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);                    }                }            }        }