Question

我正在构建一个应用程序，我将在那里观看文件。我在编程方面很新鲜，所以我（也许）没有什么问题，因为我没有一些真正的实践。我的程序工作，但我不知道如何在“真正的”软件中实现。请概述和评论。因为我喜欢在DateFiles类中尽可能多地使用，而在MainViewModel中可能更少。是基于MVVM基础构建的应用程序。

我的现状：

在我的MainViewModel

中

public static string ConfigurationFilesSourcePath2;

private void InitializeFiles()
{
    // New instance of DateFiles
    DF = new DataFiles();

    // Path to DateFiles
    DF.ConfigurationFilesSourcePath = ConfigurationFilesSourcePath;

    // Run Initialization method to establish "filewatching"
    DF.InitializeFiles();

    // Refresh ListView in View
    RefreshFileList();

    // Assign a Handler to PropertyChanged event
    DF.PropertyChanged += DF_PropertyChanged;
}

// If something change inside DateFiles
private void DF_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    RefreshFileList();
}

// Refresh file list
public void RefreshFileList()
{
    fileslist = new ObservableCollection<Files>();

    foreach (var item in DF.fileslist)
    {
        fileslist.Add(item);
    }

    NotifyPropertyChanged("fileslist");
}

DataFiles类：

 public class DataFiles : ViewModelBase
 {
public FileSystemWatcher filewatcher;
public string ConfigurationFilesSourcePath;
public ObservableCollection<Files> fileslist { get; set; } = new ObservableCollection<Files>();

public void InitializeFiles()
{
    // Create a new FileSystemWatcher
    filewatcher = new FileSystemWatcher();

    // Set filter to only catch XAL files
    filewatcher.Filter = "*.txt";

    // Set the path
    filewatcher.Path = ConfigurationFilesSourcePath;

    // Subscribe to the Created event
    filewatcher.Created += new FileSystemEventHandler(FileOnchanged);
    filewatcher.Changed += new FileSystemEventHandler(FileOnchanged);
    filewatcher.Deleted += new FileSystemEventHandler(FileOnchanged);
    filewatcher.Renamed += new RenamedEventHandler(FileOnRenamed);

    // Enable the FileSystemWatcher events
    filewatcher.EnableRaisingEvents = true;

    RefreshFilesList();
}

private void FileOnchanged(object sender, FileSystemEventArgs e)
{
    RefreshFilesList();
}

private void FileOnRenamed(object sender, RenamedEventArgs e)
{
    RefreshFilesList();
}

public void RefreshFilesList()
{
    fileslist.Clear();

    DirectoryInfo dir = new DirectoryInfo(ConfigurationFilesSourcePath);

    string[] extensions = new[] { ".txt" };

    int nof = 0;
    foreach (FileInfo file in dir.GetFiles().Where(f => extensions.Contains(f.Extension.ToLower())).ToArray())
    {
        nof++;

        fileslist.Add(new Files()
        {
            FileId = nof,
            FileName = file.Name,
            FileChanged = file.LastWriteTime.ToString(),
            FileCreated = file.CreationTime.ToString(),
            OnlyNameWithoutExtension = Path.GetFileNameWithoutExtension(file.Name)
        });
        NotifyPropertyChanged("fileslist");
    }
}

Answer 1

您的代码存在一些问题。在最重要的部分中 - 您在每次更改时重建整个文件列表（而FileSystemEventArgs参数为您提供有关实际更改的内容和位置的信息），并且您不在UI线程上更新ObservableCollection。请查看以下代码（但请记住，这只是一个示例，供您发现一些问题）：

FileWatcher的典型实现？

1 个答案: