C# 隐藏列表视图，直到按下按钮

我有文本框和列表视图，当你按下按钮时 如果列表视图中填充了数据，则当前列表视图位于按钮和文本框下，并且 在你按下按钮后，它总是在那里并且充满了。 有一种方法可以从页面隐藏列表视图，直到您按下按钮并请求数据

public class ModelView
{
    public ModelView()
    {
        GetServiceCollection = new ObservableCollection<string>();
    }

    bool isDataLoaded = false;

    MyCommand goCommand;
    public ICommand GoCommand
    {
        get { return goCommand ?? (goCommand = new MyCommand(() => OnGoCommand(), () => !isDataLoaded)); }
    }

    public ObservableCollection<string> GetServiceCollection { get; set; }

    void OnGoCommand()
    {
        GetServiceCollection.Clear();

        foreach (var item in _configServiceModel.CollectList)
        {
            GetServiceCollection.Add(item);
        }

        isDataLoaded = true;
        goCommand.RaiseCanExecuteChanged();

    }

......

公共类模型视图
{
公共模型视图（）
{
GetServiceCollection=新的ObservableCollection（）；
}
bool isDataLoaded=错误；
MyCommand-goCommand；
公共ICommand命令
{
获取{return goCommand？？（goCommand=new MyCommand（（）=>OnGoCommand（），（）=>！isDataLoaded））；}
}
公共ObservableCollection GetServiceCollection{get；set；}
无效OnGoCommand（）
{
GetServiceCollection.Clear（）；
foreach（配置ServiceModel.CollectList中的变量项）
{
GetServiceCollection.Add（项）；
}
isDataLoaded=true；
goCommand.RaiseCanExecuteChanged（）；
}
......

xaml

<Button Content="Go" Grid.Column="3" Grid.Row="1" HorizontalAlignment="Left"
VerticalAlignment="Top" Width="75" Height="21.96" Command="{Binding GoCommand}"/>

<ListView Grid.Column="2" HorizontalAlignment="Center" Height="230" 
 Margin="5,20,0,0" Grid.Row="2" VerticalAlignment="Top" Width="330" 
 ItemsSource="{Binding GetCollection}" }" >
}

这里最好的选择是在ViewModel上创建另一个属性，将ListView的可见性绑定到该属性。在GoCommand实现中，将此属性设置为visible

作为补充说明，ViewModel未实现INotifyPropertyChanged，因此在更改属性时，您还需要这样做以更新可见性：

private Visibility listViewVisibility;
public Visibility ListViewVisibility
{
    get { return listViewVisibility; }
    set
    {
        if (this.listViewVisibility == value)
            return;

        this.listViewVisibility = value;
        this.OnPropertyChanged("ListViewVisibility");
    }
}

public event PropertyChangedEventHandler PropertyChanged;

protected void OnPropertyChanged(string propertyName)
{
    if(this.PropertyChanged != null)
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}

xaml：

<ListView Grid.Column="2" HorizontalAlignment="Center" Height="230" 
          Margin="5,20,0,0" Grid.Row="2" VerticalAlignment="Top" Width="330" 
          Visibility="{Binding ListViewVisibility}"
          ItemsSource="{Binding GetCollection}" />

我们将加载表单，然后放入“listView1.hide（）”中

然后创建按钮事件

键入“listView1.show（）”

另外，您还可以在c代码中设置所有这些值

视图模型

xaml



FYI-
BooleantVisibilityConverter
默认在WPF中提供。只需声明如下：
。感谢您的帮助！我使用了您的代码及其工作方式，但现在当我单击按钮时，我获得了数据，但按钮已启用。在这种情况下，我应该更改什么？顺便说一句，有一种编写代码的方法除了{return goCommand？？？（goCommand=new MyCommand（（）=>Command（），true））；之外，可能还需要简单的方法？谢谢advance@RohitVats-当我更改为这种类型时，我在RT中遇到了错误，我需要添加一些额外的内容吗？它在MyCommand的第二个参数中不会为true，它将像get{return goCommand？？（goCommand=new MyCommand（）=>Command（），（）=>！isDataLoaded（）；}@Rohit谢谢，巴迪不知道。
public class ConfigModelView:INotifyPropertyChanged
{ 
    public ConfigModelView()
    {
        GetServiceCollection=new ObservableCollection<string>();
    }

    bool isDataLoaded;
    public bool IsDataLoaded
    {
        get { return isDataLoaded; }
        set { isDataLoaded = value; OnPropertyChanged("IsDataLoaded"); }
    }
    MyCommand goCommand;
    public ICommand GoCommand
    {
        get{return goCommand ?? (goCommand=new MyCommand(()=>Command(),()=>!isDataLoaded));}
    }
    public ObservableCollection<string> GetServiceCollection{get;set;}

    void Command()
    {
        foreach (var item in _configServiceModel.CollectList)
        {
            GetServiceCollection.Add(item);
        }

        isDataLoaded = true;
        OnPropertyChanged("IsDataLoaded");
        goCommand.RaiseCanExecuteChanged();
    }


    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class BoolToVisibilityConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is bool)
        {
            if ((bool)value)
                return Visibility.Visible;
            else
                return Visibility.Collapsed;
        }
        return null;
    }

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

<Window x:Class="WpfApplication3.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication3"
    Title="Window1" Height="300" Width="800">
<Window.Resources>
    <local:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/>
</Window.Resources>
<StackPanel>
    <Button Content="Go" Grid.Column="3" Grid.Row="1" HorizontalAlignment="Left"
VerticalAlignment="Top" Width="75" Height="21.96" Command="{Binding GoCommand}"/>

    <ListView Grid.Column="2" HorizontalAlignment="Center" Height="230" 
 Margin="5,20,0,0" Grid.Row="2" VerticalAlignment="Top" Width="330" 
 Visibility="{Binding IsDataLoaded,
Converter= {StaticResource BoolToVisibilityConverter}}"
ItemsSource="{Binding GetCollection}" />
</StackPanel>