A simple test of WF Messaging Activity
firstly create a WF service which act like normal WCF service to be our service for testing.
1. create a wf console project.
2. add a class which is responsible for building a workflow . here is the code.
{
public WorkflowService GetInstance()
{
WorkflowService service;
Variable< int> x = new Variable< int> { Name = " x " };
Variable< int> y = new Variable< int> { Name = " y " };
Variable< int> addResult =
new Variable< int> { Name = " addResult " };
Receive receive = new Receive
{
ServiceContractName = " ICalculateService ", // Wcf合约名
OperationName = " GetData ", // 合约中的方法
CanCreateInstance = true, // 必需的，收到消息后创建一个WF实例
Content = new ReceiveParametersContent
{
Parameters ={
{ " xIn ", new OutArgument< int>(x)}, // 接收消息中的"xIn"和"yIn"关键字的值，并赋值给x和y变量
{ " yIn ", new OutArgument< int>(y)}
}
}
};
Sequence workflow = new Sequence()
{
Variables = { x, y, addResult },
Activities = {
new WriteLine{Text= " WF service is starting... "},
receive,
new WriteLine{Text= " receive request with two numbers "},
new WriteLine{
Text= new InArgument< string>(aec=> " x= "+x.Get(aec).ToString()+ " y= "+y.Get(aec))
},
new Assign< int>{
Value= new InArgument< int>(aec=>x.Get(aec)+y.Get(aec)),
To= new OutArgument< int>(addResult)
},
new WriteLine{
Text= new InArgument< string>(aec=> " addResult= "+addResult.Get(aec).ToString())
},
new WriteLine{Text= " Then send the result back to client "},
new SendReply{
Request=receive,
Content= new SendParametersContent{
Parameters=
{
{ " addResult ", new InArgument< int>(addResult)} // 将addResult变量的值赋给返回消息中的元素“addResult”
// 个人认为这里到底是InArgument还是OutArgument。要看这里是输入还是输出。如果是输出到这个参数。那么就是Out,反之就是In.
},
},
},
new WriteLine{Text= " sent result back done "}
},
};
service = new WorkflowService
{
Name = " AddService ",
Body = workflow
};
return service;
}
}
3. in the main method code .
{
static void Main( string[] args)
{
ReceiveAndReplyWorkflow rrw = new ReceiveAndReplyWorkflow();
WorkflowService wfService = rrw.GetInstance();
Uri address =
new Uri( " http://localhost:8000/WFServices ");
WorkflowServiceHost host =
new WorkflowServiceHost(wfService, address);
try
{
Console.WriteLine( " Opening Service... ");
host.Open();
Console.WriteLine
( " WF service is listening on " + address.ToString());
Console.ReadLine();
}
catch (Exception e)
{
Console.WriteLine
( " some thing bad happened " + e.StackTrace);
}
finally
{
host.Close();
}
}
}
4. and the configuration in app.config.
< configuration >
< system.serviceModel >
< behaviors >
< serviceBehaviors >
< behavior name ="" >
< serviceMetadata httpGetEnabled ="True" />
</ behavior >
</ serviceBehaviors >
</ behaviors >
</ system.serviceModel >
</configuration>
5. until now . the server endpoint is ready . ctrl +f5 make this service work.
6. you can use the wcf test client tool to verify the service working.
as we can see. this wcf has two input parameter . one return result. we can check it out in the "xml" tab.
above figure show the send and response message which contact with the service we build .
next . we will build a client which in charge of calling the service just like the work that wcf test client done.
1. we create a wf console project being the client.
2. add a class which is responsible for building a workflow . here is the code.
{
public Activity GetInstance()
{
Variable< int> x = new Variable< int>( " x ", 20);
Variable< int> y = new Variable< int>( " y ", 10);
Variable< int> addResult = new Variable< int>( " addResult ", 0);
var endpoint = new System.ServiceModel.Endpoint
{
AddressUri = new Uri( " http://localhost:8000/WFServices "), // 必须指定，要请求的WCF endpoint
Binding = new BasicHttpBinding(),
};
Send addRequest = new Send
{
ServiceContractName = " ICalculateService ",
Endpoint = endpoint,
OperationName = " GetData ",
Content = new SendParametersContent
{
Parameters = {
{ " xIn ", new InArgument< int>(x)},
{ " yIn ", new InArgument< int>(y)}
}
},
};
var workflow = new CorrelationScope
{
Body = new Sequence
{
Variables = { x, y, addResult },
Activities ={
new WriteLine{Text= " Send x:20 and y:10 to WF service "},
addRequest,
new ReceiveReply{
Request=addRequest, // 必须指定，在sendandreceivereplay activity 中会自动指定 如分别建立，send activity 和reveive activity时则要手动指定那个request.
Content= new ReceiveParametersContent{
Parameters={
{ " addResult ", new OutArgument< int>(addResult)} // 第一个参数代表消息中的一个关键字。第二参数表示将前一个关键字中的值赋值给后一个变量，并生成一个出参。
}
},
},
new WriteLine{
Text= new InArgument< string>(aec=>( " The result is: "+addResult.Get(aec).ToString()))
},
new Delay
{
Duration= new TimeSpan( 0, 0, 5)
}
}
}
};
return workflow;
}
}
3. the client main method code just is simply like this.
{
static void Main( string[] args)
{
SendAndReceiveWorkflow srw = new SendAndReceiveWorkflow();
WorkflowInvoker.Invoke(srw.GetInstance());
}
}
well . this is a beginning guild for building and consuming the WF service . in the real business .i believe it is much more complicated than this.
any comment are welcome . i will be appreciate for your attention. thanks
you can down load the project from here . testSendReceive.rar