Introduction: One-way operations in WCF Services.

One-way operations is is all about an operation which have not any returned values. Sometimes, Client does not care about success and failure of the calling of any operations, In this type of cases, WCF offers one-way operations. Once the client issues the call, WCF generates a request message, but no reply message will return to the client.As a result, One-way operations does not return any values.
When the client callls a one-way method, it should not be called for a moment that means one way call do not support asynchronous calls.

Configure one-way Operations:

The OperationContract attribute offers the Boolean IsOneWay property. Here, we use 'b' as IsOneWay property as shown in the code below:

Code:

<AttributeUsage(AttributeTargets.Method)> _
 Public NotInheritable Class OperationContractAttribute
 Inherits Attribute
 Public Property b() As Boolean
 Get
 Return m_b
End Get
 Set(value As Boolean)
m_b = Value
End Set
 End Property
 Private m_b As Boolean

End Class

By default, the value of IsOneWay property is false which means it is a request-reply operations. We have a need to change IsOneWay property to true for making it One nway operation.

<ServiceContract()> _
 Interface IMyService1
 <OperationContract(b:=True)> _
Sub Mymethod()

End Interface

Public Class MyService1
 Implements IMyService1

Public Sub Mymethod()
Return "hello"
 End Sub
End Class

Client Implementation Code:

MyService1 s1 = new MyService1();

s1.Mymethod();