WPF-Binding对数据的检验

设置Binding的ValidationRules属性对Binding进行检验

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1	<StackPanel>

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

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

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1	</StackPanel>

 

后台代码

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01	public partial class MainWindow : Window

02

{

03

04	public MainWindow()

05

{

06	InitializeComponent();

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

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

09

10	binding.NotifyOnValidationError = true;

11

12	binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

13	RangeValidationRule rv = new RangeValidationRule();

14	binding.ValidationRules.Add(rv);

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

16

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

18

}

19

20	void ValidationError(object sender, RoutedEventArgs e)

21

{

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

23

{

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

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

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

2

}

3

}

4

5

}

6

}

 

 

同样，我们在XAML里也可以设置验证

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01	<StackPanel>

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

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

04	<Binding.ValidationRules>

05	<local:RangeValidationRule></local:RangeValidationRule>

06	</Binding.ValidationRules>

07	</Binding>

08	</TextBox>

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

10	</StackPanel>

 

后台代码：

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01	public partial class MainWindow : Window

02

{

03	public MainWindow()

04

{

05	InitializeComponent();

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

07	this.DataContext = p;

08

}

09	private void txtAge_Error(object sender, ValidationErrorEventArgs e)

10

{

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

12

{

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

14

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

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

17

}

18

}

19

}