WPF CheckBox(IsThreeState ="True") [英] WPF CheckBox ( IsThreeState="True" )

问题描述

大家好，

我的应用程序中有一个CheckBox作为WPF Datagrid HeaderTemplate.我的应用程序基本上是一个电子邮件收件箱应用程序，因为我需要处理CheckBox的ThreeState.

1.如果已进行IsChecked，则需要在Datagrid中选择一些项(例如未读)
2.如果未选中，我需要在Datagrid中选择一些项目(例如Readed)
3.如果ThreeState我需要在Datagrid中选择一些项(例如Junk)

这是我的演示项目代码

Xaml代码

Hi all,

I have a CheckBox as a WPF Datagrid HeaderTemplate in my application. my application is basically a Email Inbox Application in that i need to handle ThreeState of CheckBox.

1. if IsChecked i need to select some items in the Datagrid (say UnReaded)
2. If UnChecked i need to select some items in the Datagrid (say Readed)
3. if ThreeState i need to select some items in the Datagrid (say Junk)

this is my Demo project code

Xaml Code

<Window x:Class="WPF_TEST.MainDisplayWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WPF_TEST"

        mc:Ignorable="d" 

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

        x:Name="WindowDisplay"

        d:DesignHeight="414" d:DesignWidth="660" >
    <Grid>
        <DataGrid AutoGenerateColumns="False" Height="250" HorizontalAlignment="Left" Margin="93,58,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="469" >
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.HeaderTemplate>
                        <DataTemplate>
                            <CheckBox Content="Type" x:Name="chkHeader" IsChecked="{Binding ElementName=WindowDisplay, Path=IsHeaderSelected, Mode=TwoWay}"  IsThreeState="True" />
                        </DataTemplate>
                    </DataGridTemplateColumn.HeaderTemplate>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding ElementName=WindowDisplay, Path=IsHeaderSelected, Mode=TwoWay}" Content="{Binding Name}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

背后的代码

Code Behind

namespace WPF_TEST
{
    /// <summary>
    /// Interaction logic for MainDisplayWindow.xaml
    /// </summary>
    public partial class MainDisplayWindow : Window
    {

        public bool? IsHeaderSelected
        {
            get { return (bool?)GetValue(IsHeaderSelectedProperty); }
            set { SetValue(IsHeaderSelectedProperty, value); }
        }
        // Using a DependencyProperty as the backing store for IsHeaderSelected.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IsHeaderSelectedProperty =
            DependencyProperty.Register("IsHeaderSelected", typeof(bool?), typeof(MainDisplayWindow), new UIPropertyMetadata(null));
        
        public MainDisplayWindow()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainDisplayWindow_Loaded);
        }
        void MainDisplayWindow_Loaded(object sender, RoutedEventArgs e)
        {
            MyClassData res = new MyClassData();
            dataGrid1.ItemsSource = res;
        }
    }
    public class MyClass : List<MyClass>
    {
        public string Name { get; set; }
        public MyClass()
        {
        }
    }
    public class MyClassData : List<MyClass>
    {
        public MyClassData()
        {
            this.Add(new MyClass { Name = "Readed" });
            this.Add(new MyClass { Name = "UnReaded" });
            this.Add(new MyClass { Name = "Junk" });
        }
    }
}

任何人都有任何想法.

any one have any Idea.

推荐答案

我在stackoverflow中发现了此链接，可能对您有用.

链接

I found this link in stackoverflow which might be useful for you.

Link

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