private void CheckNull(EmitHelper emit) { if (_throwExceptionIfNull == false && string.IsNullOrEmpty(_exceptionMessage)) { emit .brfalse (Context.ReturnLabel) ; } else { string message = string.Format( string.IsNullOrEmpty(_exceptionMessage)? "'{0}.{1}' is not initialized." : _exceptionMessage, _targetInterface.Name, _memberName, _targetInterface.FullName); Label label = emit.DefineLabel(); emit .brtrue (label) .ldstr (message) .newobj (typeof(InvalidOperationException), typeof(string)) .@throw .MarkLabel (label) ; } }