ASP.NET：如何重定向,预填充表单数据？

我尝试设置我当前的Request.Form数据：

if (theyWantToDoSomething)
{
   //pre-fill form values
   context.Request.Form["TextBox1"] = "test";
   context.Request.Form["ComboBox1"] = "test 2";
   context.Request.Form["TextBox2"] = GetTheTextForTheThing();

   //tell the client to go there
   context.Response.Redirect("~/SomeWebForm.aspx");
   return;        
}

但我得到一个例外,Form值是只读的.

什么是将客户端发送到另一个页面的方式,预先填写表单数据？

回答

我使用Session状态来存储值.重要的是要注意,默认情况下,Handler无权访问Session(Session对象将为null).通过将IRequiresSessionState标记接口添加到处理程序类,您可以获得have to tell IIS to give you the Session对象：

public class Handler : IHttpHandler,System.Web.SessionState.IRequiresSessionState
{
   public void ProcessRequest(HttpContext context)
   {
      ...
      if (theyWantToDoSomething)
      {
         //pre-fill form values
         context.Session["thing1"] = "test";
         context.Session["thing2"] = "test 2";
         context.Session["thing3"] = GetTheTextForTheThing();

         //tell the client to go there
         context.Response.Redirect("~/SomeWebForm.aspx");
         return; //not strictly needed,since Redirect ends processing
      }
      ...
   }
}