Question

我有checkbox绑定到对象的属性“IsValidCustomer”，我有一个listview来容纳一些客户。每当我的用户选择列表中的任何Customer时，我希望Checkbox Checked属性设置为False，这意味着我的“IsValidCustomer”属性也会设置自动到False。有没有办法使用WPF绑定实现这一点？

在这方面的任何帮助都会受到高度关注。

此致

-Srikanth

Answer 1

首先确保您的观点Datacontext设置为实现viewmodel INotifyPropertyChanged的{{1}}，然后添加interface属性保留SelectedCustomer，

Customer

每次设置ListView时，请检查其值并设置SelectedCustomer属性这里是完整的代码：

视图模型

IsValidCustomer

和视图

 public class Customer
{
    public String Name { get; set; }
    public String Id { get; set; }
}
public partial class MainWindow : Window, INotifyPropertyChanged
{
    private Customer _selectedCustomer;
    public Customer SelectedCustomer
    {
        get
        {
            return _selectedCustomer;
        }

        set
        {
            if (_selectedCustomer == value)
            {
                return;
            }

            _selectedCustomer = value;
            OnPropertyChanged();
            IsValidCustomer = (_selectedCustomer == null);

        }
    }
    private ObservableCollection<Customer> _listCustomers;
    public ObservableCollection<Customer> ListCustomers
    {
        get
        {
            return _listCustomers;
        }

        set
        {
            if (_listCustomers == value)
            {
                return;
            }

            _listCustomers = value;
            OnPropertyChanged();
        }
    }
    private bool _isValidCustomer = false;
    public bool IsValidCustomer
    {
        get
        {
            return _isValidCustomer;
        }

        set
        {
            if (_isValidCustomer == value)
            {
                return;
            }

            _isValidCustomer = value;
            OnPropertyChanged();
        }
    }
    public MainWindow()
    {
        InitializeComponent();
    }

    public event PropertyChangedEventHandler PropertyChanged;

    [NotifyPropertyChangedInvocator]
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}

Answer 2

我相信你的模型中有这样的东西：

     private bool _IsValidCustomer;

    public bool IsValidCustomer
    {
        get { return _IsValidCustomer; }
        set
        {
            _IsValidCustomer= value;
            PropertyChanged(this, new PropertyChangedEventArgs("IsValidCustomer"));
        }
    }

为该bool属性设置Binding。

            <Style TargetType="ListViewItem">
                <Setter Property="IsSelected" Value="{Binding IsValidCustomer, Converter={StaticResource InverseBooleanConverter}}"/>
            </Style>

您的CheckBox也将受此限制：

<CheckBox IsChecked="{Binding IsValidCustomer, Mode=TwoWay}"/>

所以，我假设您从IsValidCustomer设置为true开始。在选择每一行时，您需要将其设置为false。

你需要一个反布尔转换器：

public class InverseBooleanConverter: IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter,
        System.Globalization.CultureInfo culture)
    {
        if (targetType != typeof(bool))
            throw new InvalidOperationException("The target must be a boolean");

        return !(bool)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
        System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }

    #endregion
}

绑定到属性和元素值 - WPF绑定

2 个答案: