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The RolesEdit and ProjectList forms implement methods to retrieve the central business object from Session, or to retrieve it from the database as necessary. This not only implements a type of cache to reduce load on the database, but it provides support for the browser s Back button as well. The same thing is done in ProjectEdit: private Project GetProject() { object businessObject = Session["currentObject"]; if (businessObject == null || !(businessObject is Project)) { try { string idString = Request.QueryString["id"]; if (!string.IsNullOrEmpty(idString)) { Guid id = new Guid(idString); businessObject = Project.GetProject(id); } else businessObject = Project.NewProject(); Session["currentObject"] = businessObject; } catch (System.Security.SecurityException) { Response.Redirect("ProjectList.aspx"); } } return (Project)businessObject; } As before, if there s no object in Session, or if the object isn t a Project, then a Project is retrieved from the database. But the code here is a bit more complex than that in the other forms. Notice that the Request.QueryString property is used to get the id value (if any) passed in on the page s URL. If an id value was passed into the page, that value is used to retrieve an existing Project: Guid id = new Guid(idString); businessObject = Project.GetProject(id); Otherwise, a new Project is created for the page: businessObject = Project.NewProject(); Either way, the resulting object is placed into Session and is also returned as a result from the method. It is possible for a user to navigate directly to ProjectEdit.aspx, providing no id value on the URL. In such a case, the user might not be authorized to add a Project, and so a SecurityException would result. In that case, the user is simply redirected to the ProjectList page, where they can safely view the list of projects.

The third way is for the publisher to simply inform prospective clients of its policy requirements without sending a policy framework file The disadvantage of this approach is that it puts the burden on the client developer to manually verify that it is in compliance with the Web service policy For example, if the Web service requires encrypted request messages, and the client does not send one, then the client will receive an error back from the Web service directly If on the other hand the client implements its own copy of the policy framework file, then the issue will be caught at the client rather than rejected by the Web service This gives the client more control in heading off potential policy violations early If this all seems confusing, just keep in mind that the client is dependent on the service to set policy.

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If you were paying attention as you explored the out-of-the-box workflows, you d have noticed that they contain a pretty nifty interface for indicating the participants in your workflow. In InfoPath forms, it looks like Figure 9-8. In ASPX forms, it is similar, but looks like Figure 9-9.

The number of whole days in the interval. The number of whole hours in the interval. The number of whole minutes in the interval. The number of whole seconds in the interval. A literal string (see Listing 22-7 for an example). The escape character.

At some level it really does not matter how the client gets informed of the service policy, or how it verifies policy compliance, just as long as the policy requirements get implemented For example, if the service requires incoming requests to be digitally signed, then the client simply needs to know this and then implement this Otherwise, the client s requests will get rejected by the service Ultimately, you should use policy files to the degree that they will save you from having to manually write verification code for SOAP messages In closing the discussion on the discovery of policy framework files, I should note another major shortcoming related to the lack of automatic discovery Policy framework files do not currently have an easy way to integrate with WSDL documents.

To bind controls to an object, choose the Data Add New Data Source menu option in Visual Studio to bring up the Data Source Configuration Wizard. Choose the Object option in the first step, as shown in Figure 9-6.

Up until now, we have come to expect that WSDL documents contain all of the information that is required for a client to bind to a Web service While this is still largely true, there are exceptions, especially with the newer and evolving specifications such as WS-Policy It is highly likely that policy information will be incorporated into the next version of the WSDL specification, although as of now it is unclear exactly where it will fit I am bringing this point up because you will either come across it in your own research or, as I did, you will start to realize this shortcoming once you start working with policy framework files The WS-Policy specification has firm traction and fills an important niche, so it is only a matter of time before it is integrated with the WSDL specification..

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