使用C#,如何删除目录中的所有文件和文件夹,但仍然保留根目录?


当前回答

using System.IO;

string[] filePaths = Directory.GetFiles(@"c:\MyDir\");

foreach (string filePath in filePaths)

File.Delete(filePath);

其他回答

下面的示例显示了如何做到这一点。它首先创建一些目录和文件,然后通过Directory.Delete(topPath,true);:

    static void Main(string[] args)
    {
        string topPath = @"C:\NewDirectory";
        string subPath = @"C:\NewDirectory\NewSubDirectory";

        try
        {
            Directory.CreateDirectory(subPath);

            using (StreamWriter writer = File.CreateText(subPath + @"\example.txt"))
            {
                writer.WriteLine("content added");
            }

            Directory.Delete(topPath, true);

            bool directoryExists = Directory.Exists(topPath);

            Console.WriteLine("top-level directory exists: " + directoryExists);
        }
        catch (Exception e)
        {
            Console.WriteLine("The process failed: {0}", e.Message);
        }
    }

它取自https://msdn.microsoft.com/en-us/library/fxeahc5f(v=vs.110).aspx。

在我的情况下

var PhotoFile = _context.Records.Where(x => id_or_ids.Contains(x.Id)).Select(x => x.Photo).ToList();

            System.IO.DirectoryInfo di = new DirectoryInfo("wwwroot/uploads");

            foreach (FileInfo file in di.GetFiles())
            {
                if (PhotoFile.IndexOf(file.Name) != -1)
                {
                    file.Delete();
                }
            }

仅对File和Directory而不是FileInfo和DirectoryInfo使用静态方法将执行速度更快。(请参阅C#中File和FileInfo之间的区别是什么?)。答案显示为实用方法。

public static void Empty(string directory)
{
    foreach(string fileToDelete in System.IO.Directory.GetFiles(directory))
    {
        System.IO.File.Delete(fileToDelete);
    }
    foreach(string subDirectoryToDeleteToDelete in System.IO.Directory.GetDirectories(directory))
    {
        System.IO.Directory.Delete(subDirectoryToDeleteToDelete, true);
    }
}
DirectoryInfo Folder = new DirectoryInfo(Server.MapPath(path)); 
if (Folder .Exists)
{
    foreach (FileInfo fl in Folder .GetFiles())
    {
        fl.Delete();
    }

    Folder .Delete();
}
System.IO.DirectoryInfo di = new DirectoryInfo("YourPath");

foreach (FileInfo file in di.GetFiles())
{
    file.Delete(); 
}
foreach (DirectoryInfo dir in di.GetDirectories())
{
    dir.Delete(true); 
}

如果您的目录可能有许多文件,EnumerateFiles()比GetFiles()更有效,因为当您使用EnumerateFile()时,您可以在返回整个集合之前开始枚举它,而不是GetFiles(,在开始枚举之前,您需要在内存中加载整个集合。请参阅此处的引用:

因此,当您使用许多文件和目录时,EnumerateFiles()可以更有效。

这同样适用于EnumerateDirectories()和GetDirectory()。所以代码应该是:

foreach (FileInfo file in di.EnumerateFiles())
{
    file.Delete(); 
}
foreach (DirectoryInfo dir in di.EnumerateDirectories())
{
    dir.Delete(true); 
}

对于这个问题,确实没有理由使用GetFiles()和GetDirectories()。