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 >

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              }          }        }

本文转自敏捷的水博客园博客，原文链接http://www.cnblogs.com/cnblogsfans/archive/2011/02/19/1958646.html如需转载请自行联系原作者

王德水