silverlight 对ChildWindow返回给父窗体值的理解（转载）

这篇文章是我对ChildWindow的理解，举例说明：

有时候在项目中需要弹出子窗体进行一些操作，然后将操作的值返回到父窗体中。

下图是子窗体的界面（比较粗糙。。。。）

下面贴出其代码：

子窗体前台代码
<controls:ChildWindow x:Class="FineMmarketing.Controls.SelectChild"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
Width="365" Height="226"
Title="请选择纬度">
<Grid x:Name="LayoutRoot" Margin="2" >
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackPanel Margin="0,0,0,37">
<TextBlock Width="100" Height="30" Text="请输入纬度：" Margin="83 35 0 0" HorizontalAlignment="Left" />
<TextBox x:Name="Txt" Width="200" Height="30" HorizontalAlignment="Center" Margin="24 0 0 0"/>
</StackPanel>

<Button x:Name="CancelButton" Content="取消" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0,0" Grid.Row="1" />
<Button x:Name="OKButton" Content="确定" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,79,0" Grid.Row="1" />
</Grid>
</controls:ChildWindow>

子窗体后台代码
/// <summary>
/// 确定按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OKButton_Click(object sender, RoutedEventArgs e)
{
if (!String.IsNullOrEmpty(this.Txt.Text))
{
Regex reg = new Regex("^[0-9]+$");
Match ma = reg.Match(this.Txt.Text.ToString());
if (ma.Success)
{
Num = Convert.ToInt32(this.Txt.Text.ToString());
if (Num > 10)
{
MessageBox.Show("纬度不能超过10！");
return;
}
else
{
this.Tag = Num;
}
}
else
{
MessageBox.Show("请输入正确的纬度！");
}
}
else
{
MessageBox.Show("请输入纬度！");
}
this.DialogResult = true;
}
/// <summary>
/// 取消按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CancelButton_Click(object sender, RoutedEventArgs e)
{
this.DialogResult = false;
}

然后看一下在父窗体中如何调用子窗体，然后后台定义事件执行子窗体关闭事件。

子窗体后台代码
SelectChild myChild = new SelectChild();//申明子窗体对象
////定义子窗体关闭事件
myChild.Closed += new EventHandler(win_Closed);


/// <summary>
/// 子窗口关闭返回值事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void win_Closed(object sender,EventArgs e)
{
bool? result = myChild.DialogResult;
//判断是否是顶级确定按钮关闭并且有返回值
if (result.HasValue && result.Value)
{
//是定义在子窗体中的公有的全局变量
MessageBox.Show(myChild.txt);
}
}