What does => operator pointing from field or a method mean? C# [duplicate]

Question

I've seen an operator => used in the following example:

public int Calculate(int x) => DoSomething(x);

or

public void DoSoething() => SomeOtherMethod();

I have never seen this operator used like this before except in lamba expressions.

What does the following do? Where, when should this be used?

Answer 1

These are Expression Body statements, introduced with C# 6. The point is using lambda-like syntax to single-line simple properties and methods. The above statements expand thusly;

public int Calculate(int x)
{
    return DoSomething(x);
}

public void DoSoething()
{
    SomeOtherMethod();
}

Notably, properties also accept expression bodies in order to create simple get-only properties:

public int Random => 5;

Is equivalent to

public int Random
{
    get
    {
        return 5;
    }
}