How to set Minvalue and Max Value for a testbox in wpf

Question

hi,

 

In my application. I need to validate a textbox like

If the user enter the minvalue specfied in the textbox it should restrict if the entered value is less than that.  Simliarly if there is a maxvalue specified then it should restrict the user enter greater than the max value.

How do we acheive this?

Answer 1

Try to use NumericUpDown: http://msdn.microsoft.com/en-us/library/ms771573.aspx

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Regards

Answer 2

Hi,

 please check out this link for validation

http://weblogs.asp.net/monikadyrda/archive/2009/06/24/wpf-textbox-validation.aspx

Answer 3

For Validation in WPF you can create ValidationRule. And specify the which validation rules you need to execute at the time of binding in Binding.ValidationRules. So for the same you can create RangeValidationRule.

 public class RangeValidationRule : ValidationRule
  {
    public int MinValue { get; set; }
    public int MaxValue { get; set; }
 
    public override ValidationResult Validate(
      object value, System.Globalization.CultureInfo cultureInfo)
    {
      int intValue;
 
      string text = String.Format ("Must be between {0} and {1}",
                     MinValue, MaxValue);
      if (! Int32.TryParse(value.ToString(), out intValue))
        return new ValidationResult(false, "Not an integer");
      if (intValue < MinValue)
        return new ValidationResult(false, "To small. " + text);
      if (intValue > MaxValue)
        return new ValidationResult(false, "To large. " + text);
      return ValidationResult.ValidResult;
    }
  }
 
Usage :

 <Binding.ValidationRules>
         <local:RangeValidationRule MinValue="3" MaxValue="50" />         
 </Binding.ValidationRules>

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Regards
Nayan Paregi (MCTS)
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