Defining operators and testing for null

I have a class in C# where I define the operator ==. The method I have currently throws an object is null exception when testing the following

MyClass a = new MyClass(); if(a==null)....

This is frustrating because in the definition of the operator i can't ask if either parameter is null because it will just go into in开发者_开发知识库finite recursion.

How do I test to see if either parameter is null when defining the == operator.

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Use object.ReferenceEquals:

if (object.ReferenceEquals(objA, null)) { ... }

Another option is to cast objA to object:

if ((object)objA == null) { ... }

You may want to consult these guidelines.

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Use Object.ReferenceEquals(objA, null).