title: Send parameter to custom validationrule
body: <p>Is it possible to send a parameter to a custom validationrule?</p>
  
  <p>My validationrule:</p>
  
  <pre><code>public class CustomTypeSelectedRule : IValidationRule
  {
      public ValidationResult Validate(object input)
      {
          // Here I need an extra value from the class calling
          // the validation rule.
  
          return ValidationResult.Success;
      }
  }
  </code></pre>
  
  <p>My property using the validationrule:</p>
  
  <pre><code>[ContractValidation(typeof(ValidationRules.CustomTypeSelectedRule))]
  public int CustomType
  {
      get
      {
          return this.customType;
      }
      set
      {
          this.customType = value;
      }
  }
  </code></pre>
  
  <p>Any input is appreciated, thanks!</p>