大家好，又见面了，我是你们的朋友全栈君。当我直接在后台用GridView gv=new GridView();gv.RenderControl(htmlwrite);没有问题，但是如果 我从工具直接拖一个GridView到设计页面，在后台gv.RenderControl(htmlwrite);就会出现 Control ‘GridViewTotal’ of type ‘GridView’ must be placed inside a form tag with runat =server.这个错误！
解决的办法：在后台添加一个重载方法。
public override void VerifyRenderingInServerForm(Control control)
{
/* Confirms that an HtmlForm control is rendered for the specified ASP.NET
server control at run time. */
}
public virtual void VerifyRenderingInServerForm(System.Web.UI.Control control)
Member of System.Web.UI.Page
Summary:
Confirms that an System.Web.UI.HtmlControls.HtmlForm control is rendered for the specified ASP.NET server control at run time.
Parameters:
control: The ASP.NET server control that is required in the System.Web.UI.HtmlControls.HtmlForm control.
Exceptions:
System.Web.HttpException: The specified server control is not contained between the opening and closing tags of the System.Web.UI.HtmlControls.HtmlForm server control at run time.
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