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I have implemented custom validator as following...

 public class RquiredFiledValidation:ValidationRule
{
    public string ErrorMessage { get; set; }

    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
    {
        if (string.IsNullOrWhiteSpace(value.ToString()))
            return new ValidationResult(false, ErrorMessage);
        else
            return new ValidationResult(true, null);
    }
}

And Attached this with a text box as following...

 <TextBox x:Name="txtLoging" Grid.Column="1" HorizontalAlignment="Stretch" Validation.ErrorTemplate="{x:Null}" VerticalAlignment="Center"  Margin="0,40,30,0">
        <Binding Path="Text" ElementName="txtLoging" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True">
            <Binding.ValidationRules>
                <Validate:RquiredFiledValidation  ErrorMessage="Please Provide Login Name"></Validate:RquiredFiledValidation>
            </Binding.ValidationRules>
        </Binding>
    </TextBox>

My problem is...

1) When I click directly on login button then the validation doesn't get fired

2) When I put a character in text box validation get fired but produced stack overflow error.

Improve this question
7
  • When I changed UpdateSourceTrigger="LostFocus" It stop working. Commented Dec 22, 2016 at 6:56
  • How you are showing the error? Do you have any style or validation.ErrorTemplate for that? Provide the stack overflow error details. Commented Dec 22, 2016 at 8:37
  • Yes, i have control template defined in resource for error template. I have solved the second problem. But first problem is still there. And i have encounter with another problem that is error message is getting overlapped with other control. Commented Dec 22, 2016 at 8:44
  • Any help on first question..When i click directly on login button then the validation doesn't get fired Commented Dec 22, 2016 at 9:11
  • Are you using MVVM? Commented Dec 22, 2016 at 9:26
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