c#检测网络连接（主要是局域网）

c#检测网络连接问题我没有看到好的方法，都是通过与外网（或者局域网服务器）传递信息检测的。

我看些下下来了

代码：

   private void button1_Click(object sender, EventArgs e)
        {
            string ip;
            ip = "10.1.148.1";
           // string ip = "192.192.132.229";

          //  string strRst = CmdPing(ip);

         //   MessageBox.Show(strRst);
              string   str   =   CmdPingh(ip);  
             MessageBox.Show(str);  

        }
        private static string CmdPing(string strIp)//方法1

{

Process p = new Process();

p.StartInfo.FileName = "cmd.exe";

p.StartInfo.UseShellExecute = false;

p.StartInfo.RedirectStandardInput = true;

p.StartInfo.RedirectStandardOutput = true;

p.StartInfo.RedirectStandardError = true;

p.StartInfo.CreateNoWindow = true;

string pingrst;

p.Start();

p.StandardInput.WriteLine("ping -n 1 "+strIp);

p.StandardInput.WriteLine("exit");

string strRst = p.StandardOutput.ReadToEnd();

if(strRst.IndexOf("(0% loss)")!=-1)

pingrst = "连接";

else if( strRst.IndexOf("Destination host unreachable.")!=-1)

pingrst = "无法到达目的主机";

else if(strRst.IndexOf("Request timed out.")!=-1)

pingrst = "超时";

else if(strRst.IndexOf("Unknown host")!=-1)

pingrst = "无法解析主机";

else

pingrst = strRst;

p.Close();

return pingrst;

}
 public   static   string   CmdPingh(string   _strHost)   //与上面的方法一样，不同写法而已
  {  
  string   m_strHost   =   _strHost;  
                   
  Process   process   =   new   Process();  
  process.StartInfo.FileName   =   "cmd.exe";  
  process.StartInfo.UseShellExecute   =   false;  
  process.StartInfo.RedirectStandardInput   =   true;  
  process.StartInfo.RedirectStandardOutput   =   true;  
  process.StartInfo.RedirectStandardError   =   true;                          
  process.StartInfo.CreateNoWindow   =   true;  
  string   pingrst   =   string.Empty;  
  process.StartInfo.Arguments   =   "ping   "   +   m_strHost   +   "   -n   1";  
  process.Start();  
  process.StandardInput.AutoFlush   =   true;  
  string   temp   =   "ping   "   +   m_strHost   +   "   -n   1"   ;                                          
  process.StandardInput.WriteLine(temp);                                  
  process.StandardInput.WriteLine("exit");                          
  string   strRst   =   process.StandardOutput.ReadToEnd();                                                                  
  if(strRst.IndexOf("(0%   loss)")!=-1)  
  pingrst   =   "连接";  
  else   if(   strRst.IndexOf("Destination   host   unreachable.")!=-1)  
  pingrst   =   "无法到达目的主机";  
  else   if(strRst.IndexOf("Request   timed   out.")!=-1)  
  pingrst   =   "超时";  
  else   if(strRst.IndexOf("Unknown   host")!=-1)  
  pingrst   =   "无法解析主机";  
  else  
  pingrst   =   strRst;  
  process.Close();  
  return   pingrst   ;  
  }

 private void button2_Click(object sender, EventArgs e)
 {
     jcip();
 }  

private void jcip()//方法2
{
    Ping pingSender = new Ping ();
            PingOptions options = new PingOptions ();

            // Use the default Ttl value which is 128,
            // but change the fragmentation behavior.
            options.DontFragment = true;

            // Create a buffer of 32 bytes of data to be transmitted.
            string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
            byte[] buffer = Encoding.ASCII.GetBytes (data);
            int timeout = 120;
            PingReply reply = pingSender.Send ("10.1.148.1", timeout, buffer, options);
            if (reply.Status == IPStatus.Success)
            {
                MessageBox.Show("连接正常");
            }
            else
            {
                MessageBox.Show("网络没有连接");
            }
  

}

}