c# short(=>) operator overloading

Question

I'm successfully overloading operator like this:

public static Vector3D operator +(Vector3D v1, Vector3D v2){ return new Vector3D(v1._x + v2._x, v1._y + v2._y, v1._z + v2._z); }

I've read on this page that i could also do it like this:

public static Vector3D operator +(Vector3D v1, Vector3D v2) => new Vector3D(v1._x + v2._x, v1._y + v2._y, v1._z + v2._z);

But in this case, under => I got error saying "; expected". What am I missing?

It probably because of the C# version difference or Visual Studio version — Ian
– Ian, Commented May 10, 2017 at 10:52
As @Ian has mentioned, you're probably running a version of Visual Studio that's using an older version of C#. — ThePerplexedOne
– ThePerplexedOne, Commented May 10, 2017 at 10:53
@PawełAudionysos what VS version do you use? The latest C# should do... but it really depends on whether you have it or not — Ian
– Ian, Commented May 10, 2017 at 10:58
You can probably hack your .csproj file to use a newer msbuild/sdk, but you won't get much help from intellisense in Visual Studio so any syntax completion is going to fight you. I would suggest you stay away from the new syntax until you update to a newer visual studio. — Lasse V. Karlsen
– Lasse V. Karlsen, Commented May 10, 2017 at 11:06

Community · Accepted Answer · 2017-05-23 12:34:30Z

Looking at the link you have posted the example:

public static Complex operator +(Complex c1, Complex c2) => new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary); // Override ToString() to display a complex number // in the traditional format: public override string ToString() => $"{this.real} + {this.imaginary}";

strongly suggest that this feature can be applied from the Version of C# 6.0 since also the use of $ as substitute for String.Format exist from the Version of C# 6.0 on and higher.

Try using Visual Studio 2015 to make it work. I did, it worked

Is it possible to update C# version for VS 2012?

Yes, apparently it is. How to do it you will find in this post

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