Compiler Warning (level 3) CS1717 - C# (original) (raw)

Assignment made to same variable; did you mean to assign something else?

This warning occurs when you assign a variable to itself, such as a = a.

Several common mistakes can generate this warning:

• Writing a = a as the condition of an if statement, such as if (a = a). You probably meant to say if (a == a), which is always true, so you could write this more concisely as if (true).
• Mistyping. You probably meant to say a = b.
• In a constructor where the parameter has the same name as the field, not using the this keyword: you probably meant to say this.a = a.

Example

The following sample generates CS1717.

// CS1717.cs  
// compile with: /W:3  
public class Test  
{  
   public static void Main()  
   {  
      int x = 0;  
      x = x;   // CS1717  
   }  
}