C# 设置文件权限

//设置权限

public void addpathPower(string pathname, string username, string power)
{
    DirectoryInfo dirinfo = new DirectoryInfo(pathname);

    if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)
    {
    dirinfo.Attributes = FileAttributes.Normal;
    }

    //取得访问控制列表

    DirectorySecurity dirsecurity = dirinfo.GetAccessControl();

    switch (power)
    {
        case "FullControl":
            dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit, PropagationFlags.InheritOnly, AccessControlType.Allow));
            dirinfo.SetAccessControl(dirsecurity);
        break;
        case "ReadOnly":
            dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Read, AccessControlType.Allow));
            dirinfo.SetAccessControl(dirsecurity);
        break;
        case "Write":
            dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Write, AccessControlType.Allow));
            dirinfo.SetAccessControl(dirsecurity);
        break;
        case "Modify":
            dirsecurity.AddAccessRule(new FileSystemAccessRule(username, FileSystemRights.Modify, AccessControlType.Allow));
            dirinfo.SetAccessControl(dirsecurity);
        break;
    }
}