C# .NET: Is it possible to create compile time warnings when property is set to invalid values?

Question

This is just a feasibility question. I know that if I say

   int myInt = "5"; 

I get a compile time error. What I want to do is create compile time errors or warnings on objects. So let's say I have a custom object with a few properties. One of the properties cannot be null otherwise the solution will not compile:

   public static class NoNullObjects
   {
       //NotNullable
       public static NotNullObject {get; set;}
   }

MyClass.cs:

   Line#55   NoNullObjects.NotNullObject = null;

When I build I want to see:

   Error: NotNullObject cannot be set to null. MyClass.cs Line 55.

Is there a way to do this?

Answer 1

See http://stackoverflow.com/questions/718630/not-nullable-types

Answer 2

No, not with just C#. Microsoft's Code Contracts work may give you what you want: http://msdn.microsoft.com/en-us/devlabs/dd491992.aspx.

Answer 3

Here is a question that covers the same topic. The accepted answer suggests that you use code contracts.