how to use => operator in C# as return value for get accessor

Question

I saw a source code of C# that it was using this syntax for get accessor in a class

public int _f;
public int f
{
    get => _f;
}

instead of

public int _f;
public int f
{
    get {return _f;}
}

and i was wondering do c# have => operator for simplifying

{return x;} 

to

 => x;

if yes what is pre requisties of that? which c# version and which namespaces should be used?

thanks

Answer 1

Now you can do it just if the property is read only, avoiding brackets:

public int MyProperty => 6;

And this has been introduced by the version 6 of the language, so up to C# 5 this won't work either.

For setters as well it will be one of the new features of C# 7 .

Answer 2

It's a new feature of C# 6.0. You can simply write:

public int f => _f;

instead of

public int f
{
    get { return _f; }
}

Remember that this is possible only if the property is readonly (it has only get accessor). Of course instead of _f you can write an expression returning proper type.