Siverlight asynchronous data verification 2

This article describes the DataAnnotation verification mechanism, using the authentication mechanism provided by the RIA service,

Namespace needs to be introduced:

Using System. ComponentModel. DataAnnotations;

This document takes the username and password as an example to describe the required verification method.

The verification class is as follows:

 

1 private string _ userName;
2 [Required (ErrorMessage = "Required")]
3 public string UserName
4 {
5 get {return _ userName ;}
6 set
7 {
8 if (_ userName! = Value)
9 {
10 // _ userName = value;
11 // NotifyPropertyChanged ("UserName ");
12
13 var tmpValidator = new ValidationContext (this, null, null );
14 tmpValidator. MemberName = "UserName ";
15 Validator. ValidateProperty (value, tmpValidator );
16 _ userName = value;
17
18}
1920
21}
22}

The client settings are as follows:

Step 1:

Xmlns: local = "clr-namespace: SilverlightApplication2"

Step 2

<Local: User x: Key = "userDataContext"/>

Step 3 bind the data source

 

1 <TextBox Grid. column = "1" Height = "30" HorizontalAlignment = "Left" Margin = "28, 57, 0, 0 "Name =" textBox1 "DataContext =" {Binding Source = {StaticResource userDataContext} "Text =" {Binding UserName, Mode = TwoWay, NotifyOnValidationError = True, validatesOnExceptions = True} "verticalignment =" Top "Width =" 158 "/>
2 <TextBox Height = "30" HorizontalAlignment = "Left" Margin = "28, 55, 0, 0 "Name =" textBox2 "DataContext =" {Binding Source = {StaticResource userDataContext} "Text =" {Binding Password, Mode = TwoWay, NotifyOnValidationError = True, validatesOnExceptions = True} "verticalignment =" Top "Width =" 158 "Grid. column = "1" Grid. row = "1"/>

 

Step 4: Capture

 

1 private void LayoutRoot_BindingValidationError (object sender, ValidationErrorEventArgs e)
2 {
3 if (e. Action = ValidationErrorEventAction. Added)
4 {
5 (e. OriginalSource as Control). Background = new SolidColorBrush (Colors. Yellow );
6 tbMessage. Text = e. Error. Exception. Message;
7}
8
9 if (e. Action = ValidationErrorEventAction. Removed)
10 {
11 (e. OriginalSource as Control). Background = new SolidColorBrush (Colors. White );
12 tbMessage. Text = "";
13}
14}

 

The effect is as follows:

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