GridView 必须放在带有 runat=“server"的表单标签内.即使在 GridView 位于表单标签内之后

问题描述

<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>

后面的代码:

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 位于带有 runat="server" 的 from 标记内，我仍然收到此错误.

Even the GridView is within a from tag with runat="server", still I am getting this error.

请问有什么线索吗?

推荐答案

您正在调用 GridView.RenderControl(htmlTextWriter)，因此页面引发了一个异常，即 Server-Control 在形式.

You are calling GridView.RenderControl(htmlTextWriter), hence the page raises an exception that a Server-Control was rendered outside of a Form.

您可以通过覆盖 VerifyRenderingInServerForm 来避免这种情况

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

请参阅此处和这里.

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