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Application security is often a challenging issue. Applications need to be able to authenticate the user, which means that they need to verify the user s identity. The result of authentication is not only that the application knows the identity of the user, but that the application has access to the user s role membership and possibly other information about the user collectively, I ll refer to this as the user s profile data. This profile data can be used by the application for various purposes, most notably authorization. The framework directly supports integrated security. This means that you can use objects within the framework to determine the user s Windows identity and any domain or Active Directory (AD) groups to which they belong. In some organizations, this is enough: all the users of the organization s applications are in the Windows NT domain or AD, and by having them log in to a workstation or a website using integrated security, the applications can determine the user s identity and roles (groups). In other organizations, applications are used by at least some users who are not part of the organization s NT domain or AD. They may not even be members of the organization in question. This is very often the case with web and mobile applications, but it s surprisingly common with Windows applications as well. In these cases, you can t rely on Windows integrated security for authentication and authorization. To complicate matters further, the ideal security model would provide user profile and role information not only to server-side code, but also to the code on the client. Rather than allowing the user to attempt to perform operations that will generate errors due to security at some later time, the UI should gray out the options, or not display them at all. This requires that the developer have consistent access to the user s identity and profile at all layers of the application, including the UI, Business Logic, and Data Access layers. Remember that the layers of an application may be deployed across multiple physical tiers. Due to this fact, there must be a way of transferring the user s identity information across tier boundaries. This is often called impersonation. Implementing impersonation isn t too hard when using Windows integrated security, but it s often problematic when relying solely on, say, COM+ role-based security, because there s no easy way to make the user s COM+ role information available to the UI developer.
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Table 10-15. Properties of the SPWorkflowTemplate Class Likely to Be Used by Developers
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material and make it work in Office XP and maybe even Office 2000, but I m not going to be looking at either of those here.
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Sometimes the data access layer can be as simple as a series of methods that use ADO.NET directly to retrieve or store data. In other circumstances, the data access layer is more complex, providing a more abstract or even metadata-driven way to get at data. In these cases, the data access layer can contain a lot of complex code to provide this more abstract data access scheme. The framework created in this book doesn t restrict how you implement your data access layer. The examples in the book will work directly against ADO.NET, but you could also use a metadata-driven data access layer if you prefer. Another common role for the data access layer is to provide mapping between the objectoriented business logic and the relational data in a data store. A good object-oriented model is almost never the same as a good relational database model. Objects often contain data from multiple tables, or even from multiple databases; or conversely, multiple objects in the model can represent a single table. The process of taking the data from the tables in a relational model and getting it into the objectoriented model is called object-relational mapping (ORM), and I ll have more to say on the subject in 2.
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When a rule method is invoked by the CheckRules() method, it returns true or false. If it returns false, the broken rule will be recorded into a BrokenRulesCollection. Here s the code from CheckRules() that implements this behavior: lock (BrokenRulesList) { if (ruleResult) { // the rule is not broken BrokenRulesList.Remove(rule); } else { // the rule is broken BrokenRulesList.Add(rule); if (rule.RuleArgs.Severity == RuleSeverity.Error) previousRuleBroken = true; } }
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The StringBuilder class includes a range of members that help you manipulate the contents of strings. These are summarized in Table 16-7.
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You can add the JournalOwnership property to the Frame object in the MainPage.xaml file, which defines a frame either as being responsible for managing its own navigation history, or integrating with the Web browser journal. By default, it is set to Automatic, which automatically records navigation history to the browser journal, allowing navigation integrated with the browser. In this case, now you can use the back and forward buttons to navigate pages within the Silverlight application. You can set the value of the JournalOwnership property to OwnsJournal to store history only in the Frame control journal. If set to UsesParentJournal, then the Frame control will follow the settings of the parent Frame control s JournalOwnership property. If there is no parent Frame control, then the navigation history will be stored in the browser journal. Note that if you are running an out-of-browser application, you cannot implement the navigation integrated with the browser. It will always run in the OwnsJournal mode while running in the out-of-browser mode. You also need to add an iframe named _sl_historyFrame to the page hosting the Silverlight application plug-in, which is already added as part of the hosting pages (ASPX and HTML) created as
The IL instruction set contains three instructions intended for the direct method calls (well, direct in the sense that all these instructions directly specify the method being called; some purists would not consider a virtual call direct, because under the hood it is done via the v-table): jmp <token> (0x27). Abandon the current method and jump to the target method, specified by <token>, transferring the current arguments in their present state (which may be different from the original state, because the calling method could change the argument values before the jump). Everything else of the current method, including local variables and locally allocated memory, is abandoned. At the moment jmp is invoked, the evaluation stack must be empty, and the arguments are transferred automatically. Because of this, the signature of the target method must exactly match the signature of the method invoking jmp. This instruction should not be used within EH blocks .try, catch, filter, fault, or finally blocks, discussed in 14 or within a synchronized region (the code segment protected by a thread lock, such as a mutex). The jmp instruction is unverifiable. call <token> (0x28). Call an instance or static method nonvirtually. You can also call a virtual method, but in this case it is called not through the type s v-table. (If this sounds somehow vague to you, you might want to return to 10 and, more precisely, to the sample file The real difference between virtual and nonvirtual instance methods becomes obvious when you create an instance of a class, cast it to the parent type of the class, and then call instance methods on this child-posing-as-parent instance. The nonvirtual methods are called directly, bypassing the child type s v-table,
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