C# 将GridView输出到页面外部的Excel

我希望有一个助手类，它可以为来自多个页面的请求提供服务，以便将任何gridview的内容输出到excel。但是如果我传入GridView，它会抛出一个错误，它必须在“form runat='server'”标记中，这是有意义的。但是，在一个不直接连接到任何特定页面的单独类中，是否仍然可以这样做

代码如下：

  public class Export 
{
    public static void ToExcel(GridView control, params string[] headers)
    {
        HttpResponse context = System.Web.HttpContext.Current.Response; 

        context.AddHeader("content-disposition", "attachment;filename=Report.xls");
        context.ContentType = "application/vnd.ms-excel";
        context.Charset = "";

        StringWriter stringWriter = new StringWriter();
        HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);

        stringWriter.GetStringBuilder().Append("<img src='C:\\logo.png'/>");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<br />");
        stringWriter.GetStringBuilder().Append("<B>");
        stringWriter.WriteLine("Usage Report:  ");
        stringWriter.GetStringBuilder().Append("</B>");
        stringWriter.GetStringBuilder().Append("<br>");
        stringWriter.GetStringBuilder().Append("<br>");
        stringWriter.GetStringBuilder().Append("<table>");
        stringWriter.GetStringBuilder().Append("<tr>");
        stringWriter.GetStringBuilder().Append("<td colspan=4 bgcolor=Gainsboro align=center>");
        stringWriter.GetStringBuilder().Append("<B>");

        foreach (string str in headers)
        {
            stringWriter.Write(str);
            stringWriter.GetStringBuilder().Append("<br />");
        }

        stringWriter.GetStringBuilder().Append("</B>");
        stringWriter.GetStringBuilder().Append("</td>");
        stringWriter.GetStringBuilder().Append("</tr>");

        control.RenderControl(htmlWriter);

        stringWriter.GetStringBuilder().Append("</table>");
        context.Write(stringWriter.ToString());
        context.End();
    }
}

公共类导出
{
公共静态void ToExcel（GridView控件，参数字符串[]头）
{
HttpResponse context=System.Web.HttpContext.Current.Response；
AddHeader（“内容处置”、“附件；文件名=Report.xls”）；
context.ContentType=“application/vnd.ms excel”；
context.Charset=“”；
StringWriter StringWriter=新StringWriter（）；
HtmlTextWriter htmlWriter=新的HtmlTextWriter（stringWriter）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.WriteLine（“使用报告：”）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（
）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（“”）；
foreach（头中的字符串str）
{
stringWriter.Write（str）；
stringWriter.GetStringBuilder（）.Append（
）；
}
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（“”）；
stringWriter.GetStringBuilder（）.Append（“”）；
控件。渲染控件（htmlWriter）；
stringWriter.GetStringBuilder（）.Append（“”）；
Write（stringWriter.ToString（））；
context.End（）；
}
}

对于可能存在此问题的任何人，解决方案是将此重写方法添加到GridView所在的页面：

    public override void VerifyRenderingInServerForm(Control control)
    {
        return;
    }