internal override void CacheMetadata(ActivityMetadata metadata, Activity owner, string operationName) { MessagingActivityHelper.FixMessageArgument(this.Message, ArgumentDirection.In, metadata); if (this.DeclaredMessageType != null) { if (this.Message == null && this.DeclaredMessageType != TypeHelper.VoidType) { string errorOperationName = ContractValidationHelper.GetErrorMessageOperationName(operationName); metadata.AddValidationError(SR.ValueCannotBeNull(owner.DisplayName, errorOperationName)); } else if (this.Message != null && !this.DeclaredMessageType.IsAssignableFrom(this.Message.ArgumentType)) { string errorOperationName = ContractValidationHelper.GetErrorMessageOperationName(operationName); metadata.AddValidationError(SR.ValueArgumentTypeNotDerivedFromValueType(owner.DisplayName, errorOperationName)); } } }