将GridView导出到Excel / CSV不起作用

Question

我花了最后两天的时间来弄清楚为什么我不能将非常简单的gridview导出到Excel文件或CSV文件中。 当我单击导出按钮时，什么也没有发生，并且我没有收到任何错误。 最初，我尝试了将代码导出到excel中但无法正常工作的代码，现在我正在尝试将代码导出到csv文件中并且此方法也不起作用。 有人可以帮忙吗？ 谢谢：这是标记：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        CellPadding="4"  ForeColor="#333333" 
        GridLines="None">
    <AlternatingRowStyle BackColor="White" />
    <Columns>
        <asp:BoundField DataField="GroupCategory" HeaderText="GroupCategory" 
            SortExpression="GroupCategory" />
        <asp:BoundField DataField="TotalCount" HeaderText="TotalCount" 
            SortExpression="TotalCount" />
    </Columns>
    <EditRowStyle BackColor="#7C6F57" />
    <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#E3EAEB" />
    <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#F8FAFA" />
    <SortedAscendingHeaderStyle BackColor="#246B61" />
    <SortedDescendingCellStyle BackColor="#D4DFE1" />
    <SortedDescendingHeaderStyle BackColor="#15524A" />
</asp:GridView>

这是背后的代码：

 public void BindData()
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);
        SqlDataAdapter da = new SqlDataAdapter("SELECT [GroupCategory], [TotalCount] FROM [Test] ", con);
        DataTable dt = new DataTable();
        da.Fill(dt);
        GridView1.DataSource = dt;
        // GV_InlineEditing.DataBind();
        this.GridView1.DataBind();
    }

    protected void btnExportExcel_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition",
         "attachment;filename=GridViewExport.csv");
        Response.Charset = "";
        Response.ContentType = "application/text";

        GridView1.AllowPaging = false;
        GridView1.DataBind();

        StringBuilder sb = new StringBuilder();
        for (int k = 0; k < GridView1.Columns.Count; k++)
        {
            //add separator
            sb.Append(GridView1.Columns[k].HeaderText + ',');
        }
        //append new line
        sb.Append("\r\n");
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            for (int k = 0; k < GridView1.Columns.Count; k++)
            {
                //add separator
                sb.Append(GridView1.Rows[i].Cells[k].Text + ',');
            }
            //append new line
            sb.Append("\r\n");
        }
        Response.Output.Write(sb.ToString());
        Response.Flush();
        Response.End();

    }

    public override void VerifyRenderingInServerForm(Control control)
    {
        /* Verifies that the control is rendered */
    }

Answer 1

Public Shared Sub Export(ByVal fileName As String, ByVal gv As GridView, Optional ByVal IncludeFooter As Boolean = True)

        HttpContext.Current.Response.Clear()
        HttpContext.Current.Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", fileName))
        HttpContext.Current.Response.ContentType = "application/vnd.ms-excel"
        HttpContext.Current.Response.Charset = "UTF-8"
        Dim sw As StringWriter = New StringWriter
        Dim htw As HtmlTextWriter = New HtmlTextWriter(sw)
        '  Create a form to contain the grid
        Dim table As Table = New Table
        '  add the header row to the table
        If (Not (gv.HeaderRow) Is Nothing) Then
            myGridview.PrepareControlForExport(gv.HeaderRow)
            table.Rows.Add(gv.HeaderRow)
        End If
        '  add each of the data rows to the table
        For Each row As GridViewRow In gv.Rows
            myGridview.PrepareControlForExport(row)
            table.Rows.Add(row)
        Next
        '  add the footer row to the table
        If IncludeFooter Then
            If (Not (gv.FooterRow) Is Nothing) Then
                myGridview.PrepareControlForExport(gv.FooterRow)
                table.Rows.Add(gv.FooterRow)
            End If
        End If
        '  render the table into the htmlwriter
        table.RenderControl(htw)
        '  render the htmlwriter into the response
        HttpContext.Current.Response.Write(Replace(sw.ToString, "'", "''"))

        HttpContext.Current.Response.End()
    End Sub

    ' Replace any of the contained controls with literals
    Private Shared Sub PrepareControlForExport(ByVal control As Control)
        Dim i As Integer = 0
        Do While (i < control.Controls.Count)
            Dim current As Control = control.Controls(i)
            If (TypeOf current Is LinkButton) Then
                control.Controls.Remove(current)
                control.Controls.AddAt(i, New LiteralControl(CType(current, LinkButton).Text))
            ElseIf (TypeOf current Is ImageButton) Then
                control.Controls.Remove(current)
                control.Controls.AddAt(i, New LiteralControl(CType(current, ImageButton).AlternateText))
            ElseIf (TypeOf current Is HyperLink) Then
                control.Controls.Remove(current)
                control.Controls.AddAt(i, New LiteralControl(CType(current, HyperLink).Text))
            ElseIf (TypeOf current Is DropDownList) Then
                control.Controls.Remove(current)
                control.Controls.AddAt(i, New LiteralControl(CType(current, DropDownList).SelectedItem.Text))
            ElseIf (TypeOf current Is CheckBox) Then
                control.Controls.Remove(current)
                control.Controls.AddAt(i, New LiteralControl(CType(current, CheckBox).Checked))
                'TODO: Warning!!!, inline IF is not supported ?
            End If
            If current.HasControls Then
                myGridview.PrepareControlForExport(current)
            End If
            i = (i + 1)
        Loop
    End Sub

Answer 2

您可以尝试使用以下命令将数据集导出到Excel：

public void ConvertDataSetToExcel(DataSet dataSet, string strTempFileName)
{
    XmlDocument xmlDataDoc = null;
    XslCompiledTransform xslTransform = new XslCompiledTransform();
    StreamReader srrReader = null;

    XmlTextReader xtrRdr = null;
    StringWriter stwWriter = null;
    StreamWriter srwWriter = null;

    xmlDataDoc = new XmlDocument();
    xmlDataDoc.LoadXml(dataSet.GetXml());
    srrReader = new StreamReader(path_to_embedded_xsl);
    xtrRdr = new XmlTextReader(srrReader);
    stwWriter = new StringWriter();
    xslTransform.Transform(xmlDataDoc, null, stwWriter);
    xslTransform.Transform(xmlDataDoc, null, stwWriter);
    srwWriter = new StreamWriter(strTempFileName);
    srwWriter.Write(stwWriter.ToString());
    srwWriter.Close();
}

请注意，这更多是用于桌面的实现，因此您必须更改它才能与we应用程序一起使用。 有关更多详细信息，请参阅：

http://www.codeproject.com/Articles/9380/Export-a-DataSet-to-Microsoft-Excel-without-the-us http://www.codeproject.com/Articles/11171/DataSet-to-Excel两种风格的两个步骤

Answer 3

现在一切正常，但我的错是我什至忘记为按钮添加点击，所以这就是为什么它什么也没做的原因。 谢谢大家