C#学习之Stream

上节课老师主要讲了stream及其一些运用和实例，下面我们就来讨论讨论Stream。

我们知道，C#中常用的stream有文件流（FileSteam），内存流（MemoryStream），压缩流（GZipStream），加密流（CrypToStream），网络流（NetworkStream）。

下面是一些代码的展示：

1.文件流（读取文件流-输出文件流）FileStream  

using(Streamstreamwrite=new FileStream(@"D:BaiduYunDownload45.avi",FileMode.OpenOrCreate))

{

using (Stream streamread = new FileStream(@"D:BaiduYunDownloadxiawu3.avi", FileMode.Open))

{ 

byte[] ss=new byte[1024*1024*4];

int len;

while ((len = streamread.Read(ss, 0, ss.Length)) > 0)

{

streamwrite.Write(ss, 0, len);

Thread.Sleep(1000);

}

}

}

      2.      内存流（MemoryStream）       

string strtxt="dasdfdsfsd";

byte[] bytetxt = Encoding.UTF8.GetBytes(strtxt);

Stream memstream = new MemoryStream();

memstream.Write(bytetxt, 0, bytetxt.Length);

3.压缩流（GZipStream），       

压缩：  

string s = "dfdfdf";

using (FileStream filestream = File.OpenWrite(@"c:2.txt"))

{

using (GZipStream zipstream = new GZipStream(filestream, CompressionMode.Compress))

{

byte[] bytes = Encoding.UTF8.GetBytes(s);

zipstream.Write(bytes, 0, bytes.Length);

}

}

解压：

using (FileStream filestream = File.OpenRead(@"c:2.txt"))

{

using (GZipStream zipstream = new GZipStream(filestream, CompressionMode.Decompress))

{

using (FileStream filestreamwrite = new FileStream(@"c:3.txt", FileMode.OpenOrCreate))

{

byte[] bytes = new byte[1024 * 1024 * 4];

int length;

while ((length = zipstream.Read(bytes, 0, bytes.Length)) > 0)

{

filestreamwrite.Write(bytes, 0, length);

}

}

}

}