.NET MVC：如何在辅助方法中重定向响应
我有一些代码，这些代码对于我的一些控制器操作是常见的，这些操作被引入私有“帮助器”方法，仅用于整合。该方法应该为我“获取”一个对象，尽管它执行一些健全/安全检查，并可能将用户重定向到其他操作。
private Thingy GetThingy(int id)
{
var thingy = some_call_to_service_layer(id);
if( null == thingy )
Response.Redirect( anotherActionUrl );
// ... many more checks, all more complex than a null check
return thingy;
}
public ActionResult ActionOne(int id)
{
var thingy = GetThingy(id);
// do more stuff
return View();
}
// ... n more actions
public ActionResult ActionM(int id)
{
var thingy = GetThingy(id);
// do more stuff
return View();
}
System.Web.HttpException: Cannot redirect after HTTP headers have been sent.
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5 个回复
赣借
对象或一个对象。在你的行动中return Redirect("/path"); //or return RedirectToAction("actionname");对象，你需要分离出逻辑。您可以执行以下操作（我假设您要重定向到不同的操作，否则Oenning的代码将起作用）public ActionResult Get(int id) { var thingy = GetThingy(id); var result = checkThingy(thingy); if (result != null) { return result; } //continue... } [NonAction] private ActionResult CheckThingy(Thingy thingy) { //run check on thingy //return new RedirectResult("path"); //run another check //new RedirectResult("different/path"); return null; }public static class ThingyExtensions { public static ActionResult Check(this Thingy thingy) { //run checks here } }驮帽俺篮号
public class RedirectException : Exception { private readonly string _url; public RedirectException(string url) { _url = url; } public string Url { get { return _url; }} }public class RedirectExceptionAttribute : FilterAttribute, IExceptionFilter { public void OnException(ExceptionContext filterContext) { if (filterContext.ExceptionHandled) return; if (filterContext.Exception.GetType() != typeof(RedirectException)) return; filterContext.Result = new RedirectResult(((RedirectException)filterContext.Exception).Url); filterContext.ExceptionHandled = true; } }// in FilterConfig.cs (MVC 4.0) public static void RegisterGlobalFilters(GlobalFilterCollection filters) { filters.Add(new RedirectExceptionAttribute()); }private Thingy GetThingy(int id) { var thingy = some_call_to_service_layer(id); if( null == thingy ) throw new RedirectException( anotherActionUrl ); // ... many more checks, all more complex than a null check return thingy; } public ActionResult ActionOne(int id) { var thingy = GetThingy(id); // do more stuff return View(); } // ... n more actions public ActionResult ActionM(int id) { var thingy = GetThingy(id); // do more stuff return View(); }，或者如果您这样做，请确保重新抛出异常。缮淳彼誊
return RedirectToAction("youraction", "yourcontroller");温拎凯玛
public ActionResult ActionOne(int id) { var thingy = GetThingy(id); if (thingy == null) return RedirectToAction("action", "controller"); // do more stuff return View(); } private Thingy GetThingy(int id) { var thingy = some_call_to_service_layer(id); if( null == thingy ) return null; // ... many more checks, all more complex than a null check return thingy; }方法应放在其他地方。也许和ѭ16在同一个地方。社攻取墟槽
private Thingy GetThingy(int id) { var thingy = some_call_to_service_layer(id); if( null == thingy ) RedirectToAction("myAction").ExecuteResult(ControllerContext); // ... many more checks, all more complex than a null check return thingy; }