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c#wpfvalidationinotifydataerrorinfo
SZT
SZT

Reputation: 1986

INotifyDataErrorInfo validating property of a property

I am developing my wpf application and using INotifyDataErrorInfo for validation. I have two classes (A & B) and one of them (A) has two instances of the other one (B). Now I want to validation the property of B from A. Is that possible using INotifyDataErrorInfo?

Here's my sample code:

class BaseValidation : INotifyDataErrorInfo, INotifyPropertyChanged
{
   // the implementaion of interface
   public void MyValidationMethod(string propertyName, Func<bool> expression, string errorMessage)
    {

     }
}

class B : BaseValidation
{
    public string MyString 
    {
         get {return _myString;}
         set {_myString = value;}
    }
}

class A : BaseValidation
{
     public B objB1;
     public B objB2

     A(){
          objB1 = new B();
          objB1.PropertyChanged += OnObjBPropertyChanged;
          objB2 = new B();
     }

     private void OnObjBPropertyChanged(object sender, PropertyChangedEventArgs arg)
     {
          MyValidationMethod("objB1.MyString ", () => objB1.MyString != objB2.MyString , "Error");
     // here validation will pass if MyString are not equal
     }
}

I feel like I'm passing the wrong property name in the validation method. And I cannot implement this validation inside B since I need the data of other B object. I would assume this type of validation is possible, as I can assume this to be a common scenario, how can I do this?

Upvotes: 0

Views: 414

Answers (0)

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