IDataErrorInfo vs ValidationRule vs Exception

Question

Can anyone tell me which is a better approach for Validation in WPF.

1. Implementing IDataErrorInfo
2. Creating ValidationRule
3. Throwing Exceptions

Answer 1

It is not good idea to use exception for error handling. Using exception will reduce performance. It is a matter of selecting and Implementing IDataErrorInfo or Creating ValidationRule.

IDataErrorInfo

• Validation logic keep in view model and easy to implement and maintain
• Full control over all fields in the viewmodel

Validation Rule

• Maintains the validation rule in separate class
• Increase re-usability. For example you can implement required field validations class reuse it throughout the application.

My opinion is, for common validation like required field validations, email address validattions you can use validation rule. If you need to do custom validations like range validations , or whatever custom validation use IDataerrorinfo.