执行 RedirectToAction() 时“发送 HTTP 标头后无法重定向”答案

【问题标题】："Cannot redirect after HTTP headers have been sent" when doing RedirectToAction()执行 RedirectToAction() 时“发送 HTTP 标头后无法重定向”
【发布时间】：2017-03-24 17:51:13
【问题描述】：

所以我的问题与其他问题有点不同。对于其他人，他们直接使用Response.Redirect( url );，所以修复只是围绕它。

但是，我在同一个控制器中有如下内容：

public ActionResult Index()
{
  // some other logic running inside this function...

  return RedirectToAction( "Result" );
}

public ActionResult Result()
{
   // Expecting calls being sent from Index

  return View ("done");
}

所以我并没有真正直接调用 Response.Redirect()，但 RedirectToAction() 最终可能会调用 Response.Redirect()。在这种情况下，我该怎么办？

这些是堆栈跟踪：

SYSTEM EXCEPTION:
- Message: Cannot redirect after HTTP headers have been sent.
- Source: System.Web

- Stack Trace:
   at System.Web.HttpResponse.Redirect(String url, Boolean endResponse, Boolean permanent)
   at System.Web.HttpResponseWrapper.Redirect(String url, Boolean endResponse)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)

【问题讨论】：

对我来说似乎很简单。在重定向之前的某个地方，您正在修改 HTTP 标头。但是，鉴于您已经编辑了该代码，谁知道发生了什么。
Why do I get "Cannot redirect after HTTP headers have been sent" when I call Response.Redirect()?的可能重复

标签： asp.net-mvc

【解决方案1】：

在RedirectToAction之前致电Response.Headers.Clear()

【讨论】：

重定向到另一个控制器的动作：RedirectToAction("Logout", "Authentication");