在企业级项目中，子窗口(ChildWindow)是一个常用控件，其展示方式是以弹出窗口来显示信息。 这里我将演示，子窗口传递参数到父窗口的方法。由于我的开发环境都是英文环境，所以部分中文可能显示不正常，请大家见谅。
private
ChildWindowDemo childWindowDemo
=
new
ChildWindowDemo();
我们的目的是希望用户在子窗口输入一串文字，然后点击提交后，字符串将被返回显示在父窗口。
1. 首先创建一个新项目 “SLChildWindow",
2. 然后在新项目中,右键点击添加，添加一个新项目，选择“子窗口”（ChildWindow), 改名为"ChildWindowDemo.xaml",添加完成后，在子窗口中添加一个文本框，名为 txtUserInfo,
1
<
controls:ChildWindow
x:Class
="SLChildWindow.ChildWindowDemo"
2 xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3 xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"
4 xmlns:controls
="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
5 Width
="400"
Height
="300"
6 Title
="ChildWindowDemo"
>
7
<
Grid
x:Name
="LayoutRoot"
Margin
="2"
>
8
<
Grid.RowDefinitions
>
9
<
RowDefinition
/>
10
<
RowDefinition
Height
="Auto"
/>
11
</
Grid.RowDefinitions
>
12
13
<
TextBox
x:Name
="txtUserInfor"
Grid.Row
="0"
/>
14
15
<
Button
x:Name
="CancelButton"
Content
="Cancel"
Click
="CancelButton_Click"
Width
="75"
Height
="23"
HorizontalAlignment
="Right"
Margin
="0,12,0,0"
Grid.Row
="1"
/>
16
<
Button
x:Name
="OKButton"
Content
="OK"
Click
="OKButton_Click"
Width
="75"
Height
="23"
HorizontalAlignment
="Right"
Margin
="0,12,79,0"
Grid.Row
="1"
/>
17
</
Grid
>
18
</
controls:ChildWindow
>
<
controls:ChildWindow
x:Class
="SLChildWindow.ChildWindowDemo"
2
xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3
xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"
4
xmlns:controls
="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
5
Width
="400"
Height
="300"
6
Title
="ChildWindowDemo"
>
7
<
Grid
x:Name
="LayoutRoot"
Margin
="2"
>
8
<
Grid.RowDefinitions
>
9
<
RowDefinition
/>
10
<
RowDefinition
Height
="Auto"
/>
11
</
Grid.RowDefinitions
>
12
13
<
TextBox
x:Name
="txtUserInfor"
Grid.Row
="0"
/>
14
15
<
Button
x:Name
="CancelButton"
Content
="Cancel"
Click
="CancelButton_Click"
Width
="75"
Height
="23"
HorizontalAlignment
="Right"
Margin
="0,12,0,0"
Grid.Row
="1"
/>
16
<
Button
x:Name
="OKButton"
Content
="OK"
Click
="OKButton_Click"
Width
="75"
Height
="23"
HorizontalAlignment
="Right"
Margin
="0,12,79,0"
Grid.Row
="1"
/>
17
</
Grid
>
18
</
controls:ChildWindow
>
3. 在子窗口后台代码中创建一个字符串类型的属性，该属性将用来保存用户输入的字符串，
1
string
testString;
2
3
public
string
TestString
4
5
{
6
7
get {return testString;}
8
9 set { testString = value; }
10
11
}
12
string
testString;2
3
public
string
TestString4
5
{6
7
get {return testString;}8
9
set { testString = value; }10
11
}
12
4. 在子窗口中，建立一个EventHandler，父窗口将用该事件控制器获取子窗口参数，
1
public
event
EventHandler OkClicked;
public
event
EventHandler OkClicked;
5. 当前，在子窗口有两个按钮，一个是Ok按钮，一个是Cancel按钮，后台有两个按钮事件OKButton_Click，CancelButton_Click； 在OKButton_Click中调用前面我们定义的时间控制器OkClicked，
1
private
void
OKButton_Click(
object
sender, RoutedEventArgs e)
2
{
3 if (OkClicked != null)
4 {
5 TestString = txtUserInfor.Text;
6 OkClicked(this, new EventArgs());
7
}
8 this.DialogResult = true;
9 }
private
void
OKButton_Click(
object
sender, RoutedEventArgs e)2
{3
if (OkClicked != null)4
{5
TestString = txtUserInfor.Text;6
OkClicked(this, new EventArgs());7
}8
this.DialogResult = true;9
}
6. 在父窗口MainPage.xaml中建立一个子窗口的实例，方便父窗口调用子窗口，
private
ChildWindowDemo childWindowDemo
=
new
ChildWindowDemo();
7. 在父窗口MainPage.xaml中调用子窗口的OkClicked事件，
1
public
MainPage()
2
{
3 InitializeComponent();
4 childWindowDemo.OkClicked += new EventHandler(childWindowDemo_OkClicked);
5 }
6
7
private
void
childWindowDemo_OkClicked(
object
sender, EventArgs e)
8
{
9 tbInfo.Text = childWindowDemo.TestString;
10 }
11
12
private
void
btPopup_Click(
object
sender, RoutedEventArgs e)
13
{
14 childWindowDemo.Show();
15 }
16
public
MainPage()2
{3
InitializeComponent();4
childWindowDemo.OkClicked += new EventHandler(childWindowDemo_OkClicked);5
}
6
7
private
void
childWindowDemo_OkClicked(
object
sender, EventArgs e)8
{9
tbInfo.Text = childWindowDemo.TestString;10
}
11
12
private
void
btPopup_Click(
object
sender, RoutedEventArgs e)13
{14
childWindowDemo.Show();15
}
16
8. 最后通过子窗口属性获取子窗口用户输入信息。
本文转自 冷秋寒 51CTO博客，原文链接：http://blog.51cto.com/kevinfan/235003 ，如需转载请自行联系原作者
