C# WPF 复选框绑定
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原文地址: http://stackoverflow.com/questions/870163/
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WPF checkbox binding
提问by Number8
While it is trivial to store a checkbox's checked state in a variable using the checkbox's Click event, how would I do it via databinding? All the examples I have found have the UI updated from some datasource, or bind one control to another; I want to update a member variable when the checkbox is clicked.
虽然使用复选框的 Click 事件将复选框的选中状态存储在变量中很简单，但我将如何通过数据绑定来做到这一点？我发现的所有示例都从某个数据源更新了 UI，或者将一个控件绑定到另一个控件；我想在单击复选框时更新成员变量。
TIA for any pointers...
任何指针的 TIA...
采纳答案by Carlo
You need a dependency property for this:
为此，您需要一个依赖属性：
public BindingList<User> Users
{
get { return (BindingList<User>)GetValue(UsersProperty); }
set { SetValue(UsersProperty, value); }
}
public static readonly DependencyProperty UsersProperty =
DependencyProperty.Register("Users", typeof(BindingList<User>),
typeof(OptionsDialog));
Once that is done, you bind the checkbox to the dependency property:
完成后，将复选框绑定到依赖项属性：
<CheckBox x:Name="myCheckBox"
IsChecked="{Binding ElementName=window1, Path=CheckBoxIsChecked}" />
For that to work you have to name your Window or UserControl in its openning tag, and use that name in the ElementName parameter.
为此，您必须在其开始标记中命名 Window 或 UserControl，并在 ElementName 参数中使用该名称。
With this code, whenever you change the property on the code side, you will change the textbox. Also, whenever you check/uncheck the textbox, the Dependency Property will change too.
使用此代码，无论何时更改代码端的属性，都会更改文本框。此外，每当您选中/取消选中文本框时，依赖属性也会发生变化。
EDIT:
编辑：
An easy way to create a dependency property is typing the snippet propdp, which will give you the general code for Dependency Properties.
创建依赖属性的一种简单方法是键入代码片段 propdp，它将为您提供依赖属性的通用代码。
All the code:
所有代码：
XAML:
XAML：
<Window x:Class="StackOverflowTests.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" x:Name="window1" Height="300" Width="300">
<Grid>
<StackPanel Orientation="Vertical">
<CheckBox Margin="10"
x:Name="myCheckBox"
IsChecked="{Binding ElementName=window1, Path=IsCheckBoxChecked}">
Bound CheckBox
</CheckBox>
<Label Content="{Binding ElementName=window1, Path=IsCheckBoxChecked}"
ContentStringFormat="Is checkbox checked? {0}" />
</StackPanel>
</Grid>
</Window>
C#:
C＃：
using System.Windows;
namespace StackOverflowTests
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{
public bool IsCheckBoxChecked
{
get { return (bool)GetValue(IsCheckBoxCheckedProperty); }
set { SetValue(IsCheckBoxCheckedProperty, value); }
}
// Using a DependencyProperty as the backing store for
//IsCheckBoxChecked. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsCheckBoxCheckedProperty =
DependencyProperty.Register("IsCheckBoxChecked", typeof(bool),
typeof(Window1), new UIPropertyMetadata(false));
public Window1()
{
InitializeComponent();
}
}
}
Notice how the only code behind is the Dependency Property. Both the label and the checkbox are bound to it. If the checkbox changes, the label changes too.
注意背后的唯一代码是依赖属性。标签和复选框都绑定到它。如果复选框更改，标签也会更改。
回答by Muad'Dib
if you have the property "MyProperty" on your data-class, then you bind the IsChecked like this.... (the converter is optional, but sometimes you need that)
如果您的数据类具有“MyProperty”属性，那么您可以像这样绑定 IsChecked....（转换器是可选的，但有时您需要它）
<Window.Resources>
<local:MyBoolConverter x:Key="MyBoolConverterKey"/>
</Window.Resources>
<checkbox IsChecked="{Binding Path=MyProperty, Converter={StaticResource MyBoolConverterKey}}"/>
回答by Thomas Levesque
You must make your binding bidirectional :
您必须使您的绑定双向：
<checkbox IsChecked="{Binding Path=MyProperty, Mode=TwoWay}"/>
回答by ElMatador
Here is a post that shows an example of simple data binding to a IsChecked property of a two check boxes, which are mutually exclusive.
这是一篇文章，展示了一个简单数据绑定到两个复选框的 IsChecked 属性的示例，这两个复选框是互斥的。
Hope that helps.
希望有帮助。
回答by Tim W
Should be easier than that. Just use:
应该比那容易。只需使用：
<Checkbox IsChecked="{Binding Path=myVar, UpdateSourceTrigger=PropertyChanged}" />
回答by abraham camhy
Hello this is my first time posting so please be patient: my answer was to create a simple property:
您好，这是我第一次发帖，所以请耐心等待：我的回答是创建一个简单的属性：
public bool Checked { get; set; }
Then to set the data context of the Checkbox (called cb1):
然后设置复选框的数据上下文（称为 cb1）：
cb1.DataContext = this;
Then to bind the IsChecked proerty of it in the xaml
然后在 xaml 中绑定它的 IsChecked 属性
IsChecked="{Binding Checked}"
The code is like this:
代码是这样的：
XAML
XAML
<CheckBox x:Name="cb1"
HorizontalAlignment="Left"
Margin="439,81,0,0"
VerticalAlignment="Top"
Height="35" Width="96"
IsChecked="{Binding Checked}"/>
Code behind
背后的代码
public partial class MainWindow : Window
{
public bool Checked { get; set; }
public MainWindow()
{
InitializeComponent();
cb1.DataContext = this;
}
private void myyButton_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show(Checked.ToString());
}
}
回答by pjm
This works for me (essential code only included, fill more for your needs):
这对我有用（仅包含基本代码，根据您的需要填写更多）：
In XAML a user control is defined:
在 XAML 中定义了一个用户控件：
<UserControl x:Class="Mockup.TestTab" ......>
<!-- a checkbox somewhere within the control -->
<!-- IsChecked is bound to Property C1 of the DataContext -->
<CheckBox Content="CheckBox 1" IsChecked="{Binding C1, Mode=TwoWay}" />
</UserControl>
In code behind for UserControl
在 UserControl 背后的代码中
public partial class TestTab : UserControl
{
public TestTab()
{
InitializeComponent(); // the standard bit
// then we set the DataContex of TestTab Control to a MyViewModel object
// this MyViewModel object becomes the DataContext for all controls
// within TestTab ... including our CheckBox
DataContext = new MyViewModel(....);
}
}
Somewhere in solution class MyViewModel is defined
在解决方案类 MyViewModel 中的某处定义了
public class MyViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private bool m_c1 = true;
public bool C1 {
get { return m_c1; }
set {
if (m_c1 != value) {
m_c1 = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("C1"));
}
}
}
}
