如何避免“Response.Redirect不能在页面回调中调用”

问题描述

我正在清理一些遗留的框架代码，其中很大一部分是按照异常编码。没有检查值是否为空，因此抛出并捕获了大量的异常。

我已经清理了大部分内容，但是，有几个错误/登录/安全相关的框架方法正在做Response.Redirect，现在我们是使用ajax，我们正在获得ALOT的Response.Redirect不能在页面回调中调用。如果可能，我想避免这种情况。

有没有办法以编程方式避免这种异常？我正在寻找类似

  if（Request.CanRedirect）
 Request.Redirect（url）; 
  

请注意，这也是Server.Transfer发生的，所以我想要检查如果我能够执行Request.Redirect OR Server.Transfer。

目前，它只是这样做

  try 
 {
 Server.Transfer（〜/ Error.aspx）; //有时response.redirect 
} 
 catch（异常abc）
 {
 //在这里处理错误，错误通常是：
 // Response.Redirect不能在页面回调中调用
} 
  

解决方案

你可以尝试

  if（！Page.IsCallback）
 Request.Redirect（url）; 
  

或者如果没有页面便利...

  try 
 {
 if（HttpContext.Current == null）
 return; 
 if（HttpContext.Current.CurrentHandler == null）
 return; 
 if（！（HttpContext.Current.CurrentHandler是System.Web.UI.Page））
 return; 
 if（（（System.Web.UI.Page）HttpContext.Current.CurrentHandler）.IsCallback）
 return; 
 
 Server.Transfer（〜/ Error.aspx）; 
} 
 catch（异常abc）
 {
 //处理
} 
  

I'm cleaning up some legacy framework code and a huge amount of it is simply coding by exception. No values are checked to see if they are null, and as a result, copious amounts of exceptions are thrown and caught.

I've got most of them cleaned up, however, There are a few error / login / security related framework methods that are doing Response.Redirect and now that we are using ajax, we are getting ALOT of "Response.Redirect cannot be called in a Page callback." And I'd like to avoid this if at all possible.

Is there a way to programatically avoid this exception? I'm looking for something like

if (Request.CanRedirect)
    Request.Redirect("url");

Note, this is also happening with Server.Transfer, so I'd like to be able to check if I am able to do Request.Redirect OR Server.Transfer.

Currently, its simply doing this

try
{
    Server.Transfer("~/Error.aspx"); // sometimes response.redirect
}
catch (Exception abc)
{
    // handle error here, the error is typically:
    //    Response.Redirect cannot be called in a Page callback
}

解决方案

You can try

if (!Page.IsCallback)
    Request.Redirect("url");

or if you dont have a Page handy...

try
{
    if (HttpContext.Current == null)
        return;
    if (HttpContext.Current.CurrentHandler == null)
        return;
    if (!(HttpContext.Current.CurrentHandler is System.Web.UI.Page))
        return;
    if (((System.Web.UI.Page)HttpContext.Current.CurrentHandler).IsCallback)
        return;

    Server.Transfer("~/Error.aspx");
}
catch (Exception abc)
{
    // handle it
}

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