无废话WPF系列10: Binding对数据的检验

设置Binding的ValidationRules属性对Binding进行检验

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<StackPanel>        <TextBox x:Name="txtAge" FontSize="30" Foreground="Red"></TextBox>        <TextBlock x:Name="errorSummary" FontSize="30" Foreground="Red"></TextBlock>

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1	</StackPanel>

 

后台代码

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public partial class MainWindow : Window     {                   public MainWindow()         {             InitializeComponent();             Person p = new Person { Age = 20, Name = "Tom" };             Binding binding = new Binding("Age") { Source = p };               binding.NotifyOnValidationError = true;               binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;             RangeValidationRule rv = new RangeValidationRule();             binding.ValidationRules.Add(rv);             this.txtAge.SetBinding(TextBox.TextProperty, binding);               this.txtAge.AddHandler(Validation.ErrorEvent, new RoutedEventHandler(this.ValidationError));         }           void ValidationError(object sender, RoutedEventArgs e)         {             if (Validation.GetErrors(this.txtAge).Count > 0)             {                 this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();                 this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();

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// You can do everything here when validation error occurs             }         }               } }

 

 

同样，我们在XAML里也可以设置验证

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<StackPanel>         <TextBox x:Name="txtAge" FontSize="30" Foreground="Red"   Validation.Error="txtAge_Error">             <Binding NotifyOnValidationError="True" Path="Age" UpdateSourceTrigger="PropertyChanged">                 <Binding.ValidationRules>                     <local:RangeValidationRule></local:RangeValidationRule>                 </Binding.ValidationRules>             </Binding>         </TextBox>         <TextBlock x:Name="errorSummary" FontSize="30" Foreground="Red"></TextBlock> </StackPanel>

 

后台代码：

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public partial class MainWindow : Window     {                public MainWindow()         {             InitializeComponent();             Person p = new Person { Age = 20, Name = "Tom" };             this.DataContext = p;                   }                private void txtAge_Error(object sender, ValidationErrorEventArgs e)         {             if (Validation.GetErrors(this.txtAge).Count > 0)             {                 this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();                   this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();                 // You can do everything here when validation error occurs             }         }        }