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C# 使用INotifyPropertyChanged在WPF中绑定系统相关信息

c# wpf xaml mvvm

C# 使用INotifyPropertyChanged在WPF中绑定系统相关信息,c#,wpf,xaml,mvvm,inotifypropertychanged,C#,Wpf,Xaml,Mvvm,Inotifypropertychanged,我希望使用MVVM绑定列出WPF XAML中的临时文件，并将INotifyPropertyChanged 视图模型为TempViewModel.cs class TempViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public List<FileInfo> CacheFiles { get

我希望使用MVVM绑定列出WPF XAML中的临时文件，并将
INotifyPropertyChanged

视图模型为TempViewModel.cs

class TempViewModel : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    public List<FileInfo> CacheFiles
    {
        get
        {
            string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
            System.IO.DirectoryInfo di = new DirectoryInfo(path);
            return di.GetFiles().ToList();
        }
    }
}

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Loaded += new RoutedEventHandler(MainWindow_Loaded);
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        this.DataContext = new TempViewModel();
    }
}

class Cleaner : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    private List<KeyValuePair<string, ulong>> _memoryPool = new List<KeyValuePair<string, ulong>>();
    public List<KeyValuePair<string, ulong>> MemoryPool
    {
        get { return _memoryPool; }
        set
        {
            _memoryPool = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("MemoryPool"));
        }
    }


    private void watch()
    {
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Filter = "*.*";
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.EnableRaisingEvents = true;
    }

    private void OnChanged(object source, FileSystemEventArgs e)
    {
        UpdateCollection();
    }

    private void UpdateCollection()
    {
        string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);;
        System.IO.DirectoryInfo di = new DirectoryInfo(path);
        CacheFiles = di.GetFiles().ToList();
    }

    public Cleaner()
    {
        UpdateCollection();
        watch();
    }
}
MainWindow.xaml.cs

class TempViewModel : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    public List<FileInfo> CacheFiles
    {
        get
        {
            string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
            System.IO.DirectoryInfo di = new DirectoryInfo(path);
            return di.GetFiles().ToList();
        }
    }
}

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Loaded += new RoutedEventHandler(MainWindow_Loaded);
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        this.DataContext = new TempViewModel();
    }
}

class Cleaner : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    private List<KeyValuePair<string, ulong>> _memoryPool = new List<KeyValuePair<string, ulong>>();
    public List<KeyValuePair<string, ulong>> MemoryPool
    {
        get { return _memoryPool; }
        set
        {
            _memoryPool = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("MemoryPool"));
        }
    }


    private void watch()
    {
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Filter = "*.*";
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.EnableRaisingEvents = true;
    }

    private void OnChanged(object source, FileSystemEventArgs e)
    {
        UpdateCollection();
    }

    private void UpdateCollection()
    {
        string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);;
        System.IO.DirectoryInfo di = new DirectoryInfo(path);
        CacheFiles = di.GetFiles().ToList();
    }

    public Cleaner()
    {
        UpdateCollection();
        watch();
    }
}
我无法在UI中获取更新的文件名列表。在临时文件夹中添加或删除文件时，请帮助我如何更新UI？

使用
FileSystemWatcher
（）并订阅其中一个事件。在该处理程序中，使用
“CacheFiles”
调用
PropertyChanged
事件，向UI发出重新获取
CacheFiles
属性的信号

您当然可以使用
ObservableCollection
并手动添加/删除条目来改进这一点，但我所描述的方法应该是可行的。

您应该使用FileSystemWatcher和。例如，当FileSystemWatcher引发已更改事件时，事件处理程序应使用引发属性更改来更改CacheFile属性。答案是
FileSystemWatcher

您应该修改您的TempViewModel.cs

class TempViewModel : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    public List<FileInfo> CacheFiles
    {
        get
        {
            string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
            System.IO.DirectoryInfo di = new DirectoryInfo(path);
            return di.GetFiles().ToList();
        }
    }
}

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Loaded += new RoutedEventHandler(MainWindow_Loaded);
    }

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        this.DataContext = new TempViewModel();
    }
}

class Cleaner : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    private List<KeyValuePair<string, ulong>> _memoryPool = new List<KeyValuePair<string, ulong>>();
    public List<KeyValuePair<string, ulong>> MemoryPool
    {
        get { return _memoryPool; }
        set
        {
            _memoryPool = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("MemoryPool"));
        }
    }


    private void watch()
    {
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Filter = "*.*";
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.EnableRaisingEvents = true;
    }

    private void OnChanged(object source, FileSystemEventArgs e)
    {
        UpdateCollection();
    }

    private void UpdateCollection()
    {
        string path = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);;
        System.IO.DirectoryInfo di = new DirectoryInfo(path);
        CacheFiles = di.GetFiles().ToList();
    }

    public Cleaner()
    {
        UpdateCollection();
        watch();
    }
}

类清理器：INotifyPropertyChanged
{
公共事件属性更改事件处理程序属性更改；
私有列表_memoryPool=新列表（）；
公共列表内存池
{
获取{return\u memoryPool；}
设置
{
_memoryPool=值；
如果（PropertyChanged！=null）PropertyChanged（这是新的PropertyChangedEventArgs（“MemoryPool”）；
}
}
私人虚空观察（）
{
FileSystemWatcher watcher=新的FileSystemWatcher（）；
watcher.Path=Environment.GetFolderPath（Environment.SpecialFolder.InternetCache）；
watcher.NotifyFilter=NotifyFilters.LastWrite；
watcher.Filter=“***”；
watcher.Changed+=新文件系统EventHandler（OnChanged）；
watcher.EnableRaisingEvents=true；
}
私有void OnChanged（对象源、文件系统目标）
{
UpdateCollection（）；
}
私有void UpdateCollection（）
{
字符串路径=Environment.GetFolderPath（Environment.SpecialFolder.InternetCache）；；
System.IO.DirectoryInfo di=新的DirectoryInfo（路径）；
CacheFiles=di.GetFiles（）.ToList（）；
}
公共清洁工（）
{
UpdateCollection（）；
手表（）；
}
}
请您详细说明一下代码，两分钟内您得到了两个非常相似的答案。这表明，这不是很难做到。我不会提供全部代码。我建议您阅读
INotifyCollectionChanged
界面，然后自己尝试！请你详细说明一下代码好吗？