blocks|key|504006|text|当我尝试测试我构建的自定义未处理异常过滤器时，也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|504007|这就起到了作用。大量的更新和很长的代码行。|504008|var+httpActionExecutedContext+=+new+HttpActionExecutedContext(
++++new+HttpActionContext(
++++++++new+HttpControllerContext(
++++++++++++new+HttpConfiguration(),
++++++++++++Substitute.For<IHttpRouteData>(),
++++++++++++new+HttpRequestMessage()),
++++Substitute.For<HttpActionDescriptor>()),
++++null);|code-block|syntax|javascript|504009|使用的是NSubstiute，但您选择的任何处理抽象基类的模拟框架都可以。|504010|希望这能有所帮助|504011|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I had the same problem when trying to test a custom unhandled exception filter I had built.

This did the trick. Lots of newing up and a very long line of code.

<pre><code>var httpActionExecutedContext = new HttpActionExecutedContext(
 new HttpActionContext(
 new HttpControllerContext(
 new HttpConfiguration(),
 Substitute.For&lt;IHttpRouteData&gt;(),
 new HttpRequestMessage()),
 Substitute.For&lt;HttpActionDescriptor&gt;()),
 null);
</code></pre>

NSubstiute was used, but any mocking framework of your choice that handles abstract base classes would be fine.

Hope this helps

blocks|key|504065|text|我也一直在为这件事碰壁。我尝试了contextUtil，但一直得到一个空引用异常。我发现了如何在this+post+N.B中调用actionFilter。当使用过滤器的模拟实例时，actionFilter不会被调用，我必须使用真实的对象。HTH|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|504066|具体地说：|504067|var+httpActionContext+=+new+HttpActionContext
{
++++ControllerContext+=+new+HttpControllerContext
++++{
++++++++Request+=+requestMessage
++++}
};

//call+filter
var+filter+=+new+FooFilter();
filter.OnActionExecuting(httpActionContext);|code-block|syntax|javascript|504068|entityMap|0|LINK|mutability|MUTABLE|url|http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/98d041ae352f#test/System.Web.Http.Test/Filters/ActionFilterAttributeTest.cs|1|https://stackoverflow.com/questions/21152777/unit-test-webapi2-passing-header-values^0|G|B|0|1C|9|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

I've been banging my head against a brick wall over this also. I tried <a href="http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/98d041ae352f#test/System.Web.Http.Test/Filters/ActionFilterAttributeTest.cs" rel="nofollow noreferrer">contextUtil</a> but kept getting a null reference exception. I found out how to call an actionFilter in <a href="https://stackoverflow.com/questions/21152777/unit-test-webapi2-passing-header-values">this post</a>
N.B. The actionFilter wasn't being invoked when using a Mock instance of the filter, I had to use the real object.
HTH

Specifically:

<pre><code>var httpActionContext = new HttpActionContext
{
 ControllerContext = new HttpControllerContext
 {
 Request = requestMessage
 }
};

//call filter
var filter = new FooFilter();
filter.OnActionExecuting(httpActionContext);
</code></pre>

blocks|key|287380|text|只有一个新的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287381|private+HttpActionContext+CreateExecutingContext()
{
++++return+new+HttpActionContext+{+ControllerContext+=+new+HttpControllerContext+{+++Request+=+new+HttpRequestMessage()+}+};
}

private+HttpActionExecutedContext+CreateExecutedContextWithStatusCode(HttpStatusCode+statusCode)
{
++++return+new+HttpActionExecutedContext
++++{
++++++++ActionContext+=+new+HttpActionContext
++++++++{
++++++++++++ControllerContext+=+new+HttpControllerContext
++++++++++++{
++++++++++++++++Request+=+new+HttpRequestMessage()
++++++++++++}
++++++++},
++++++++Response+=+new+HttpResponseMessage
++++++++{
++++++++++++StatusCode+=+statusCode,
++++++++++++Content+=+new+StringContent("blah")
++++++++}
++++};
}|code-block|syntax|javascript|287382|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just new one up.

<pre><code>private HttpActionContext CreateExecutingContext()
{
 return new HttpActionContext { ControllerContext = new HttpControllerContext { Request = new HttpRequestMessage() } };
}

private HttpActionExecutedContext CreateExecutedContextWithStatusCode(HttpStatusCode statusCode)
{
 return new HttpActionExecutedContext
 {
 ActionContext = new HttpActionContext
 {
 ControllerContext = new HttpControllerContext
 {
 Request = new HttpRequestMessage()
 }
 },
 Response = new HttpResponseMessage
 {
 StatusCode = statusCode,
 Content = new StringContent("blah")
 }
 };
}
</code></pre>

blocks|key|287448|text|这里有一个2018年的工作示例(.NET框架4.5.1)。它使用ExceptionFilterAttribute，但它应该与其他FilterAttributes类似。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|287449|[Test]
public+void+MyTest()
{
++++var+request+=+new+HttpRequestMessage(HttpMethod.Get,+new+Uri("http://www.google.com"));
++++var+response+=+new+HttpResponseMessage();

++++//+This+next+line+is+necessary+to+avoid+the+following+error
++++//+if+you+call+`context.Request.CreateResponse(...)`+inside+the+filter:
++++//+System.InvalidOperationException:+The+request+does+not+have+an+associated+configuration+object+or+the+provided+configuration+was+null.
++++//+Discovered+from+https://stackoverflow.com/a/44447355/3312114
++++request.SetConfiguration(new+HttpConfiguration());

++++var+context+=+ContextUtil.GetActionExecutedContext(request,+response);

++++_myFilter.OnException(context);+//+Execute+your+methods

++++Assert.AreEqual(HttpStatusCode.InternalServerError,+context.Response.StatusCode);+//+Make+your+assertions
}|code-block|syntax|javascript|287450|然后，只需将ContextUtil类复制到测试项目中的某个位置。@thomasb对@tugberk的回答的评论表明，最新的代码是on+Codeplex。虽然这条评论是在2014年，所以甚至可能有更晚的代码，但2014年的代码对我有效(在2018年1月)，而原始的链接代码不起作用。为了方便起见，我在下面复制了较新的版本。只需将其放入一个新文件。|offset|length|287451|internal+static+class+ContextUtil
{
++++public+static+HttpControllerContext+CreateControllerContext(HttpConfiguration+configuration+=+null,+IHttpController+instance+=+null,+IHttpRouteData+routeData+=+null,+HttpRequestMessage+request+=+null)
++++{
++++++++HttpConfiguration+config+=+configuration+??+new+HttpConfiguration();
++++++++IHttpRouteData+route+=+routeData+??+new+HttpRouteData(new+HttpRoute());
++++++++HttpRequestMessage+req+=+request+??+new+HttpRequestMessage();
++++++++req.SetConfiguration(config);
++++++++req.SetRouteData(route);

++++++++HttpControllerContext+context+=+new+HttpControllerContext(config,+route,+req);
++++++++if+(instance+!=+null)
++++++++{
++++++++++++context.Controller+=+instance;
++++++++}
++++++++context.ControllerDescriptor+=+CreateControllerDescriptor(config);

++++++++return+context;
++++}

++++public+static+HttpActionContext+CreateActionContext(HttpControllerContext+controllerContext+=+null,+HttpActionDescriptor+actionDescriptor+=+null)
++++{
++++++++HttpControllerContext+context+=+controllerContext+??+ContextUtil.CreateControllerContext();
++++++++HttpActionDescriptor+descriptor+=+actionDescriptor+??+CreateActionDescriptor();
++++++++descriptor.ControllerDescriptor+=+context.ControllerDescriptor;
++++++++return+new+HttpActionContext(context,+descriptor);
++++}

++++public+static+HttpActionContext+GetHttpActionContext(HttpRequestMessage+request)
++++{
++++++++HttpActionContext+actionContext+=+CreateActionContext();
++++++++actionContext.ControllerContext.Request+=+request;
++++++++return+actionContext;
++++}

++++public+static+HttpActionExecutedContext+GetActionExecutedContext(HttpRequestMessage+request,+HttpResponseMessage+response)
++++{
++++++++HttpActionContext+actionContext+=+CreateActionContext();
++++++++actionContext.ControllerContext.Request+=+request;
++++++++HttpActionExecutedContext+actionExecutedContext+=+new+HttpActionExecutedContext(actionContext,+null)+{+Response+=+response+};
++++++++return+actionExecutedContext;
++++}

++++public+static+HttpControllerDescriptor+CreateControllerDescriptor(HttpConfiguration+config+=+null)
++++{
++++++++if+(config+==+null)
++++++++{
++++++++++++config+=+new+HttpConfiguration();
++++++++}
++++++++return+new+HttpControllerDescriptor()+{+Configuration+=+config,+ControllerName+=+"FooController"+};
++++}

++++public+static+HttpActionDescriptor+CreateActionDescriptor()
++++{
++++++++var+mock+=+new+Mock<HttpActionDescriptor>()+{+CallBase+=+true+};
++++++++mock.SetupGet(d+=>+d.ActionName).Returns("Bar");
++++++++return+mock.Object;
++++}
}|287452|entityMap|0|LINK|mutability|MUTABLE|url|https://aspnetwebstack.codeplex.com/SourceControl/latest#test/System.Web.Http.Test/Util/ContextUtil.cs^0|0|0|1S|B|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Here's a working example from 2018 (.NET Framework 4.5.1). It uses an ExceptionFilterAttribute but it should be similar for other FilterAttributes.

