CODEWITHSUNDEEP
c#assertequalityanonymous-typescompareobject
Alex KeySmith
Alex KeySmith

Reputation: 17101

Assert.Equal anonymous objects across assemblies fails

My Assert.Equal() for an anonymous object is returning false, however very carefully inspecting the properties by hand in the debugger everything seems fine.

It doesn't complain about the properties per say, only the following (which if you compare in a diffing tool is exactly the same).

Expected: { id = 1, name = , children = System.Collections.Generic.List1[System.Collections.Generic.Dictionary2[System.String,System.String]] } (<>f__AnonymousType13[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Collections.Generic.List1[[System.Collections.Generic.Dictionary`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]])

Actual: { id = 1, name = , children = System.Collections.Generic.List1[System.Collections.Generic.Dictionary2[System.String,System.String]] } (<>f__AnonymousType13[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Collections.Generic.List1[[System.Collections.Generic.Dictionary`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]])

Upvotes: 1

Views: 666

Answers (1)

Alex KeySmith
Alex KeySmith

Reputation: 17101

After reading:

Anonymous types unify within an assembly, Part One

Anonymous Types Unify Within An Assembly, Part Two

From what I can tell; within an assembly if an anonymous object has the same properties in the same order, then they can be compared as the same type. But in separate assemblies they cannot be compared as the same type.

After lots of trial and error, I've instead used the CompareObjects open source project to have more control of the equality check. It's not ideal, as I'd prefer to stick to Assert... but I need to work with objects in my context, so this is pretty elegant solution for my problem.

 CompareObjects compareObjects = new CompareObjects();
 compareObjects.MaxDifferences = 1000;
 compareObjects.IgnoreObjectTypes = true; //handles anonymous types
 bool isSame = compareObjects.Compare(exepected, actual);
 Assert.True(isSame, compareObjects.DifferencesString);

Upvotes: 0

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