C# UDP廣播訊息

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首先是發送端：

/// <summary>/// 發送UDP訊息/// </summary>/// <param name="msg">訊息內容</param>void Send(string msg){    UdpClient udpClient = new UdpClient();    IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Broadcast, 10249);    byte[] buffer = Encoding.UTF8.GetBytes(msg);    udpClient.Send(buffer, buffer.Length, ipEndPoint);}

 

然後是接收端：

static void Main(){    UdpClient udpServer = new UdpClient(10249);    IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, 10249);    udpServer.BeginReceive(Received, udpServer);}

/// <summary>
/// 非同步接收UDP資料
/// </summary>
/// <param name="iar"></param>
void Received(IAsyncResult iar)
{
　　udpServer = iar.AsyncState as UdpClient;
　　byte[] buffer = udpServer.EndReceive(iar, ref ipEndPoint);

　　//將擷取的byte[]資料轉換成字串
　　string m = Encoding.UTF8.GetString(buffer).Trim();

　　Console.WriteLine("Receive:{0}",m);

　　//繼續非同步接收資料
　　udpServer.BeginReceive(Received, udpServer);
}

接收端採用了非同步執行的方式，當然也可以用Thread來做！

C# UDP廣播訊息