如何使用 C# lang 将 gridview 数据转换为 ASP .net 中的 Excel 工作表

Question

我想将 GridView 数据转换为 Excel 工作表。

我已经编写了下面的代码，但它给出了错误：

protected void Button1_Click(object sender, EventArgs e) 
{       
    Response.Clear();
    Response.AddHeader("content-disposition", "attachment;filename=Avukat.xls");
    Response.Charset = "";

    Response.ContentType = "application/vnd.xls";
    System.IO.StringWriter stringWrite = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
    GridView1.RenderControl(htmlWrite);
    Response.Write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />");
    Response.Write(stringWrite.ToString());
    Response.End();
}

错误：

“GridView”类型的控件“ctl00_ContentPlaceHolder1_GridView1”必须放置在带有 runat=server 的表单标记内。

Answer 1

我认为您的 gridview 包含 linkbutton/Imagebutton 或其他类型的控件，这就是当您尝试将 GridView 导出到 Excel 时出现异常的原因。

在使用该控件之前，您需要在 Page 代码后面或 BasePage 代码后面添加以下几行。

public override void VerifyRenderingInServerForm(Control control)
{
}

您可以使用此代码，因为此代码经过测试并且运行良好：

System.IO.StringWriter sw = new System.IO.StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
Response.AddHeader("content-disposition", "attachment; filename=Avukat.xls");
Response.ClearContent();

Response.AddHeader("content-disposition", attachment);

GridView1.RenderControl(htw);
Response.Write(sw.ToString());
Response.Flush();
Response.End();

Answer 2

你错过了这一部分：

HtmlForm _HtmlForm= new HtmlForm();
GridView1.Parent.Controls.Add(_HtmlForm);
_HtmlForm.Attributes["runat"] = "server";
_HtmlForm.Controls.Add(GridView1);
_HtmlForm.RenderControl(htmlWrite);

我的意思是你应该使用这行代码：

_HtmlForm.RenderControl(htmlWrite);

而不是：

GridView1.RenderControl(htmlWrite); 

但我认为最好使用这个免费的开源组件，它可以从/导出不同的 Excel 和 Word 格式： http://npoi.codeplex.com/

Answer 3

您只需要复制下面的代码。

public override void VerifyRenderingInServerForm(Control control)
    {

        // Confirms that an HtmlForm control is rendered for the
        specified ASP.NET server control at run time.

    }

Answer 4

System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

this.gvTask.RenderBeginTag(htmlWrite);
this.gvTask.HeaderRow.RenderControl(htmlWrite);
foreach (GridViewRow row in this.gvTask.Rows)
{
    row.RenderControl(htmlWrite);
}
this.gvTask.FooterRow.RenderControl(htmlWrite);
this.gvTask.RenderEndTag(htmlWrite); 

Answer 5

//**how gridview data download in excel in asp.net**

protected void btnDownload_Click(object sender, EventArgs e)
{
    CommonFunction objComm = new CommonFunction();
    Hashtable objHash = new Hashtable();
    //Hashtable htParam = new Hashtable();
    objHash.Clear();
    string str = ddlMonthlyYrs.SelectedItem.Text.ToString();
    if (str == "Select")
    {
        objHash.Add("@Cmonth", "");
    }
    else
    {
        objHash.Add("@Cmonth", str.Substring(0, 6));
    }
    if (ddlPaymentTerm.SelectedItem.Text == "Select")
    {
        objHash.Add("@PaymentTerm", "");
    }
    else
    {
        objHash.Add("@PaymentTerm", ddlPaymentTerm.SelectedValue.ToString());
    }
    if (ddlPayMode.SelectedItem.Text == "Select")
    {
        objHash.Add("@PaymentMode", "");
    }
    else
    {
        objHash.Add("@PaymentMode", ddlPayMode.SelectedValue);
    }

    objHash.Add("@PolicyNo", txtPolicyNo.Text);

    objHash.Add("@AgentCode", txtAgnCode.Text);
    objHash.Add("@AgentName", txtAgnName.Text);

    DataSet objDS = objComm.GetDataSetForPrcDBConn("Prc_GetIncBasedataRp", objHash, "Commssion");

    BasicComm.CommonFunction objCom = new BasicComm.CommonFunction();
    Response.Clear();
    //Response.Charset=”";
    Response.ContentType = "application/vnd.ms-excel";
    System.IO.StringWriter stringWrite = new System.IO.StringWriter();
    System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
    System.Web.UI.WebControls.DataGrid dg = new System.Web.UI.WebControls.DataGrid();
    dg.DataSource = objDS.Tables[0];
    dg.DataBind();
    dg.RenderControl(htmlWrite);
    Response.Write(stringWrite.ToString());
    Response.End();
}