The message exchange patterns in WCF is divided into request/reply, one-way, duplex, or callback );
This chapter mainly introduces request/reply operations. Request/response operations are the default actions of all service operations. By viewing the WSDL description, we can see <WSDL: description of input> and <WSDL: output> messages. The message can contain request parameters, returned data, <body> elements, or returned soap errors.
In a request/response operation, the client sends a request in the form of a message, which blocks the client until it receives the Response Message. The default response timeout value is 1 minute. If the service still does not respond after this time, the client will get a timeoutexception exception. The request/response is similar to the classic Client/Server programming model. The returned response message includes the returned result, or it converts the returned value to the return value of a common method. In addition, if there is a communication exception or a server exception, the proxy throws an exception on the client. Except for binding netpeertcpbinding and netmsmqbinding, all bindings support request/response operations.
The request/response operation mode is as follows:
Next we will introduce the request/response operations through a demo:
MainCodeAs follows:
Interface code:
[Servicecontract (namespace = " Http://schemas.xinhaijulan.com/demos/RequestReply " )]
Public Interface Ihellowcf
{
[Operationcontract (name = " Getmessagecontract " , Action = " URN: acioninput " , Replyaction = " URN: actionoutput " )]
String Getmessage ( String MSG );
}
Implementation Code:
Public Class Hellowcf: ihellowcf
{
Public String Getmessage ( String MSG)
{
Return " Message from client is: " + MSG;
}
}
Server code:
Static Void Main ( String [] ARGs)
{
Using (Servicehost host = New Servicehost ( Typeof (Servicelibrary. hellowcf )))
{
Host. addserviceendpoint ( Typeof (Servicelibrary. ihellowcf ), New Nettcpbinding (), " Net. TCP: // localhost: 9000/hellowcf " );
Host. open ();
Console. writeline ( " Please input exit to close host. " );
String Key = Console. Readline ();
While (Key. tolower () ! = " Exit " )
{
Console. writeline ( " Please input exit to close host. " );
Key = Console. Readline ();
}
}
}
Client code:
Static Void Main ( String [] ARGs)
{
Channelfactory < Servicelibrary. ihellowcf > Channelfactory = New Channelfactory < Servicelibrary. ihellowcf > ( New Nettcpbinding ());
Servicelibrary. ihellowcf Client = Channelfactory. createchannel ( New Endpointaddress ( " Net. TCP: // localhost: 9000/hellowcf " ));
Using (Client As Idisposable)
{
Console. writeline ( " ------------ Begin ------------- " );
Console. writeline (client. getmessage ( " Hello WCF! " ));
Console. writeline ( " ------------ End --------------- " );
}
Console. Readline ();
}
Run the code and output it as follows:
------------Begin-------------
Message from clientIs: Hello WCF!
------------End---------------
Now, the message exchange mode (MEP)-Request/response operation has been introduced.
Click to download the demo.
Author: Xinhai julan
Source: http://xinhaijulan.cnblogs.com
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