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Silverlight3 Beta:数据检验

  【IT168 技术文档】在Silverlight3中对数据进行校验不再像Silverlight2中那样麻烦了,下面就简要演示一下。
   
  首先,我们创建一个Silverlight3应用,名为:"ValidateSample"
   
  然后将下面的xaml代码复制到"MainPage.xaml"中: 

<Grid x:Name="LayoutRoot" Background="AliceBlue">
        
<Grid.RowDefinitions>
            
<RowDefinition Height="50" />
            
<RowDefinition Height="50" />
            
<RowDefinition Height="150" />
            
<RowDefinition Height="50" />
        
</Grid.RowDefinitions>
        
<Grid.ColumnDefinitions>
            
<ColumnDefinition Width="50"></ColumnDefinition>
            
<ColumnDefinition Width="300"></ColumnDefinition>
        
</Grid.ColumnDefinitions>
        
<TextBlock Text="地址:" Grid.Row="0" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Right"/>
        
<TextBox Margin="5" Name="Address" VerticalAlignment="Center" Width="192" Grid.Row="0" Grid.Column="1"
                Text
="{Binding Address,Mode=TwoWay,ValidatesOnExceptions=True,NotifyOnValidationError=True}"/>
        
<TextBlock Text="标题:" Grid.Row="1" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Right"/>
        
<StackPanel  Grid.Row="1" Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Right">
          
<TextBox Margin="5"  Name="Title" VerticalAlignment="Center" Grid.Row="1" Grid.Column="1" Width="160"
                Text
="{Binding Title,Mode=TwoWay,ValidatesOnExceptions=True,NotifyOnValidationError=True}" />
            
<ComboBox Name="EmailFormat" Width="80" Height="20" SelectedIndex="{Binding Format,Mode=TwoWay,ValidatesOnExceptions=True,NotifyOnValidationError=True}">
                
<ComboBoxItem Content="邮件格式"></ComboBoxItem>
                
<ComboBoxItem Content="Html"></ComboBoxItem>
                
<ComboBoxItem Content="Text"></ComboBoxItem>
            
</ComboBox>          
        
</StackPanel>

        
<TextBlock Text="内容:" Grid.Row="2" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Right"/>
        
<TextBox Margin="5" Name="Body" Grid.Row="2" Grid.Column="1"  Width="230" Height="130"
                Text
="{Binding Body,Mode=TwoWay,ValidatesOnExceptions=True,NotifyOnValidationError=True}" />

        
<Button Grid.Row="3" Grid.Column="1" Content=" 提 交 "  Width="100" Height="30" FontSize="16"/>
        
<!--Click="OnSubmit"-->
</Grid>

  然后就是相应的校验信息类,本示例使用Email校验,相应的CS代码:

public class EmailInfo
    {
        
string address;
        
string title;
        
string body;
        
int format;

        
public EmailInfo(string address, string title, string body, int format)
        {
            
this.address = address;
            
this.title = title;
            
this.body = body;
            
this.format = format;
        }

        
public string Address
        {
            
get { return address; }
            
set
            {
                CheckFieldLength(value,
1, 100);
                
if (!System.Text.RegularExpressions.Regex.IsMatch(value, @"^[\w\.]+@[A-Za-z0-9-_]+[\.][A-Za-z0-9-_]"))
                    
throw new Exception("邮件格式无效!");

                address
= value;
            }
        }
        
public string Title
        {
            
get { return title; }
            
set
            {
                CheckFieldLength(value,
1, 100);
                title
= value;
            }
        }

        
void CheckFieldLength(string value, int min, int max)
        {
            
if ((value.Length < min) || (value.Length > max))
                
throw new Exception("内容长度应在: " + min + "" + max);
        }

        
public string Body
        {
            
get { return body; }
            
set
            {
                CheckFieldLength(value,
1, 100);
                body
= value;
            }
        }

        
public int Format
        {
            
get { return format; }
            
set
            {
                
if (value == 0)
                    
throw new Exception("请选择相应的邮件格式!");

                format
= value;
            }
        }        
    }

  然后,我们只要在MainPage.xaml.cs文件中添加如下代码:

public MainPage()
        {
            InitializeComponent();
            
this.Loaded += OnLoaded;
        }
        
void OnLoaded(object sender, RoutedEventArgs e)
        {
            
this.DataContext = new EmailInfo("daizhj617595@126.com", "你好!", "这是邮件内容", 1);
        }

  接着,运行一下代码:

  
    
  另外,如果想要收集错误信息,以便统一进行显示的话,可以使用“OnValidationError”事件,如下:

public ObservableCollection<ValidationError> Errors { get; set; }

public MainPage()
{
    InitializeComponent();
    
this.Errors = new ObservableCollection<ValidationError>();
    
this.Loaded += OnLoaded;
}
void OnLoaded(object sender, RoutedEventArgs e)
{
    
this.DataContext = new EmailInfo("daizhj617595@126.com", "你好!", "这是邮件内容", 1);
}
private void OnValidationError(object sender, ValidationErrorEventArgs e)
{
    
if(e.Action == ValidationErrorEventAction.Added)
        Errors.Add(e.Error);
    
else if (e.Action == ValidationErrorEventAction.Removed)
        Errors.Remove(e.Error);          
}      

  这样错误信息就被添加到Errors集合中了。
    
  另外还可以通过“点击提交按钮”方式来统一进行收集,下面是一个Button的Click事件代码:

void OnSubmit(object sender, RoutedEventArgs args)
{
     List
<ValidationError> errors = new List<ValidationError>();
    
foreach (UIElement ui in LayoutRoot.Children)
     {
         FrameworkElement fe
= ui as FrameworkElement;
        
if (fe != null)
         {
            
foreach (ValidationError ve in Validation.GetErrors(fe))
             {
                 errors.Add(ve);
             }
         }
     }
}
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