首先，我們創建一個繼承命名空間System.Net.Sockets的TcpClient類的類。TcpClient類提供簡單的方法用于連接，發送，接收網絡的數據流。GetStream方法用于創建一個網絡流（NetworkStream）。讀和寫網絡流（NetworkStream）的方法用于發送數據給遠程主機和從遠程主機接收網絡流。
接下來，我們創建發送郵件出去的類，這個類有幾個屬性去設置關于被發送的郵件的一些信息。| public class ClientConnection : TcpClient { private NetworkStream _NetworkStream = null; private StreamReader _StreamReader = null; private StreamWriter _StreamWriter = null; public void Initialise() { _NetworkStream = this.GetStream(); _StreamReader = new StreamReader(_NetworkStream, System.Text.Encoding.Default, false, this.ReceiveBufferSize); _StreamWriter = new StreamWriter(_NetworkStream, System.Text.Encoding.Default, this.SendBufferSize); } public void Send(string s) { _StreamWriter.WriteLine(s); _StreamWriter.Flush(); } public string Read() { return _StreamReader.ReadLine(); } } |
| public string MailServer = "127.0.0.1" ; public string From = "" ; public string To = "" ; public string Body = "" ; public string Subject = "" ; |
和一個發送郵件的方法。這個方法將會用服務器名和它的端口去創建一個連接。指令可以被發送到遠程主機。
| public void Send() { tcp = new ClientConnection(); tcp.Connect(MailServer,25); tcp.Initialise(); SendCommandToServer("HELO " + System.Net.Dns.GetHostName()); SendCommandToServer("MAIL FROM: " + From + "\r\n"); SendCommandToServer("RCPT TO: " + To + "\r\n"); string StrHeaders = ""; StrHeaders += "From: " + From + "\r\n"; StrHeaders += "To: " + To + "\r\n"; StrHeaders += "Subject: " + Subject + "\r\n"; StrHeaders += "Content-type: text/plain; charset=\"ISO-8859-1\"" + "\r\n"; SendCommandToServer("DATA\r\n" + StrHeaders); SendCommandToServer(Body + "\r\n.\r\n"); SendCommandToServer("QUIT\r\n"); } |
還有一個私有的送一個指令到本地服務器的方法。
| private void SendCommandToServer(string cmd) { tcp.Send(cmd); Response=tcp.Read(); System.Web.HttpContext.Current.Trace.Warn("Response",Response); } |
現在，這個類基本完成了。開發者還可以建立錯誤回執和釋放資源（用TcpClient類中的Close()方法）。同樣，這幾個屬性可以被擴展到在郵件中包含更多的信息。
最后，我們可以在aspx文件中寫一些發送郵件的代碼。在這個例子中，"localhost"是郵件服務器。你可以根據情況改變這個，或者可以看我的關于如何設置你的發送郵件的本地服務器的文章。
| ＜%@ Import Namespace="MyComponents" %＞ ＜script runat="server"＞ protected void Page_Load(Object Src, EventArgs E) { if (IsPostBack) { Mail Mailer=new Mail(); Mailer.From=From.Text; Mailer.To=To.Text; Mailer.Subject=Subject.Text; Mailer.Body=Body.Text; Mailer.MailServer="localhost"; Mailer.Send(); } } ＜/script＞ |
| using System.IO; using System.Net.Sockets; namespace MyComponents { public class ClientConnection : TcpClient { private NetworkStream _NetworkStream = null; private StreamReader _StreamReader = null; private StreamWriter _StreamWriter = null; public void Initialise() { _NetworkStream = this.GetStream(); _StreamReader = new StreamReader(_NetworkStream, System.Text.Encoding.Default, false, this.ReceiveBufferSize); _StreamWriter = new StreamWriter(_NetworkStream, System.Text.Encoding.Default, this.SendBufferSize); } public void Send(string s) { _StreamWriter.WriteLine(s); _StreamWriter.Flush(); } public string Read() { return _StreamReader.ReadLine(); } } public class Mail { public string MailServer = "127.0.0.1" ; public string From = "" ; public string To = "" ; public string Body = "" ; public string Subject = "" ; private ClientConnection tcp=null; private string Response=""; public void Send() { tcp = new ClientConnection(); tcp.Connect(MailServer,25); tcp.Initialise(); SendCommandToServer("HELO " + System.Net.Dns.GetHostName()); SendCommandToServer("MAIL FROM: " + From + "\r\n"); SendCommandToServer("RCPT TO: " + To + "\r\n"); string StrHeaders = ""; StrHeaders += "From: " + From + "\r\n"; StrHeaders += "To: " + To + "\r\n"; StrHeaders += "Subject: " + Subject + "\r\n"; StrHeaders += "Content-type: text/plain; charset=\"ISO-8859-1\"" + "\r\n"; SendCommandToServer("DATA\r\n" + StrHeaders); SendCommandToServer(Body + "\r\n.\r\n"); SendCommandToServer("QUIT\r\n"); } private void SendCommandToServer(string cmd) { tcp.Send(cmd); Response=tcp.Read(); System.Web.HttpContext.Current.Trace.Warn("Response",Response); } } } |
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