FileStream文件流

使用文件流拷贝一个较大的多媒体文件：

public static void CopyFile(string soucre, string target)
        {
            using (FileStream fsRead = new FileStream(soucre, FileMode.Open, FileAccess.Read))
            {
                using (FileStream fsWrite = new FileStream(target, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    byte[] buffer = new byte[1024*1024];
                    while (true)
                    {
                        int r = fsRead.Read(buffer, 0, buffer.Length);
                        if (r == 0)
                        {
                            break;
                        }
                        fsWrite.Write(buffer, 0, r);
                    }
                }
            }
        }