Zulfiqar's weblog

Architecture, security & random .Net

Setting UserName ClientCredentials in WF SendActivity

Posted by zamd on June 2, 2008

I was recently asked if there is a way to set custom UserName credentials in a SendActivity. I did some investigation and couldn’t find any OOB way do achieve this. So the next step was to look into WCF’s awesome extensibility mechanism **Bahaviors**. Turns out you can achieve this functionality quite easily by writing a custom endpoint behavior.

Step 1 would be to create a custom endpoint behavior:

public class UserNameBehavior : IEndpointBehavior


    #region IEndpointBehavior Members

    public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)


    public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)


        var cc = endpoint.Behaviors.Find<ClientCredentials>();

        cc.UserName.UserName = “zahmed”;

        cc.UserName.Password = “password”;


    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)


    public void Validate(ServiceEndpoint endpoint)




In the ApplyClientBehavior method, find the appropriate behavior object and override its properties to your desired values. Now you have to specify this behavior in the endpoint configuration of the SendActivity.

To use your custom behavior from config you have to create a BehaviorElementExtension(Step 2)

    public class UserNameBehaviorElement : BehaviorExtensionElement


        protected override object CreateBehavior()


            return new UserNameBehavior();


        public override Type BehaviorType


            get { return typeof(UserNameBehavior); }



Step 3 would be to register your behavior as an extension in the config file:



    <add name=userName type=WorkflowConsoleApplication1.UserNameBehaviorElement, WorkflowConsoleApplication1, Version=, Culture=neutral, PublicKeyToken=null/>



At this point your custom behavior is ready to be used in the endpoint configuration used by the SendActivity. Here is the complete config file.





        <binding name=BasicHttpBinding ICalcultor>

          <security mode=Transport>

            <transport clientCredentialType=Basic />






      <endpoint address=https://localhost:7000/Calc binding=basicHttpBinding

          bindingConfiguration=BasicHttpBinding ICalcultor contract=ServiceReference1.ICalcultor

          name=BasicHttpBinding ICalcultor behaviorConfiguration=userNameBehavior />




        <behavior name=userNameBehavior>







        <add name=userName type=WorkflowConsoleApplication1.UserNameBehaviorElement, WorkflowConsoleApplication1, Version=, Culture=neutral, PublicKeyToken=null/>





2 Responses to “Setting UserName ClientCredentials in WF SendActivity”

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