[C#/SILVERLIGHT] FrameworkElement 클래스 : BindingValidationError 이벤트 사용하기

■ FrameworkElement 클래스의 BindingValidationError 이벤트를 사용하는 방법을 보여준다.

▶ 예제 코드 (XAML)


<StackPanel
    xmlns:local="clr-namespace:SilverlightApplication1"
    BindingValidationError="stackPanel_BindingValidationError">
    <StackPanel.Resources>
        <local:Bill x:Name="BillKey" />
    </StackPanel.Resources>
    <TextBox x:Name="textBox"
        Margin="10"
        Width="50">
        <TextBox.Text>
            <Binding
                Source="{StaticResource BillKey}"
                Path="Amount"
                Mode="TwoWay"
                ValidatesOnExceptions="true"
                NotifyOnValidationError="true" />
        </TextBox.Text>
    </TextBox>
    <Button
        Width="150"
        Height="50"
        Content="Click To Update Source" />
</StackPanel>

<StackPanel

xmlns:local="clr-namespace:SilverlightApplication1"

BindingValidationError="stackPanel_BindingValidationError">

<StackPanel.Resources>

<local:Bill x:Name="BillKey" />

</StackPanel.Resources>

<TextBox x:Name="textBox"

Margin="10"

Width="50">

<TextBox.Text>

<Binding

Source="{StaticResource BillKey}"

Path="Amount"

Mode="TwoWay"

ValidatesOnExceptions="true"

NotifyOnValidationError="true" />

</TextBox.Text>

</TextBox>

<Button

Width="150"

Height="50"

Content="Click To Update Source" />

</StackPanel>

▶ 예제 코드 (C#)


using System;
using System.Windows.Controls;
using System.Windows.Media;

/// <summary>
/// 청구서
/// </summary>
public class Bill
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Field
    ////////////////////////////////////////////////////////////////////////////////////////// Private

    #region Field

    /// <summary>
    /// 금액
    /// </summary>
    private double amount;

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Property
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 금액 - Amount

    /// <summary>
    /// 금액
    /// </summary>
    public double Amount
    {
        get
        {
            return this.amount;
        }
        set
        {
            if(value < 0d)
            {
                throw new Exception("Amount must be greater than zero.");
            }

            this.amount = value;
        }
    }

    #endregion
}

...

#region 스택 패널 바인딩 무결성 에러 발생시 처리하기 - stackPanel_BindingValidationError(sender, e)

/// <summary>
/// 스택 패널 바인딩 무결성 에러 발생시 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private void stackPanel_BindingValidationError(object sender, ValidationErrorEventArgs e)
{
    if(e.Action == ValidationErrorEventAction.Added)
    {
        this.textBox.Background = new SolidColorBrush(Colors.Red);
    }
    else if(e.Action == ValidationErrorEventAction.Removed)
    {
        this.textBox.Background = new SolidColorBrush(Colors.White);
    }
}

#endregion

using System;

using System.Windows.Controls;

using System.Windows.Media;

/// <summary>

/// 청구서

/// </summary>

public class Bill

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 금액

/// </summary>

private double amount;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 금액 - Amount

/// <summary>

/// 금액

/// </summary>

public double Amount

{

get

{

return this.amount;

}

set

{

if(value < 0d)

{

throw new Exception("Amount must be greater than zero.");

}

this.amount = value;

}

#endregion

}

...

#region 스택 패널 바인딩 무결성 에러 발생시 처리하기 - stackPanel_BindingValidationError(sender, e)

/// <summary>

/// 스택 패널 바인딩 무결성 에러 발생시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void stackPanel_BindingValidationError(object sender, ValidationErrorEventArgs e)

{

if(e.Action == ValidationErrorEventAction.Added)

{

this.textBox.Background = new SolidColorBrush(Colors.Red);

}

else if(e.Action == ValidationErrorEventAction.Removed)

{

this.textBox.Background = new SolidColorBrush(Colors.White);

}

#endregion