文件流（FileStream），

内存流（MemoryStream），

压缩流（GZipStream），

加密流（CrypToStream），

网络流（NetworkStream）；

1.文件流（读取文件流-输出文件流）FileStream

using(Streamstreamwrite=new FileStream(@"D:\BaiduYunDownload\45.avi",FileMode.OpenOrCreate))
{
using (Stream streamread = new FileStream(@"D:\BaiduYunDownload\xiawu3.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);
}
}
}
}