Per Call Instance
In WCF there are 3 types of instancing we can do
In WCF there are 3 types of instancing we can do
- Per Call
- per Session
- Single
Per Call
When we don configuration in WCF service as per call, every call method new service instances are created
In the below example I have created on service for percall
Below example shows the details.
When we don configuration in WCF service as per call, every call method new service instances are created
In the below example I have created on service for percall
Below example shows the details.
namespace PerCall
{
[ServiceContract(Namespace=" http://sujitbhujbal.blogspot.com")]
//Created PerCall Interface
public interface IPerCall {
[OperationContract]
int IncrementCounter();
}
//PerCall session created
[ServiceBehavior(InstanceContextMode=InstanceContextMode.PerCall)]
public class CounterServicePerCall: IPerCall {
private int m_counter;
int ICounterServicePerCall.IncrementCounter()
{
m_counter++;
MessageBox.Show(String.Format("Incrementing PerCall counter to {0}.\r\nSession Id: {1}", m_counter, OperationContext.Current.SessionId));
return m_counter;
} }
}
In the above example i created one service that creates PerCall instance and on the every instacne Counter is incremented
Below screen shot shows the different settings and Per call instances
When we click on PerCall button below screenshots shows the details what happen in PerCall
When again we press perCall session counter remains the same
Above screenshots and example shows that when we use per call instance in WCF every time call is created and counter remains same.
When should we use per call mode?
Per call
When you want a stateless services
When your WCF functions are called in a per call
References
MSDN link for WCF instances http://msdn.microsoft.com/en-us/library/ms733040.aspx
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