CSHARP.CLASS.IOF.BAD : Inappropriate Instanceof (C#)

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CSHARP.CLASS.IOF.BAD : Inappropriate Instanceof (C#)

Summary

Properties

Example

public class MyClass 
{

  public string s
  
  public override boolean Equals(Object obj) 
  {
    if(obj != null )
      if (obj is string)    // "Inappropriate Instanceof (C#)" warning issued here 
                            // - expect instance check inside MyClass.Equals() to check MyClass (or a subclass of MyClass, if any) 
        return s.equals(obj);
      
    return false;
  }
}

  public override boolean Equals(Object obj) 
  {
    if(obj != null )
      if (obj is MyClass)
        return s.equals(((MyClass) obj).s);
      
    return false;
  }

Resolution

Check if the is operator can be actually removed and that it is not the sign of an actual programming bug.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.