection.Missing.Value);
    wSheet = (Worksheet)wBook.ActiveSheet;
    System.Data.DataTable dt = dset.Tables[0];
    System.Data.DataColumn dc = new DataColumn();
    int colIndex = 0;
    int rowIndex = 4;
    foreach (DataColumn dcol in dt.Columns)
    {
        colIndex = colIndex + 1;
        excel.Cells[5, colIndex] = dcol.ColumnName;
    }
    foreach (DataRow drow in dt.Rows) 
    {
        rowIndex = rowIndex + 1;
        colIndex = 0;
        foreach (DataColumn dcol in dt.Columns)
        {
            colIndex = colIndex + 1;
            excel.Cells[rowIndex + 1, colIndex] = drow[dcol.ColumnName];
        }
    }
    wSheet.Columns.AutoFit();
    // Server File Path Where you want to save excel file.
    String strFileName = Server.MapPath("~\\Images\\StockStatement.xls");
    Boolean blnFileOpen = false;
    try
    {
        System.IO.FileStream fileTemp = File.OpenWrite(strFileName);
        fileTemp.Close();
    }
    catch
    {
        blnFileOpen = false;
    }
    if (System.IO.File.Exists(strFileName))
    //It checks if file exists then it delete that file.
    {
        System.IO.File.Delete(strFileName);
    }  
}

在Button_Click() 事件中，调用此函数。

【讨论】：

hi 在编译时出错：ApplicationClass excel = new ApplicationClass(); - 无法嵌入互操作类型“Microsoft.Office.Interop.Excel.ApplicationClase”。
您是否添加了所有必需的命名空间？还要检查参考它需要 Microsoft.Office.Interop 12.0。
很抱歉，我应该添加哪些命名空间？是的，我已经在我的参考资料中添加了 Microsoft.Office.Interop 12.0..
1) 在您的项目中添加以下引用：Microsoft Office 12.0 Control Library 现在，在您要使用此功能的页面中添加名称空间：using Microsoft.Office.Interop.Excel;
我在复制您的代码之前已经这样做了，但仍然有错误。

【解决方案4】：

你好，这是我经过漫长的旅程后出现的，我在 Excel 中导出 Gridview 时使用了 Aspose 方法，它简单而强大！希望这会有所帮助，

Export_button 后面的代码：

  //Instantiate a new workbook
            Aspose.Cells.Workbook workbook = new Aspose.Cells.Workbook();
            //Get the first worksheet in the workbook
            Aspose.Cells.Worksheet worksheet = workbook.Worksheets[0];
            //Import data from GridView control to fill the worksheet
            worksheet.Cells.ImportGridView(GridView1, 0, 0, new Aspose.Cells.ImportTableOptions() { IsFieldNameShown = true });
            worksheet.AutoFitColumns();
            //Send result to client in XLS format
            workbook.Save(this.Response, "export.xls", ContentDisposition.Attachment, new Aspose.Cells.XlsSaveOptions());

【讨论】：