compilation error when passing null as constructor/method argument - c#

Question

Today when i want to verify an object is instantiated correctly with an injected argument, I do something like this:

public class SomeObject
{
    private object _someArgument;

    public SomeObject(object someArgument)
    {
        if (someArgument == null)
        {
            throw new ArgumentNullException("someArgument");
        }

        this._someArgument = someArgument;
    }
}

But I was wandering if I can catch such issues at compile time to avoid errors in run time.

Eg

// Get a compilation error since null was passed
var someInstance = new SomeObject(null);

Is it possible to do?

Answer 1

You can use Code Contracts . It does not produce compile time errors. However it performs static checking on your code and gives warnings if it detects code like var someInstance = new SomeObject(null);

You can use it like this:

public SomeObject(object someArgument)
{
    Contract.Requires(someArgument != null);

    this._someArgument = someArgument;
}