ASP.NET MVC - 在RegisterGlobalFilters使用ActionFilterAttribute时Response.Filter为空（） [英] ASP.NET MVC - Response.Filter is null when using ActionFilterAttribute in RegisterGlobalFilters()

问题描述

我想用G-ZIP在我的网站，我用Google搜索以下code：

I want to use G-ZIP on my website, I googled the following code:

public class CompressAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
        if (!string.IsNullOrEmpty(acceptEncoding))
        {
            acceptEncoding = acceptEncoding.ToLower();
            var response = filterContext.HttpContext.Response;
            if (acceptEncoding.Contains("gzip"))
            {
                response.AppendHeader("Content-encoding", "gzip");
                response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
            }
            else if (acceptEncoding.Contains("deflate"))
            {
                response.AppendHeader("Content-encoding", "deflate");
                response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
            }
        }
    }
}

在我的属性设置为一个Controller或Action它工作正常。

It works fine when I set the attribute to a Controller or an Action.

[Compress]
public class PostController : Controller

我不想manully做到这一点的每一块code，所以我注册

I don't want to manully do this on every piece of code, so I registered this attribute in

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new HandleErrorAttribute());
    filters.Add(new CompressAttribute());
}

但是当我运行应用程序，异常就在这条线code的：

But when I run the application, exception came on this line of code:

response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);

在response.Filter为null。

the response.Filter is null.

我想知道为什么发生这种情况，如何解决这个问题。谢谢！

I want to know why this is happening and how to solve this. Thanks!

- 更新：

我发现，发生异常，只有当控制器包含一个孩子的行动，而且它被调用。

推荐答案

我的解决办法是过滤所有孩子的行动。

My solution was to filter all child action.

if (filterContext.IsChildAction) return;

在你的方法顶部使用此code。

Use this code on the top of your method.

public class CompressAttribute : ActionFilterAttribute
{    
   public override void OnActionExecuting(ActionExecutingContext filterContext)
   {
       if (filterContext.IsChildAction) return;

       ...
    }
}

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