C#批量删除文件与文件夹

删除文件夹或文件是一个很简单的操作，调用File或Directory的Delete方法即可。但如果文件较多，非常细碎的话，这样的方法就无法容忍了。

在操作系统中一次性删除大量文件，也应该有这样的体会。

所以，得采取其他方法，来提高删除的速度。测试可行的方案是使用Windows 函数，而不是 .NET 函数。操作类如下：

public static class FileOperation
{
    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool DeleteFile(string lpFileName);
 
    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool CopyFile(string lpExistingFileName, string lpNewFileName, bool bFailIfExists);
 
    public static void Copy(this string sourceFileName, string targetFileName, bool bFailIfExists = true)
    {
        if (File.Exists(sourceFileName))
        {
            CopyFile(sourceFileName, targetFileName, bFailIfExists);
        }
    }
 
    public static void Delete(this string directory)
    {
        if (Directory.Exists(directory))
        {
            var files = Directory.EnumerateFiles(directory, "*", SearchOption.AllDirectories);
            foreach (string file in files)
            {
                DeleteFile(file);
            }
 
            var directories = Directory.EnumerateDirectories(directory, "*", SearchOption.AllDirectories);
            foreach (string dir in directories)
            {
                Directory.Delete(dir, true);
            }
        }
    }
}