WPFBinding对数据的检验

设置Binding的ValidationRules属性对Binding进行检验

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<StackPanel> 

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

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

`1`	`</StackPanel>`

后台代码

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public partial class MainWindow : Window 

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    { 

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        public MainWindow() 

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        { 

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            InitializeComponent(); 

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            Person p = new Person { Age = 20, Name = "Tom" }; 

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            Binding binding = new Binding("Age") { Source = p }; 

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            binding.NotifyOnValidationError = true; 

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            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; 

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            RangeValidationRule rv = new RangeValidationRule(); 

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            binding.ValidationRules.Add(rv); 

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            this.txtAge.SetBinding(TextBox.TextProperty, binding); 

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            this.txtAge.AddHandler(Validation.ErrorEvent, new RoutedEventHandler(this.ValidationError)); 

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        } 

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        void ValidationError(object sender, RoutedEventArgs e) 

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        { 

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            if (Validation.GetErrors(this.txtAge).Count > 0) 

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            { 

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                this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString(); 

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                this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString();

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                // You can do everything here when validation error occurs 

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            } 

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        } 

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    } 

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}

同样，我们在XAML里也可以设置验证

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<StackPanel> 

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        <TextBox x:Name="txtAge" FontSize="30" Foreground="Red"   Validation.Error="txtAge_Error"> 

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            <Binding NotifyOnValidationError="True" Path="Age" UpdateSourceTrigger="PropertyChanged"> 

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                <Binding.ValidationRules> 

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                    <local:RangeValidationRule></local:RangeValidationRule> 

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                </Binding.ValidationRules> 

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            </Binding> 

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        </TextBox> 

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

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</StackPanel>

后台代码：

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public partial class MainWindow : Window 

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    {         

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        public MainWindow() 

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        { 

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            InitializeComponent(); 

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            Person p = new Person { Age = 20, Name = "Tom" }; 

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            this.DataContext = p;            

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        }         

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        private void txtAge_Error(object sender, ValidationErrorEventArgs e) 

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        { 

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            if (Validation.GetErrors(this.txtAge).Count > 0) 

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            { 

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                this.txtAge.ToolTip = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString(); 

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                this.errorSummary.Text = Validation.GetErrors(this.txtAge)[0].ErrorContent.ToString(); 

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                // You can do everything here when validation error occurs 

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            } 

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        }         

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}