CODEWITHSUNDEEP
c#c#-6.0
joshmcode
joshmcode

Reputation: 3642

C# 6.0 Approach to Checking if Local Variable or Object is Null (not a field) Using the Null-propagation Operator

I know with the new C# 6.0 you can check for null in the following simplified example:

MyClass myClass = new MyClass();
string example = myClass?.someFieldInMyClass;

This is a more concise way to check for nulls. Great!

I'm curious if there is a way to check if a local variable or parameter being passed in is null using the new operator. So if a parameter was passed to a method like so:

    public static void SomeMethod(mytype t) 
   {
       AnotherClass.myfield = t; 
   }

Is there a way to check if t is null? I've been looking around the documentation and haven't found anything.

I'm looking for something like Anotherclass.somefield = ?t;

Is the expectation that you would check it before passing it? The reason I want to do this is I am passing in a custom type, which is a property on another class. I am then setting the other class with the custom property I'm passing in.

Maybe this is just code smell, I'm open for suggestions.

Upvotes: 1

Views: 426

Answers (1)

Paul Swetz
Paul Swetz

Reputation: 2254

I'm not sure what you are trying to accomplish but if you want to avoid overwriting the value of 

AnotherClass.myfield

With a possible null t then you can just do this

AnotherClass.myfield = t ?? AnotherClass.myfield;

Then it will only change the assignment of myfield if t is NOT null, otherwise it will keep its previous assignment (reassign).

Upvotes: 3

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