如何在C#WPF中选中/取消选中列表框中的所有复选框? [英] How Can I Check/UnCheck All Checkboxes in Listbox in C# WPF?

问题描述

我有一个 ListBox ，其中包含 DataTemplate 中的复选框，我有两个按钮"Select All"和"UnSelect All".通过单击选择和取消选择按钮取消全部选中，我想实现 INotifyPropertyChanged 进行分类.我该怎么办?

I have a ListBox contains checkboxes in DataTemplate and I have two buttons "Select All" and "UnSelect All".I want to make that checkboxes to check all and uncheck all with clicking select and unselect buttons and I want to implement INotifyPropertyChanged to class. How Can I do that things?

谢谢您的回答.

XAML代码

  <StackPanel>
        <ListBox Name="lstUserDefination" 
 ScrollViewer.VerticalScrollBarVisibility="Auto" SelectionMode="Multiple">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <ListBoxItem>
                    <CheckBox Name="chkUser" Content="{Binding AuthorityName}"/>
                    </ListBoxItem>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </StackPanel>

C#代码

   public partial class UserDefinationEdit : Window
{
    public ObservableCollection<Authority> authorityList { get; set; }

    public UserDefinationEdit()
    {
        InitializeComponent();
        CreateCheckBoxList();
        lstUserDefination.ItemsSource = authorityList;
    }


    private void Window_MouseDown(object sender, MouseButtonEventArgs e)
    {
        if (e.LeftButton == MouseButtonState.Pressed)
        {
            DragMove();
        }
    }

    public void CreateCheckBoxList()
    {
        authorityList = new ObservableCollection<Authority>();

        authorityList.Add(new Authority() {AuthorityValue = 0, AuthorityName = "0 - " });
        authorityList.Add(new Authority() { AuthorityValue = 1, AuthorityName = "1 - " });
        authorityList.Add(new Authority() { AuthorityValue = 2, AuthorityName = "2 - " });
        authorityList.Add(new Authority() { AuthorityValue = 3, AuthorityName = "3 - " });
        authorityList.Add(new Authority() { AuthorityValue = 4, AuthorityName = "4 - " });
        authorityList.Add(new Authority() { AuthorityValue = 5, AuthorityName = "5 - " });
        authorityList.Add(new Authority() { AuthorityValue = 6, AuthorityName = "6 - " });


        this.DataContext = this;
    }

    private void btnUnselectall_Click(object sender, RoutedEventArgs e)
    {
        lstUserDefination.UnselectAll();
    }

    private void btnSelectAll_Click(object sender, RoutedEventArgs e)
    {
        lstUserDefination.SelectAll();
    }

}
public class Authority
{
    public string AuthorityName { get; set; }
    public int AuthorityValue { get; set; }
    public bool IsChecked { get; set; }
}
}

推荐答案

为 ListBoxItem 模板中的 IsChecked 属性添加绑定

Add binding for IsChecked property in ListBoxItem template

<CheckBox Name="chkUser" Content="{Binding AuthorityName}" IsChecked="{Binding IsChecked}"/>

并将按钮处理程序更改为

And change your button handlers to

private void btnUnselectall_Click(object sender, RoutedEventArgs e)
{
    foreach (var a in authorityList)
    {
        a.IsChecked = false;
    }
}

private void btnSelectAll_Click(object sender, RoutedEventArgs e)
{
    foreach (var a in authorityList)
    {
        a.IsChecked = true;
    }
}

请注意，您的 Authority 类应实现 INotifyPropertyChanged 才能使此项工作.

Note that your Authority class should implement INotifyPropertyChanged to make this work.

public class Authority : INotifyPropertyChanged
{
    private string authorityName;
    private int authorityValue;
    private bool isChecked;

    public string AuthorityName
    {
        get { return authorityName; }
        set
        {
            authorityName = value;
            NotifyPropertyChanged();
        }
    }

    public int AuthorityValue
    {
        get { return authorityValue; }
        set
        {
            authorityValue = value;
            NotifyPropertyChanged();
        }
    }

    public bool IsChecked
    {
        get { return isChecked; }
        set
        {
            isChecked = value;
            NotifyPropertyChanged();
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(string propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

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