Unknown operator in c#

Question

Hi I'm not an expert in C# and I found this piece of code and don't really understand what it does.

I never saw the operator => in c# before. Is like a redirect?

public byte[] methodA(byte[] data) => 
  this.methodB(data);

No, it is lambda expression. You can read here https://msdn.microsoft.com/library/bb397687.aspx — S. Nadezhnyy, Mar 16 '16 at 13:51
Even though `=>` is (also) known from lambda expressions, this is not a lambda expression. — Dennis_E, Mar 16 '16 at 13:53
[Related question](http://stackoverflow.com/questions/31764532/what-is-the-assignment-in-c-sharp-in-a-property-signature) for Properties rather than Methods. — James Thorpe, Mar 16 '16 at 13:54

score 11 · Accepted Answer · answered Mar 16 '16 at 13:52

11

That's called an expression bodied method. It's new in C# 6.0.

It's equivalent to:

public byte[] methodA(byte[] data) {
  return this.methodB(data);
}

answered Mar 16 '16 at 13:52

Glorin Oakenfoot

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2

In addition to the answer, here's the link to the [MSDN page](https://msdn.microsoft.com/en-us/magazine/dn802602.aspx). Just scroll to the `Expression Bodied Functions and Properties` section. – Peter Szekeli Mar 16 '16 at 13:58

Anwar Ul-haq · Answer 2 · 2016-03-16T14:49:39.423

It's a new feature named "Expression Bodied function" in C#6.0 which reduces your lines of code as well. e.g

 //Old way
        public string Name
        {
            get
            {
                return "David";
            }
        }
//New way
        public string Name => "David";

//old way 
        public Address GetAddressByCustomerId(int customerId)
        {
            return AddressRepository.GetAddressByCustomerId(customerId);
        }
//New Way
        public Address GetAddressByCustomerId(int customerId) => 
               AddressRepository.GetAddressByCustomerId(customerId);

Unknown operator in c#

2 Answers2