DB Validated 值的 ASP.NET MVC 验证体系结构

Question

假设我有这样的课程

public class Blog{
  [Key]
  public int ID{get;set;}

  //these can only be tags that are in the tags db table
  IEnumerable<string> Tags{get;set;}

  //validation pseudocode to illustrate issue
  public bool IsValid() {

    //this is my issue-- how do i get my db context/repository 
    //into my validation logic for this class? i need it
    var goodTags=db.Tags.Select(i=>i.Name);

    //if this tag isn't a "goodTag", then this shouldnt validate
    Tags.ForEach(i=> {

       if(!goodTags.Contains(i))
          return false;
    });
 }
 }

如何在不将数据访问逻辑放入模型中的情况下验证标签中包含的字符串是否在标签数据库表中？我正在使用 MVC3。你是怎么做到的？

谢谢！

Answer 1

使用 IInvalidatableObject 进行自我验证，如下所示：

public Class Blog : IValidatableObject
{
      [Key]
      public int Id {get; set;}

      public ICollection<string> Tags {get; set;}


    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if(!Tags.Contains("testString"))
        {
              yield return new ValidationResult("Not a valid tag.", new [] {"Tags"});
        }
    }
}