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Listing 9-7. Disambiguating Name Collisions // class_interface_method_ambiguity.cpp using namespace System; interface class IA { void f(); }; ref class A : IA { public: // Note that new is not used here. void f() { Console::WriteLine("A::f"); } // explicit implementation syntax virtual void fIA() = IA::f { Console::WriteLine("A::fIA implementing IA::f"); } }; int main() { A^ a = gcnew A(); IA^ ia = a; ia->f(); a->f(); } Here is the output of Listing 9-7: A::fIA implementing IA::f A::f As you can see, the method that gets called is determined by whether the method is accessed through the interface or through the object. Now let s turn to the case of a class implementing two interfaces with the same name. Inheritance in C++/CLI (and in other CLI languages such as C# and VB .NET) is different from interface inheritance in some other languages, such as Java. The big difference between the interface inheritance model in Java and the CLI is that CLI interfaces are independent of each other, whereas in Java, interfaces can interfere with each other when name collisions arise, such as when two or more interfaces implemented by the same type have methods with

Figure 8-4. Comparing reference types for equality Objects of type string are also reference types, but they are compared differently. When strings are compared for equality, they are compared in length and content, which is case sensitive. If two strings have the same length and the same case-sensitive content, the equality comparison returns true, even if they occupy different areas of memory. This is called a deep comparison. Delegates are also reference types, and also use deep comparison. When delegates are compared for equality, the comparison returns true if both delegates are null, or if both have the same number of members in their invocation lists, and the invocation lists match. When comparing numeric expressions, the types and values are compared. When comparing enum types, the comparisons are done on the underlying values of the operands.

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When users visit our web site, we d like to store information for them as they move from page to page. This ability to identify users and manage their private session state is often referred to as session tracking. Although HTTP is stateless, and does not include built-in support for session tracking, several techniques are commonly used to track a session across multiple page requests. As a default strategy, servlets can store a cookie on the browser machine. The browser then automatically sends the cookie to the server every time the user requests a page. In this way, the server is able to identify the client. Alternatively, the client can be identified by rewriting all requested page URLs to include the client s unique session identifier. By inspecting each requested URL, the server is then able to recognize the client. Fortunately, the Java Servlet API defines an HttpSession class that offers a convenient fa ade to session tracking. The beauty of this API is that the session-tracking details are hidden from the servlet programmer. If the user s browser won t take a cookie, for example, then the server can resort to URL rewriting.

Begins an asynchronous request to obtain a Stream to write data. Returns a Stream. Use this in the asynchronous callback method passed to BeginGetRequestStream to get the Stream to write your request to. Begins an asynchronous request to communicate with a server. Returns a WebResponse; provides access to a Stream containing the data downloaded from the server. Cancels an executing asynchronous operation.

Locate the URL on the Silverlight.net Get Started page for the Silverlight 4 Tools for Visual Studio 2010 it should be at the end of the block of text containing the first Visual Studio 2010 link that you clicked. This will install the developer runtime for Silverlight 4, the Visual Studio 2010 Project Templates that allow you to create Silverlight 4 applications in Visual Studio 2010, and the Silverlight 4 Software Development Kit (SDK). This is the very minimum you need to be able to develop Silverlight applications. However, we are still missing one piece of software that I consider essential to Silverlight development, and that is Blend! Go on to the next section and install Expression Blend.

you query or load it. Here are some rules of thumb:

Summary

parse method could handle multiple different address formats, and generally evolve into a cohesive reusable object.

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