B: Validating Method Parameters in .NET framework

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Appendix B: Validating Method Parameters
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b If the expected type is an Array, it loops through the array elements and executes step (a) for each array element
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What s a parameterArray
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A parameterArray is a concept in the Microsoft AJAX Library that s used only for validation If an expectedParam is marked as a parameter Array, the validation routine knows to treat any parameter that isn t directly assigned to a named parameter as a member of an array of ending arguments For instance, in the registerClass method, we can pass in 0 to n interface types that our class implements We do this by providing the interface types in a comma-separated list at the end of the method Simply put, we just pass them in to the method as we would a normal parameter In the registerClass method, the interfaceTypes expectedParam is marked as a parameterArray When the validation routine loops through the expectedParams array and reaches the interfaceTypes expectedParam, it validates the remaining arguments passed in to the method call against the interfaceTypes expectedParam de nition In this case, the de nition states that if the parameter passed in isn t an interface, throw an error The parameterArray idea is similar to the params[] keyword in C#, but C# uses the param keyword to de ne a method that can take 0 to n parameters As we now know, JavaScript doesn t care how many arguments are passed in to a method; so unlike C#, where the params[] keyword changes how the method accepts parameters, the parameter Array idea is used only for validation purposes Finally, for the parameterArray validation to occur properly, the parameterArray must be the last parameter of the method
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ASPNET Handlers and Modules
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SPNET handlers and modules provide the underlying support that makes ASPNET AJAX function, and a good understanding of how they work can go a long way In this appendix, we cover how HTTP handlers and modules work and how they t into the overall ASPNET 20 application lifecycle
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ASPNET Application Lifecycle
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The application lifecycle that ASPNET 20 goes through when processing a request consists of quite of few layers As shown in Figure C1, the ow of a request from a client starts with the request coming into IIS and logic being applied to determine whether the ASPNET runtime will be processing the request If the le extension of the request ends with aspx, ascx, ashx, asmx, or svc, the ASPNET 20 runtime will handle the request, and the ApplicationManager will create an application domain for the request This application domain is used to provide isolation between the various web applications in IIS and allows each web application to be managed separately The byproduct of creating an application domain is the creation of the HTTP runtime, which consists of the HttpContext, HttpRequest, HttpResponse, and HttpApplication objects that work together to processes the request The HttpContext class contains objects that are
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Appendix C: A SPNET Handlers and Module s
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speci c to the current application request, such as the HttpRequest and HttpResponse objects The HttpRequest object contains information about the current request, including cookies and browser information The HttpResponse object contains the response that is sent to the client, including all rendered output and cookies It is the HttpApplication pipeline that is contained in the HttpApplication object that is of most interest to us because the pipeline is responsible for the instantiation of the HTTP handlers and modules for ASPNET 20
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Application Domain HTTP Runtime HTTP Request HTTP Response
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Response
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Figure C1 ASPNET application lifecycle
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HTTP Handlers
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In their simplest form, HTTP handlers run in response to a request into an ASPNET application and are part of the HttpApplication pipeline illustrated in Figure C1 In the course of processing the request, the
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HTTP Handlers HttpApplication pipeline loads the speci c handler based on the le exten-