[WPSL]将多个控件绑定到WP8 MVVM中的单个控件

问题描述

您好，

   我正在使用MVVMLight开发WP8应用程序。我有4个单选按钮和一个文本框。我希望文本框对于前两个单选按钮应该是可见的，对于其余按钮它应该是不可见的。我该怎么做？

   I am develeoping WP8 app using MVVMLight. I have 4 radio buttons and one textbox. I want textbox should be visible for first two radio buttons and for rest of the buttons it should not be visible.How should I do that?

Amol Gandhi

Amol Gandhi

推荐答案

>> 我想要textbox应该对于前两个单选按钮是可见的，对于其余的按钮，它不应该是可见的。我该怎么做？

我想知道你是否想让TextBox可见当点击前两个RadioButtons中的一个时，如果是这样，你需要使用双向数据绑定，之后你需要更新你的DataSource以显示更新，我已经创建了以下
示例，请尝试检查它：

在MainPage.xaml中：

I wonder if you want to make the TextBox visible when the one of the first two RadioButtons are clicked, if so you need to use the Two-Way data binding, after that you need to update your DataSource to show the update, I have created the following example, please try to check it:
In the MainPage.xaml:

 <ListBox Name="MyListBox">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Tap="StackPanel_Tap" Orientation="Vertical" Background="Red">
                            <RadioButton Content="RadioButton1" IsChecked="{Binding IsChecked1,Mode=TwoWay}"></RadioButton>
                            <RadioButton Content="RadioButton2" IsChecked="{Binding IsChecked2,Mode=TwoWay}"></RadioButton>
                            <RadioButton Content="RadioButton3" IsChecked="{Binding IsChecked3,Mode=TwoWay}"></RadioButton>
                            <RadioButton Content="RadioButton4" IsChecked="{Binding IsChecked4,Mode=TwoWay}"></RadioButton>
                            <TextBox Text="I am showing" Visibility="{Binding Visible,Mode=TwoWay}"></TextBox>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

在MainPage.xaml.cs中：

In the MainPage.xaml.cs:

  public class modelclass:INotifyPropertyChanged
    {
    private bool _IsChecked1;
    private bool _IsChecked2;
    private bool _IsChecked3;
    private bool _IsChecked4;
    private Visibility _Visible;



    public bool IsChecked1
    {
        get { return _IsChecked1; }
        set
        {
            if (value == _IsChecked1) return;
            _IsChecked1 = value;
            OnPropertyChanged("IsChecked1");
        }
    }
    public bool IsChecked2
    {
        get { return _IsChecked2; }
        set
        {
            if (value == _IsChecked2) return;
            _IsChecked2 = value;
            OnPropertyChanged("IsChecked2");
        }
    }
  public bool IsChecked3
    {
        get { return _IsChecked3; }
        set
        {
            if (value == _IsChecked3) return;
            _IsChecked3 = value;
            OnPropertyChanged("IsChecked3");
        }
    }
  public bool IsChecked4
    {
        get { return _IsChecked4; }
        set
        {
            if (value == _IsChecked4) return;
            _IsChecked4 = value;
            OnPropertyChanged("IsChecked4");
        }
    }
  public Visibility Visible
    {
        get { return _Visible; }
        set
        {
            if (value == _Visible) return;
            _Visible = value;
            OnPropertyChanged("Visible");
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName = null)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }


}


    public partial class MainPage : PhoneApplicationPage
    {
        public ObservableCollection<modelclass> myModelList;
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            myModelList=new ObservableCollection<modelclass>();
            for(int i=0;i<5;i++)
            {
                myModelList.Add(new modelclass()
                {
                    IsChecked1 = false,
                    IsChecked2 = false,
                    IsChecked3 = false,
                    IsChecked4 = false,
                    Visible = Visibility.Collapsed
                });

            }
            MyListBox.ItemsSource = myModelList;

        }
        private void StackPanel_Tap(object sender, GestureEventArgs e)
        {
            foreach (var modelclass in myModelList)
            {
                if (modelclass.IsChecked1 == true || modelclass.IsChecked2 == true)
                {
                    modelclass.Visible = Visibility.Visible;
                }

                else modelclass.Visible=Visibility.Collapsed;
            }
            MyListBox.ItemsSource = myModelList;
        }
    }

最好的问候，

Amy Peng

Best Regards,
Amy Peng

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