WPF复选框绑定

Question

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是微不足道的,但我如何通过数据绑定来完成？我发现的所有示例都从某些数据源更新了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任何指针......

Answer 1

您必须使绑定双向:

<checkbox IsChecked="{Binding Path=MyProperty, Mode=TwoWay}"/>

Answer 2

你需要一个依赖属性:

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));

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}" />

为此,您必须在其openning标记中命名Window或UserControl,并在ElementName参数中使用该名称.

使用此代码,每当您更改代码端的属性时,您将更改文本框.此外,每当您选中/取消选中文本框时,依赖项属性也会更改.

编辑:

创建依赖项属性的一种简单方法是键入代码段propdp,它将为您提供依赖项属性的常规代码.

所有代码:

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#:

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();
        }
    }
}

注意后面唯一的代码是Dependency Property.标签和复选框都绑定到它.如果复选框发生更改,则标签也会更改.

Answer 3

您好,这是我第一次发帖,请耐心等待:我的回答是创建一个简单的属性:

public bool Checked { get; set; }

然后设置Checkbox的数据上下文(称为cb1):

cb1.DataContext = this;

然后在xaml中绑定它的IsChecked proerty

IsChecked="{Binding Checked}"

代码是这样的:

XAML

<CheckBox x:Name="cb1"
          HorizontalAlignment="Left"
          Margin="439,81,0,0"
          VerticalAlignment="Top"
          Height="35" Width="96"
          IsChecked="{Binding Checked}"/>

代码背后

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());
    }
}

Answer 4

应该比那更容易。只需使用：

<Checkbox IsChecked="{Binding Path=myVar, UpdateSourceTrigger=PropertyChanged}" />