File Watcher 和 File.copy 程序混乱

Question

你好 Stack Overflow 社区，我仍在学习 C# 的基础知识，需要一些指导。我在 Microsoft 网站上阅读了很多 material，也阅读了 Stack Overflow，但没有找到解决方案。我的问题是我正在尝试设置我的 File Watcher 程序，以便在添加新文件时，它们不会被覆盖到目标目录中，而是被添加。看来我只能在目标目录中创建一个文件，而创建的任何其他新文件都被覆盖了。

我的另一个挑战是反映在目标目录中创建的文件。例如，如果我创建一个空白的 .bmp 文件，目标目录将默认添加一个 "whatever.txt" 文件。我在下面粘贴了我的代码，欢迎任何想法。非常感谢 SO 社区。

using System;
using System.IO;
using System.Security.Permissions;


namespace Generac_fileWatcher
{


public class FileWatcher
{
    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
    public static void Run()
    {
        //string[] args = System.Environment.GetCommandLineArgs();

        //// If a directory is not specified, exit program.
        //if (args.Length != 2)
        //{
        //    // Display the proper way to call the program.
        //    Console.WriteLine("Usage: Watcher.exe (directory)");
        //    return;
        //}

        // Create a new FileSystemWatcher and set its properties.
        FileSystemWatcher watcher = new FileSystemWatcher();
        //watcher.Path = args[1];
        watcher.Path = @"C:\Users\mterpeza\Documents\visual studio 2012\Projects\Generac_fileWatcher\Generac_fileWatcher\FilesToWatch";
        /* Watch for changes in LastAccess and LastWrite times, and
           the renaming of files or directories. */
        watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;
        // Only watch text files.
        watcher.Filter = ""; 

        // Add event handlers.
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.Created += new FileSystemEventHandler(OnChanged);
        watcher.Deleted += new FileSystemEventHandler(OnChanged);
        watcher.Renamed += new RenamedEventHandler(OnRenamed);

        // Begin watching.
        watcher.EnableRaisingEvents = true;

        // Wait for the user to quit the program.
        Console.WriteLine("Press \'q\' to quit the sample.");
        while (Console.Read() != 'q') ;
    }

    // Define the event handlers.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        // Specify what is done when a file is changed, created, or deleted.
        Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
        File.Copy(e.FullPath, @"C:\Users\mterpeza\Documents\Visual Studio 2012\Projects\Generac_fileWatcher\Generac_fileWatcher\SyncedDirectory\whatever.txt", true);
    }

    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        // Specify what is done when a file is renamed.
        Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
    }
}
}

Answer 1

您正在对复制文件的文件名进行硬编码。

File.Copy(e.FullPath, @"C:\Users\mterpeza\Documents\Visual Studio 2012\Projects\Generac_fileWatcher\Generac_fileWatcher\SyncedDirectory\whatever.txt", true);

所有文件将被复制为 SyncedDirectory 中的 'whatever.txt'，这意味着第一个文件之后的所有文件都将被覆盖，因为目录中只能有一个具有给定名称的文件。如果您希望复制的文件使用自己的名称，您应该改为执行以下操作。

//note that targetDirectory does NOT contain 'whatever.txt'
var targetDirectory = @"C:\Users\mterpeza\Documents\Visual Studio 2012\Projects\Generac_fileWatcher\Generac_fileWatcher\SyncedDirectory\";
var targetPath = Path.Combine(targetDirectory, e.Name);
File.Copy(e.FullPath, targetPath, true);

这样，每个文件在复制时都会保留其名称，但仍会转到您指定的目录。

File Watcher 和 File.copy 程序混乱

File Watcher, and File.copy program confusion

c#

visual-studio

file-copying

file-watcher