<pre><code>[Test]
public void MyTest()
{
 var request = new HttpRequestMessage(HttpMethod.Get, new Uri("http://www.google.com"));
 var response = new HttpResponseMessage();

 // This next line is necessary to avoid the following error
 // if you call `context.Request.CreateResponse(...)` inside the filter:
 // System.InvalidOperationException: The request does not have an associated configuration object or the provided configuration was null.
 // Discovered from https://stackoverflow.com/a/44447355/3312114
 request.SetConfiguration(new HttpConfiguration());

 var context = ContextUtil.GetActionExecutedContext(request, response);

 _myFilter.OnException(context); // Execute your methods

 Assert.AreEqual(HttpStatusCode.InternalServerError, context.Response.StatusCode); // Make your assertions
}
</code></pre>

Then just copy the ContextUtil class into your test project somewhere. @thomasb's comment on @tugberk's answer suggests the latest code is <a href="https://aspnetwebstack.codeplex.com/SourceControl/latest#test/System.Web.Http.Test/Util/ContextUtil.cs" rel="nofollow noreferrer">on Codeplex</a>. While that comment was in 2014 so there may even be later code, the 2014 code worked for me (in Jan 2018) while the original linked code did not. I've copied the later version below for convenience. Just drop this into a new file.

<pre><code>internal static class ContextUtil
{
 public static HttpControllerContext CreateControllerContext(HttpConfiguration configuration = null, IHttpController instance = null, IHttpRouteData routeData = null, HttpRequestMessage request = null)
 {
 HttpConfiguration config = configuration ?? new HttpConfiguration();
 IHttpRouteData route = routeData ?? new HttpRouteData(new HttpRoute());
 HttpRequestMessage req = request ?? new HttpRequestMessage();
 req.SetConfiguration(config);
 req.SetRouteData(route);

 HttpControllerContext context = new HttpControllerContext(config, route, req);
 if (instance != null)
 {
 context.Controller = instance;
 }
 context.ControllerDescriptor = CreateControllerDescriptor(config);

 return context;
 }

 public static HttpActionContext CreateActionContext(HttpControllerContext controllerContext = null, HttpActionDescriptor actionDescriptor = null)
 {
 HttpControllerContext context = controllerContext ?? ContextUtil.CreateControllerContext();
 HttpActionDescriptor descriptor = actionDescriptor ?? CreateActionDescriptor();
 descriptor.ControllerDescriptor = context.ControllerDescriptor;
 return new HttpActionContext(context, descriptor);
 }

 public static HttpActionContext GetHttpActionContext(HttpRequestMessage request)
 {
 HttpActionContext actionContext = CreateActionContext();
 actionContext.ControllerContext.Request = request;
 return actionContext;
 }

 public static HttpActionExecutedContext GetActionExecutedContext(HttpRequestMessage request, HttpResponseMessage response)
 {
 HttpActionContext actionContext = CreateActionContext();
 actionContext.ControllerContext.Request = request;
 HttpActionExecutedContext actionExecutedContext = new HttpActionExecutedContext(actionContext, null) { Response = response };
 return actionExecutedContext;
 }

 public static HttpControllerDescriptor CreateControllerDescriptor(HttpConfiguration config = null)
 {
 if (config == null)
 {
 config = new HttpConfiguration();
 }
 return new HttpControllerDescriptor() { Configuration = config, ControllerName = "FooController" };
 }

 public static HttpActionDescriptor CreateActionDescriptor()
 {
 var mock = new Mock&lt;HttpActionDescriptor&gt;() { CallBase = true };
 mock.SetupGet(d =&gt; d.ActionName).Returns("Bar");
 return mock.Object;
 }
}
</code></pre>

I was looking to add an Action Filter to my service to handle adding link data to the response message. I have found that I need to mock HttpActionExecutedContext but it's a difficult class to mock, how are you dealing with Action Filter testing?

How can you unit test an Action Filter in ASP.NET Web Api?

我希望将Action Filter添加到我的服务中，以处理将链接数据添加到响应消息。我发现我需要模拟HttpActionExecutedContext，但它是一个很难模拟的类，你是如何处理Action Filter测试的？

问如何在ASP.NET Web中对操作过滤器进行单元测试？
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