我想在c#中连续检查文件夹中是否存在文件

本文关键字：文件夹 是否 存在 文件 检查 连续 | 更新日期: 2023-09-27 18:27:21

我需要在有人将文件放入ftp位置后立即处理该文件我想在windows服务器上创建c#代码

提前感谢

我想在c#中连续检查文件夹中是否存在文件

您需要使用FileSystemWatcher。

using System;
using System.IO;
using System.Security.Permissions;
public class Watcher
{
    public static void Main()
    {
    Run();
    }
    [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];
        /* 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 = "*.txt";
        // 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);
    }
    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);
    }
}

http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher（v=vs.110）.aspxhttp://www.codeproject.com/Articles/26528/C-Application-to-Watch-a-File-or-Directory-using-F

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