How to call explicit interface implementation methods internally without explicit casting?

There are lots of ways of doing this without using the cast operator.

Technique #1: Use “as” operator instead of cast operator.

void AnotherMethod()   
{      
    (this as IAInterface).AInterfaceMethod();  // no cast here
}

Technique #2: use an implicit conversion via a local variable.

void AnotherMethod()   
{      
    IAInterface ia = this;
    ia.AInterfaceMethod();  // no cast here either
}

Technique #3: write an extension method:

static class Extensions
{
    public static void DoIt(this IAInterface ia)
    {
        ia.AInterfaceMethod(); // no cast here!
    }
}
...
void AnotherMethod()   
{      
    this.DoIt();  // no cast here either!
}

Technique #4: Introduce a helper:

private IAInterface AsIA => this;
void AnotherMethod()   
{      
    this.AsIA.IAInterfaceMethod();  // no casts here!
}