WPF DataBinding监视抛出异常 [英] WPF DataBinding watch for thrown exceptions

问题描述

在我的模型中，我有很多不同的对象的属性，我正在检查值，同时设置对象的值，如果该值不被接受，我将抛出一个异常，这是完美的Windows窗体属性grgr，但现在我'我试图使用WPF设计一个新的界面。
在WPF中，当我将一个属性绑定到一个控件，如文本框，当该值改变时，我不知道如何处理异常并显示错误消息。
示例：

  public string ConnectionString 
 {
 get 
 {
 return（_ConnectionString）; 
} 
 set 
 {
 try 
 {
 _ConnectionString = value; 
 _SqlConnection = new System.Data.SqlClient.SqlConnection（_ConnectionString）; 
 _ConnectionTested = true; 
} 
 catch（异常捕获）
 {
 _ConnectionTested = false; 
 _TableNameTested = false; 
 _FieldNameTested = false; 
 _ConditionTested = false; 
 _ConnectionString =; 
 // ----删除值---- 
 ValuesCollection.Clear（）; 
 throw（new Exception（Can not Open the connection String \\\
Reason：+ caught.Message））; 
} 
} 
} 
  

，而wpf部分就像：

 < TextBox TextWrapping =Wrapx：Name =ConnectionStringTextBoxText ={Binding Path = ConnectionString，Mode = TwoWay}/> 
  

无论如何，当文本框中的值更改时检查模型是否抛出异常，然后显示用户的exception.message？

谢谢

解决方案

请查看绑定验证。 绑定类有一个 ValidationRules 集合，您可以向其中添加一个 ExceptionValidationRule 。

In my model I have lots of properties for different objects and I'm checking the value while setting value for object and if the value is not accepted I will throw an exception this was working perfect with windows forms propertygrid but now I'm trying to design a new interface using WPF . in WPF when I bound a property to a control like textbox ,when the value is changed I don't know how to handle the exception and show the error message . example :

public string  ConnectionString
        {
            get
            {
                return (_ConnectionString);
            }
            set
            {
                try
                {
                    _ConnectionString  = value ;
                    _SqlConnection = new System.Data.SqlClient.SqlConnection(_ConnectionString);
                    _ConnectionTested = true;
                }
                catch (Exception caught)
                {
                    _ConnectionTested = false;
                    _TableNameTested = false;
                    _FieldNameTested = false;
                    _ConditionTested = false;
                    _ConnectionString = "";
                    //----delete values----
                    ValuesCollection.Clear();
                    throw (new Exception("Can not Open the connection String \nReason : " + caught.Message )); 
                }
            }
        }

and the wpf part is like :

<TextBox TextWrapping="Wrap" x:Name="ConnectionStringTextBox" Text="{Binding Path=ConnectionString, Mode=TwoWay}"/>

is there anyway when the value in textbox is changed check if the model has thrown an exception and then show the exception.message to user ?

thanks

解决方案

Take a look at binding validation. The Binding class has a ValidationRules collection, to which you can add an ExceptionValidationRule.

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