Use List.Average() in MonoDevelop

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Hello

Why isn’t the function System.Collections.Generic.List.Average() present when working in Unity3D?

When I copy the code below into Visual Studio C# it all compiles find but in MonoDevelop I get a compiler error saying that there is no function called Average():

// The following is valid code in Visual Studio C# but not in MonoDevelop??
System.Collections.Generic.List<double> a = new System.Collections.Generic.List<double>();
double average = a.Average();

Whats going wrong? Am I including an older/wrong version of .NET?

using UnityEngine; using System.Collections; using System.Collections.Generic; ensure you are using Generics at the top.

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2 Answers

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I believe that’s a LINQ extension method.

You probably need to do a:

using System.Linq;

Ah yes. You are correct sir.

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Great, can you mark it the correct answer yet? Or do you have to get more reputation to do that.

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i believe the person who asked the question is the only one who can mark the question as answered. maybe high level mods too.

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Great, thanks.

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3

The answer is quite simple, unity doesn’t use .Net.

Unity uses mono (2.6 as far as I remember which mostly equals .Net 3.0 and also have some .Net 3.5 functions / classes).

In general if you want to know what’s available, see this page:

http://docs.unity3d.com/410/Documentation/ScriptReference/MonoCompatibility.html

Linq is available in Unity, I've used it myself. Just need to add a using statement.

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The Linq Average method has overloads for all numeric types. No run tiem casting needed. https://msdn.microsoft.com/en-us/library/system.linq.enumerable.average(v=vs.90).aspx

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I'd also expect Linq to start working well on iOS with the new IL2CPP engine that's practically required already for iOS.

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