必填

生成的代码

Design-time validations are generated in CacheMetadata for all required properties. This means a workflow will not run unless values are provided for these fields.

...
  
 #region Protected Methods
protected override void CacheMetadata(CodeActivityMetadata metadata)
{
  if (FirstNumber == null) metadata.AddValidationError(string.Format(Resources.ValidationValue_Error, nameof(FirstNumber)));
  if (SecondNumber == null) metadata.AddValidationError(string.Format(Resources.ValidationValue_Error, nameof(SecondNumber)));
  base.CacheMetadata(metadata);
}
...

UiPath Studio 中的效果

所有必需的输入属性都会自动添加到设计器中。 如果有任何留空，则活动的右上角将显示验证错误。