Silverlight Validator

<dataInput:Label Margin="4" Target="{Binding ElementName=firstName}" Grid.Row="0" Grid.Column="0" HorizontalAlignment="Right" Content="First Name" />

<TextBox x:Name="firstName" Text="{Binding FirstName, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" Grid.Row="0" Grid.Column="1" Margin="4" />

<TextBlock Text="Explicit Label content" Grid.Row="0" Grid.Column="3" VerticalAlignment="Center" Margin="4" />

 

/// <summary>

/// 数据提交时判断数据是否满足规则

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void Submit_Click(object sender, RoutedEventArgs e)

{

    var validationContext = new ValidationContext(contactGrid.DataContext, null, null);

    List<ValidationResult> validationResults = new List<ValidationResult>();

 

    if (!Validator.TryValidateObject(contactGrid.DataContext, validationContext, validationResults,true))

    {

        HtmlPage.Window.Alert("Validation failed");

    }

    else

    {

        HtmlPage.Window.Alert("Validation passed");

    }

}

 

 

public class Person : INotifyPropertyChanged

{

/// <summary>

/// Represents the first name of the contact.

/// </summary>

private string firstName;

 

/// <summary>

/// Gets or sets the first name of the contact.

/// </summary>

[Required]

[Display(Name = "First Name", GroupName = "Name")]

//[StringLength(10, ErrorMessage = "the length of First Name is between 5 and 10", MinimumLength = 2)]//这种写法在最开始绑定值时，出现异议，如果能保证最开始加载的数据正常，可以加上此判断

public string FirstName

{

    get

    {

        return firstName;

    }

    set

{

    //判读value != firstName 有好处，也有坏处，好处是，值没有变化的时候，不触发OnPropertyChanged 事件，坏处是，如果一开始绑定的数据就是null，本事就不对，可是不会触发

        if (value != firstName)

        {

            //不能使用这种方式，使用这种方式，异常肯定只能出现一次，下次出现不了

            //Validator.ValidateProperty(value, new ValidationContext(this, null, null) { MemberName = "FirstName" });

            //firstName = value;

            //OnPropertyChanged("FirstName");

            firstName = value;

            OnPropertyChanged("FirstName");

            Validator.ValidateProperty(value, new ValidationContext(this, null, null) { MemberName = "FirstName" });

        }

    }

}

 

 

/// <summary>

/// Raises a property changed notification for the specified property name.

/// </summary>

/// <param name="propName">The name of the property that changed.</param>

protected virtual void OnPropertyChanged(string propName)

{

    if (PropertyChanged != null)

    {

        PropertyChanged(this, new PropertyChangedEventArgs(propName));

    }

}

 

#region INotifyPropertyChanged Members

 

/// <summary>

/// Raised when a property on the contact changes.

/// </summary>

public event PropertyChangedEventHandler PropertyChanged;

 

#endregion

}