WPF：将值从绑定数据传递给验证规则

快速的问题。我有一个验证器在WPF中配置，检查以确保值在特定范围内。这很好。见下面的代码：WPF：将值从绑定数据传递给验证规则

<TextBox Name="valueTxt" Style="{StaticResource SquareBox}" GotKeyboardFocus="amountTxt_GotKeyboardFocus" GotMouseCapture="amountTxt_GotMouseCapture" LostFocus="boxLostFocus" Height="25" Width="50"> 
          <TextBox.Text> 
           <Binding Path="UnitCost" NotifyOnValidationError="True"> 
            <Binding.ValidationRules> 
             <local:ValidDecimal MaxAmount="1000"></local:ValidDecimal> 
            </Binding.ValidationRules> 
            <Binding.Converter> 
             <local:CurrencyConverter addPound="False" /> 
            </Binding.Converter> 
           </Binding> 
          </TextBox.Text> 
         </TextBox>

但是，我想通过验证程序另一块数据从绑定的数据。我以为我可以将其添加到验证的delcaration像这样：

<local:ValidDecimal MaxAmount="1000" SKU="{Binding Path=tblProducts.ProductSKU}"></local:ValidDecimal>

然而，似乎是我不能以这种方式访问的SKU值。

有什么建议吗？

感谢，

编辑可能是值得指出的是，SKU简直就是我的验证声明的字符串，像这样：

public class ValidDecimal : ValidationRule 
{ 
    public int MaxAmount { get; set; } 
    public string SKU { get; set; } 

    public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo) 
    { 
     //validate the value as a decimal in to two decimal places 
     string cost = (string)value; 
     try 
     { 

      decimal decCost = decimal.Parse(cost); 
      if (SKU != "85555") 
      { 
       if (decCost <= 0 || decCost > MaxAmount) 
       { 
        return new ValidationResult(false, "Amount is not within valid range"); 
       } 
      } 
      return new ValidationResult(true, null); 

     } 
     catch (Exception ex) 
     { 
      return new ValidationResult(false, "Not a valid decimal value"); 
     } 
    } 
}

来源

2010-08-02 Sergio