DirectoryInfo Folder = new DirectoryInfo(Server.MapPath(path)); 
if (Folder .Exists)
{
    foreach (FileInfo fl in Folder .GetFiles())
    {
        fl.Delete();
    }

    Folder .Delete();
}

最简单的方法：

Directory.Delete(path,true);  
Directory.CreateDirectory(path);

请注意，这可能会删除文件夹上的某些权限。

 new System.IO.DirectoryInfo(@"C:\Temp").Delete(true);

 //Or

 System.IO.Directory.Delete(@"C:\Temp", true);

使用DirectoryInfo的GetDirectories方法。

foreach (DirectoryInfo subDir in new DirectoryInfo(targetDir).GetDirectories())
                    subDir.Delete(true);

DirectoryInfo.GetFileSystemInfos同时返回文件和目录：-

new DirectoryInfo(targetDir).GetFileSystemInfos().ToList().ForEach(x => x.Delete());

或者如果要递归删除：-

        new DirectoryInfo(targetDir).GetFileSystemInfos().ToList().ForEach(x =>
        {
            if (x is DirectoryInfo di)
                di.Delete(true);
            else
                x.Delete();
        });

private void ClearFolder(string FolderName)
{
    DirectoryInfo dir = new DirectoryInfo(FolderName);

    foreach (FileInfo fi in dir.GetFiles())
    {
        fi.IsReadOnly = false;
        fi.Delete();
    }

    foreach (DirectoryInfo di in dir.GetDirectories())
    {
        ClearFolder(di.FullName);
        di.Delete();
    }
}