简单的C#Socket编程

server,服务器代码。
使用socket套接字连接。

using system;
using system.net;
using system.net.sockets;
using system.io ;

public class echoserver
{
//entry point of main method.
public static void main()
{
//tcplistener is listening on the given port
int32 port = 1234;

//ipaddress is connetct ip address
//ipaddress addr = ipaddress.parse("127.0.0.1");
ipaddress ipaddress = dns.resolve("localhost").addresslist[0];

tcplistener tcplistener = new tcplistener(ipaddress,port);
tcplistener.start();
console.writeline("server started") ;
//accepts a new connection
socket socketforclient = tcplistener.acceptsocket();
//streamwriter and streamreader classes for reading and writing the data to and from.
//the server reads the meassage sent by the client ,converts it to upper case and sends it back to the client.
//lastly close all the streams.
try
{
if (socketforclient.connected)
{
while(true)
{
console.writeline("client connected");
networkstream networkstream = new networkstream(socketforclient);
streamwriter streamwriter = new streamwriter(networkstream);
streamreader streamreader = new streamreader(networkstream);
string line = streamreader.readline();
console.writeline("read:" +line);
line=line.toupper()+ "!";
streamwriter.writeline(line);
console.writeline("wrote:"+line);
streamwriter.flush() ;
}
}
socketforclient.close();
console.writeline("exiting");
}
catch(exception e)
{
console.writeline(e.tostring()) ;
}
}
}

client,客户端程序，在文本框中输入字符，将在列表框显示。
using system;
using system.text;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.net;
using system.net.sockets;
using system.io;

namespace socketsample
{
public class sample : system.windows.forms.form
{
private system.windows.forms.button bts;
private system.windows.forms.textbox t1;
private networkstream networkstream ;
private streamreader streamreader ;
private streamwriter streamwriter ;
arraylist sb;
tcpclient myclient;
bool flag=false;
private system.windows.forms.listbox t2;

private system.componentmodel.container components = null;

public sample()
{
sb = new arraylist();
initializecomponent();
if(!flag)
connect();

//get a network stream from the server
networkstream = myclient.getstream();
streamreader = new streamreader(networkstream);
streamwriter = new streamwriter(networkstream);
showmessage();
}

protected override void dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.dispose();
}
}
base.dispose( disposing );
}

windows 窗体设计器生成的代码#region windows 窗体设计器生成的代码
/**////

}
#endregion

public static void main()
{
sample df=new sample();
df.formborderstyle=formborderstyle.fixed3d;
application.run(df);
}

protected void connect()
{
//connect to the "localhost" at the give port
//if you have some other server name then you can use that instead of "localhost"

try
{
sb.add("conneting to server");
myclient = new tcpclient("localhost", 1234);
sb.add("conneted,please enter something in the textbox");
}
catch
{
sb.add(string.format("failed to connect to server at {0}:1234", "localhost"));
}
flag = true;
}

protected void showmessage()
{
for(int i=0;i {
t2.items.add((object)sb[i].tostring());
}
sb.clear();
}

private void t1_textchanged(object sender, system.eventargs e)
{
if(t1.text == "" )
bts.enabled = false;
else
bts.enabled=true;
}

private void bts_click(object sender, system.eventargs e)
{
if(t1.text=="")
{
sb.add( "please enter something in the textbox.");
t1.focus();
return ;
}
string s;
try
{
streamwriter.writeline(t1.text);
console.writeline("sending message");
streamwriter.flush();
s= streamreader.readline();
console.writeline("reading message") ;
console.writeline(s) ;
sb.add(s);
t1.text = "";
t1.focus();
showmessage();
}
catch
{
messagebox.show("error.");
}
}
}
}