validation - How do I custom validate collections withing MVC5 -

i building mvc5 application , have following viewmodels:

public class userpartyviewmodel {     public userpartyviewmodel()     {         entitlements = new collection<assignedclaims>();     }      public guid partyid { get; set; }     public string partyname { get; set; }      public icollection<assignedclaim> assignedclaims{ get; set; } }  public class assignedclaims {     public assignedclaims()     {         claimvalues = new collection<assignedclaimvalue>();     }      public string name { get; set; }     public int max { get; set; }     public int min { get; set; }      public icollection<assignedclaimvalue> claimvalues { get; set; } }  public class assignedclaimvalue {     public guid claimvalueid { get; set; }     public string claimvalue { get; set; }     public bool assigned { get; set; } } 

contained in userpartyviewmodel assignedclaim name of "security" , assignedclaimvalue claimvalue of "user"

if claimvalue of user assigned need validate rest of model. if not no further validation should take place.

within assignedclaims there min , max, these minimum , maximum number of assignedclaimvalues should assigned.

i have tried use attributevalidate cannot stop validating rest of model.

i have looked @ ivalidatableobject interface can't work out how control validation of child collections depending on user claim.

what's best way achieve this?

found solution appears want:

public class userpartyviewmodel : ivalidatableobject {     public userpartyviewmodel()     {         entitlements = new collection<assignedclaims>();     }      public string accesslevel { get; set; }      public guid partyid { get; set; }      public string partyname { get; set; }      public icollection<assignedclaims> entitlements { get; set; }      public ienumerable<validationresult> validate(validationcontext validationcontext)     {         var isuser = entitlements.any(c => c.name == "security" && c.claimvalues.any(v => v.assigned == true && v.claimvalue == "user"));          if (isuser)         {             int = 0;             foreach (var result in entitlements)             {                 yield return result.validate(i++);             }         }         else         {             yield return validationresult.success;         }     } }  public class assignedclaims {     public assignedclaims()     {         claimvalues = new collection<assignedclaimvalue>();     }      public string name { get; set; }     public string description { get; set; }     public int max { get; set; }     public int min { get; set; }      public icollection<assignedclaimvalue> claimvalues { get; set; }       public validationresult validate(int item)     {          int min = min;         int max = (claimvalues.count() < max) ? claimvalues.count() : max;         int assignedcount = claimvalues.where(i => i.assigned == true).count();          if (!(min <= assignedcount && assignedcount <= max))         {             string errmessage = string.format("{2} should have between {0} , {1} security claims checked.", min, max, name);             return new validationresult(errmessage, new[] { string.format("entitlements[{0}]", item) });         }         else         {             return validationresult.success;         }      }  } 

the issue had trying error messages appearing in correct place. in view assignedclaims added:

@html.validationmessagefor(model => model, "", new { @class = "text-danger" }) 

and passed iteration through validate function on assignedclaim ensure added correct member.