Set ContentEncoding when mocking WebResponse

Question

I'm stuck on how to set the contentencoding property as it is not overridable via moq.

I currently have the following:

var expected = "dfgdfgdfgdfg"; var expectedBytes = Encoding.UTF8.GetBytes(expected); var responseStream = new MemoryStream(); responseStream.Write(expectedBytes, 0, expectedBytes.Length); responseStream.Seek(0, SeekOrigin.Begin); var response = new Mock<HttpWebResponse>(); response.Setup(c => c.GetResponseStream()).Returns(responseStream); response.Setup(c => c.ContentEncoding).Returns("UTF8");

But I get the following exception:

 Result Message: Invalid setup on a non-virtual (overridable in VB) member: c => c.ContentEncoding

Any idea how I can mock this property?

@IlyaKogan Thanks, I had a look at that before however even with that example code the ContentEncoding prperty throws 'response.ContentEncoding' threw an exception of type 'System.NullReferenceException' — Imran Azad
– Imran Azad, Commented Feb 14, 2015 at 1:54

zaitsman · Accepted Answer · 2015-02-14 02:26:50Z

2

This is what i would do:

 var webHeaderCollectionFieldInfo = typeof (HttpWebResponse).GetField("m_HttpResponseHeaders", BindingFlags.Instance | BindingFlags.NonPublic); var webHeaderCollection = new WebHeaderCollection(); webHeaderCollection.Set("Content-Encoding", "cheese"); webHeaderCollectionFieldInfo.SetValue(response.Object, webHeaderCollection);

Add that instead of your last line.

answered Feb 14, 2015 at 2:26

zaitsman

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2 Comments

Imran Azad Over a year ago

Wow! I went to bed disheartened but woke up to find your answer works like a charm! One thing I don't get though is, how is the webresponse class picking the content-encoding, because your code doesn't appear to be passed anywhere, is it something to do with the Set and SetValue methods?

zaitsman Over a year ago

@ImranAzad This code uses reflection. if you use at HttpWebResponse.ContentEncoding property you will see that it just returns a header out of private field collection, so that is what we got to set to get the outcome that you want.

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