Asp.net GridView 必须放在带有 runat="server" 的表单标签内，即使 GridView 位于表单标签内

发布于06月14日

<form runat="server" id="f1">
    <div runat="server" id="d">
        grid view:
        <asp:GridView runat="server" ID="g">
        </asp:GridView>
    </div>

    <asp:TextBox runat="server" ID="t" TextMode="MultiLine" Rows="20" Columns="50"></asp:TextBox>
</form>

代码隐藏:

public partial class ScriptTest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        g.DataSource = new string[] { "a", "b", "c" };
        g.DataBind();

        TextWriter tw = new StringWriter();
        HtmlTextWriter h = new HtmlTextWriter(tw);    
        d.RenderControl(h);
        t.Text = tw.ToString();
    }
}

即使GridView在具有runat="server"的from标记中，我仍然收到这个错误.

有什么线索吗？

推荐答案

您正在调用GridView.RenderControl(htmlTextWriter)，因此页面会引发一个异常，即服务器控件是在窗体外部呈现的.

您可以通过重写VerifyRenderingInServerForm来避免此异常

public override void VerifyRenderingInServerForm(Control control)
{
  /* Confirms that an HtmlForm control is rendered for the specified ASP.NET
     server control at run time. */
}

见here6960.aspx/1?Problem%20with%20GridView%20s%20RenderControl" rel="noreferrer">here和here.