1.页面肯定只有一个form
2.一个页面，一个按钮，按钮里执行下面的代码：
System.IO.StringWriter tw = new System.IO.StringWriter();
HtmlTextWriter wt = new HtmlTextWriter(tw);
this.RenderControl(wt);
string html = tw.ToString();
wt.Close();
tw.Close();
//然后报如下异常
A page can have only one server-side Form tag.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: A page can have only one server-side Form tag.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): A page can have only one server-side Form tag.]
System.Web.UI.Page.OnFormRender(HtmlTextWriter writer, String formUniqueID)
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain()
------解决方案--------------------------------------------------------
System.IO.StringWriter tw = new System.IO.StringWriter(); HtmlTextWriter wt = new HtmlTextWriter(tw); this.RenderControl(wt); string html = tw.ToString(); Response.Write(Server.HtmlEncode(html)); wt.Close(); tw.Close(); Response.End();
------解决方案--------------------------------------------------------
是的，你REender了一个出来
Response.Clear();
System.IO.StringWriter tw = new System.IO.StringWriter();
HtmlTextWriter wt = new HtmlTextWriter(tw);
this.RenderControl(wt);
string html = tw.ToString();
wt.Close();
tw.Close();
Response.End();