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If this gets confusing, you can consult either Figures 4-6 or 4-7, each including all five of these components. Let s look at how to build each component in turn, going from bottom to top, starting with the external StockTraderServiceQuote Web service.
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RID: TypeDef RID: Event
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class Program { static bool IsOdd(int x) { return x % 2 == 1; }
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int main() { CTemplate<int>^ ctemplate_int = gcnew CTemplate<int>(67); CBridge^ bridge = gcnew CBridge(); bridge->F(ctemplate_int); } If we try to compile assembly2.cpp in Listing 11-26 as follows: cl /clr assembly2.cpp we ll get an error similar to the following: assembly2.cpp assembly2.cpp(12) : error C2664: 'CBridge::F' : cannot convert parameter 1 from 'CTemplate<T> ^' to 'CTemplate<int> ^' with [ T=int ] No user-defined-conversion operator available, or Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast What s the problem You can plainly see that CTemplate<T> with T = int is the same as CTemplate<int>, right Well, no. The truth of the matter is that the CTemplate<int> compiled into the first assembly is not considered the same type as the CTemplate<int> compiled into the second assembly, because the runtime sees them as two different types. The compiler won t let you compile code that tries to do this. The bottom line is that you should confine your template code to intra-assembly code. Don t expose your template classes as public classes. If you want a parameterized type to use in the public classes and methods of an assembly, use a generic type. You may often find yourself defining a generic interface to a template class. You can then use the generic interface over the assembly boundary, and use the template classes freely within each assembly. Listing 11-27 shows how you would declare such a thing. Listing 11-27. Declaring a Generic Interface // // // // generic_interface.cpp Declare your generic interfaces and compile to a DLL. Reference the compiled assembly using #using. Do not reference the source as an included file.
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ContentTemplateContainer Returns a control object that you can then use later to add child controls to. Controls IsInPartialRendering RenderMode RequiresUpdate UpdateMode Returns ControlCollection object that contains the child controls for the UpdatePanel control. Indicates whether the UpdatePanel control is being updated because of an asynchronous postback. Indicates whether an UpdatePanel control s content is enclosed in an HTML <div> or <span> element. Indicates whether the content of the UpdatePanel control will be updated. Indicates when an UpdatePanel control s content is updated. The default is always.
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Figure 14-1. Binding from a projection The overall goal in the development of LINQ to CSLA .NET is to make it possible to use LINQ with CSLA .NET collections and have data binding behavior work as expected. Namely, the goal is to make it so that you can bind to the result of a LINQ query performed against a CSLA .NET collection and have all the behavior you would expect when binding to the entire collection itself. Later in this chapter, I ll provide more detail about how this works.
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Figure 11-6. The breadcrumb control shows you that you are editing the template for a Button control. If you wanted to stop editing this Style, you could either click the arrow icon next to the text GradientButtonStyle in the Objects and Timeline panel or you could click the word [Button] in the
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The bulk of the work you see in Listing 6-24 is to keep the no value over a million microseconds rule (tv_usec) in check. The function GetFrames, shown in Listing 6-25, converts a timeval value into frames. This is the code to detect when you ve taken more than a frame s worth of time.
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Web services enable the creation of another type of interface to business objects. Rather than exposing an interface directly to users, as with Windows forms or web forms, web services expose an interface for use by other, external applications. Those applications can call your web methods to leverage the business functionality and data provided by your application and its business objects. You can design your web services along the lines of MTS or COM+ components, effectively creating a public API for your application. In such a case, most people tend to think of the web service as implementing a tier in an n-tier or a client/server model. In many cases, it is better to follow service-oriented thinking, which specifies that a service (web service or otherwise) is an autonomous entity an independent application, not a tier within a larger application. Service orientation also specifies that your web methods should communicate using a message-based approach, for which a web method accepts a complex type as a message, and returns a complex type as a resulting message. In this chapter, I demonstrated how to create web methods using both approaches, so you can decide which works best in your application. The example web service and client illustrate how you can expose all the functionality of your business objects without duplicating business logic in the web service interface itself. The validation, authentication, and other business logic is all encapsulated entirely in the business objects. 12 will close the book by showing how to create remote data portal hosts for remoting, Web Services, and Enterprise Services. These remote hosts can be used by the Windows Forms, Web Forms, and Web Services interfaces you ve seen in the last three chapters.
suggesting that you are invoking a platform-specific binary. Basically, P/Invoke lets you create a managed entry point to your native function. If the native code you want to call is not exposed as a native, exported function, you can t use P/Invoke. P/Invoke works well for calling Win32 APIs, and it is widely used in CLI languages for this purpose. There are some complexities in using P/Invoke, since you have to declare managed analogs for any native structs that are passed into the function, and this is sometimes tricky. Also, there is considerable overhead due to switching from managed to native code and back again, as you ll see. In addition to P/Invoke, the CLR provides support for COM interop. You can create instances of proxy objects to COM objects in managed code. Usually this will involve automatically creating a wrapper assembly that contains managed types that expose the COM interfaces to your managed code. Visual Studio contains several tools that simplify this process, such as tlbimp.exe, which creates a wrapper assembly from a typelib (TLB file) that is usually present with a COM library. You can also go the other way, exposing managed objects to COM. This process involves attributing the types with COM attributes, specifying, for example, the GUID for the type, and using tlbexp.exe to generate a type library that can be used to instantiate the managed objects from COM as COM objects. All of the previously mentioned interop methods are available to all CLR languages, but in C++/CLI, you have the option of an additional type of interop if you have the C++ source code and can recompile it with the /clr option. Most C++ code will compile with the /clr compiler option with minimal changes, if any. If you do this, you can re-create your native DLL as an assembly. The types are still native, but the instructions are compiled into IL. This code can be used from C++/CLI code (at least in mixed mode) in the same way as you would normally use native C++ code: include the header file and link to the DLL s import library. In pure mode and safe mode, you cannot link in native object files and have the resulting file remain pure or safe. If you can link together object files of different modes, the resulting assembly is downgraded to the lowest common denominator; for example, if you link pure and mixed-mode object files, the result is a mixed-mode assembly. You can put both native classes and types and managed classes and types in the same assembly in pure and mixed mode. This is useful if you want to expose native classes and types to other .NET languages such as C# or Visual Basic. A typical scenario might be that you would take a native class library s source code, recompile it with the /clr option, and, in the same assembly, add managed classes that wrap the native classes that you want to export to other managed languages. These managed wrappers would be marked public and would be visible to the other language. However, the native classes in the DLL would not be accessible to the clients who use the assembly. To support all this, there are various language features and CLR features. Cross-language interop, P/Invoke, and COM interop are CLR features. I ll discuss cross-language interop, P/Invoke, and COM interop in brief. Using native types and managed types together in the same assembly, for example, in order to create a managed wrapper for a native class library, is the main focus of this chapter. You ll learn how to reference a native type in a managed type, and how to reference a managed type in a native type. You ll see pointer types that help in working with interoperability scenarios, such as interior pointers and pinning pointers. You ll also look into converting types between native and managed equivalents. This type of conversion is usually called marshaling. Visual C++ 2008 introduces the marshaling library, which simplifies these types of conversions considerably. Interop is an intriguing, complex subject. A full discussion of all the subtle aspects of interop would be impossible in an introductory text, so this chapter will focus on some basic scenarios
This code produces the following output: Total: 6
the New Storyboards button as shown in Figure 5-36.
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