asp.net-mvc - 流利验证可确保列表中至少包含一项属性值为somevalue的项目

Question

假设我有以下 View 模型:

public class TaskViewModel{
  public MTask Task {get;set;}
  public List<DocIdentifier> Documents {get;set;}
  .....
}

public class DocIdentifier{
  public string DocID {get;set;}
  public bool Selected {get;set;}
}

这是我使用的 Fluent Validation验证器:

public class TaskValidator : AbstractValidator<TaskViewModel>{
   public TaskValidator{

   }
}

如何确定列表 Documents中的至少一个DocIdentifier对象具有其 Selected属性值 True？

Answer 1

您必须使用谓词验证程序Must，在其中您可以基于LINQ扩展名指定自定义条件:

public class TaskValidator : AbstractValidator<TaskViewModel>{
   public TaskValidator()
   {
       RuleFor(task => task.Documents)
           .Must(coll => coll.Any(item => item.Selected)) // you can secify custom condition in predicate validator
           .WithMessagee("At least one of {0} documents should be selected",
               (model, coll) => coll.Count); // error message can use validated collection as well as source model
   }
}