C# 文件流FileStream 實現多媒體文件復制 StreamReader StreamWriter 讀取寫入文本

#region 實現多媒體文件的復制
string source = @"F:\123\source.avi";//源文件路徑
string target = @"F:\123\test.avi";//復制后的文件路徑

CopyFile(source, target);
Console.WriteLine("復制成功");
#endregion
Console.ReadKey();


public static void CopyFile(string source, string target)
{
            //創建一個負責讀取的流
            using (FileStream fsRead = new FileStream(source, FileMode.Open, FileAccess.Read))
            {
                //創建一個負責寫入的流
                using (FileStream fsWrite = new FileStream(target, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    byte[] buffer = new byte[1024 * 1024 * 5];

                    //因為文件可能比較大所以在讀取的時候應該用循壞去讀取
                    while (true)
                    {
                        //返回本次實際讀取到的字節數
                        int r = fsRead.Read(buffer, 0, buffer.Length);

                        if (r == 0)
                        {
                            break;
                        }
                        fsWrite.Write(buffer, 0, r);//寫入
                    }

                }
}

//使用StreamReader讀取文本文件
using (StreamReader sr = new StreamReader(@"F:\123.txt", Encoding.Default))
{
     while (!sr.EndOfStream)
     {
                    Console.WriteLine(sr.ReadLine());
     }
}

//使用StreamWrite寫入文本文件
using (StreamWriter sw = new StreamWriter(@"F:\123.txt"))
{
      sw.Write("寫入內容");
}