綁定驗證沒有XAML

Question

我的問題是，我們如何可以寫C＃代碼替換爲XAML綁定驗證？ 例如XAML

<TextBox.Text> 
     <Binding Path="Age" UpdateSourceTrigger="PropertyChanged"> 
      <!--<Binding Path="Age" NotifyOnValidationError="True">--> 
      <Binding.ValidationRules> 
      <!--<ExceptionValidationRule />--> 
      **<local:NumberRangeRule Min="0" Max="128" />** 
      </Binding.ValidationRules> 
     </Binding> 
</TextBox.Text> 

如果在C＃代碼

Binding bindtext = new Binding(); 
Person person = new Person("Tom",12); 

bindtext.Source = person; 
bindtext.Mode = BindingMode.TwoWay; 
bindtext.Path = new PropertyPath("Age"); 

bindtext.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; 

bindtext.ValidatesOnExceptions = true; 

ageTextBox.SetBinding(TextBox.TextProperty, bindtext); 

////////////////////////// //

用戶定義驗證類

public class NumberRangeRule : ValidationRule { 
    int _min; 
    public int Min { 
     get { return _min; } 
     set { _min = value; } 
    } 

    int _max; 
    public int Max { 
     get { return _max; } 
     set { _max = value; } 
    } 

    public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo) { 
     int number; 
     if(!int.TryParse((string)value, out number)) { 
     return new ValidationResult(false, "Invalid number format"); 
     } 

     if(number < _min || number > _max) { 
     string s = string.Format("Number out of range ({0}-{1})", _min, _max); 
     return new ValidationResult(false, s); 
     } 

     //return new ValidationResult(true, null); 
     return ValidationResult.ValidResult; 
    } 
    } 

////////////////////////////////

但我們怎麼能寫驗證規則在C＃，使文本框使用綁定驗證？

Answer 1

只需添加一個新的規則？

bindtext.ValidationRules.Add(new NumberRangeRule() { Min = 0, Max = 128 });