ProtocolType Enumeration
Specifies the protocols that the Socket class supports.
Assembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| Ggp | Gateway To Gateway Protocol. | |
| Icmp | Internet Control Message Protocol. | |
| IcmpV6 | Internet Control Message Protocol for IPv6. | |
| Idp | Internet Datagram Protocol. | |
| Igmp | Internet Group Management Protocol. | |
| IP | Internet Protocol. | |
| IPSecAuthenticationHeader | IPv6 Authentication header. For details, see RFC 2292 section 2.2.1, available at http://www.ietf.org. | |
| IPSecEncapsulatingSecurityPayload | IPv6 Encapsulating Security Payload header. | |
| IPv4 | Internet Protocol version 4. | |
| IPv6 | Internet Protocol version 6 (IPv6). | |
| IPv6DestinationOptions | IPv6 Destination Options header. | |
| IPv6FragmentHeader | IPv6 Fragment header. | |
| IPv6HopByHopOptions | IPv6 Hop by Hop Options header. | |
| IPv6NoNextHeader | IPv6 No next header. | |
| IPv6RoutingHeader | IPv6 Routing header. | |
| Ipx | Internet Packet Exchange Protocol. | |
| ND | Net Disk Protocol (unofficial). | |
| Pup | PARC Universal Packet Protocol. | |
| Raw | Raw IP packet protocol. | |
| Spx | Sequenced Packet Exchange protocol. | |
| SpxII | Sequenced Packet Exchange version 2 protocol. | |
| Tcp | Transmission Control Protocol. | |
| Udp | User Datagram Protocol. | |
| Unknown | Unknown protocol. | |
| Unspecified | Unspecified protocol. |
The following example demonstrates how to use ProtocolType to instantiate a Socket.
Imports System Imports System.Text Imports System.IO Imports System.Net Imports System.Net.Sockets _ Public Class Sample Public Shared Function DoSocketGet(server As String) As String 'Set up variables and String to write to the server. Dim ASCII As Encoding = Encoding.ASCII Dim [Get] As String = "GET / HTTP/1.1" + ControlChars.Lf + ControlChars.NewLine + "Host: " + server + ControlChars.Lf + ControlChars.NewLine + "Connection: Close" + ControlChars.Lf + ControlChars.NewLine + ControlChars.Lf + ControlChars.NewLine Dim ByteGet As [Byte]() = ASCII.GetBytes([Get]) Dim RecvBytes(256) As [Byte] Dim strRetPage As [String] = Nothing ' IPAddress and IPEndPoint represent the endpoint that will ' receive the request. ' Get first IPAddress in list return by DNS. Try ' Define those variables to be evaluated in the next for loop and ' then used to connect to the server. These variables are defined ' outside the for loop to make them accessible there after. Dim s As Socket = Nothing Dim hostEndPoint As IPEndPoint Dim hostAddress As IPAddress = Nothing Dim conPort As Integer = 80 ' Get DNS host information. Dim hostInfo As IPHostEntry = Dns.Resolve(server) ' Get the DNS IP addresses associated with the host. Dim IPaddresses As IPAddress() = hostInfo.AddressList ' Evaluate the socket and receiving host IPAddress and IPEndPoint. Dim index As Integer = 0 For index = 0 To IPaddresses.Length - 1 hostAddress = IPaddresses(index) hostEndPoint = New IPEndPoint(hostAddress, conPort) ' Creates the Socket to send data over a TCP connection. s = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) ' Connect to the host using its IPEndPoint. s.Connect(hostEndPoint) If Not s.Connected Then ' Connection failed, try next IPaddress. strRetPage = "Unable to connect to host" s = Nothing GoTo ContinueFor1 End If ' Sent the GET request to the host. s.Send(ByteGet, ByteGet.Length, 0) ContinueFor1: Next index ' End of the for loop. ' Receive the host home page content and loop until all the data is received. 'Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0) Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0) strRetPage = "Default HTML page on " + server + ":\r\n" strRetPage = "Default HTML page on " + server + ":" + ControlChars.Lf + ControlChars.NewLine Dim i As Integer While bytes > 0 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0) strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes) End While ' End of the try block. Catch e As SocketException Console.WriteLine("SocketException caught!!!") Console.WriteLine(("Source : " + e.Source)) Console.WriteLine(("Message : " + e.Message)) Catch e As ArgumentNullException Console.WriteLine("ArgumentNullException caught!!!") Console.WriteLine(("Source : " + e.Source)) Console.WriteLine(("Message : " + e.Message)) Catch e As NullReferenceException Console.WriteLine("NullReferenceException caught!!!") Console.WriteLine(("Source : " + e.Source)) Console.WriteLine(("Message : " + e.Message)) Catch e As Exception Console.WriteLine("Exception caught!!!") Console.WriteLine(("Source : " + e.Source)) Console.WriteLine(("Message : " + e.Message)) End Try Return strRetPage End Function 'DoSocketGet Public Shared Sub Main() Console.WriteLine(DoSocketGet("localhost")) End Sub 'Main End Class 'Sample
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.1