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Often, the majority of the executed code is not written in the application itself, but in various DLLs that the application loads. There are significant differences between application startup and DLL startup. When a mixed-code EXE file is loaded to start an application, the CLR is automatically initialized. In mixed-code DLLs, this can be different. Mixed-code DLLs can be used to delay-load the CLR. This means that the CLR is initialized only when managed code is executed. In addition to that, DLL startup code is executed with special restrictions that must be considered when writing mixed-code DLLs. To understand how this delay-loading feature works, and to avoid some critical initialization pitfalls, it is necessary to discuss the startup of DLLs, too. DLLs can also have a PE entry point. The signature for a DLL entry point is somewhat more complex: BOOL __stdcall PEEntryPoint_DLL( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved ); Unlike an application s entry point, a DLL entry point is called more than once. It is called once when the DLL is loaded into a process and once when it is unloaded. Furthermore, it can be called twice for each thread created after the DLL is loaded: once when the thread is starting up and once when it is shutting down. Many developers know this signature from a function named DllMain, but precisely spoken, DllMain is usually not the PE entry point of a DLL. For native DLLs, the entry point is usually a function named _DllMainCRTStartup. It is the task of this function to initialize the CRT at startup and to perform the CRT deinitialization when the DLL is unloaded. The programmer can implement a function named DllMain to do custom initialization and uninitialization. When _DllMainCRTStartup has initialized the CRT, it forwards the call to DllMain. When _DllMainCRTStartup is called due to a DLL unloading, it first calls DllMain, and then it performs the uninitialization of the CRT. For mixed-code DLLs, there is an additional layer. When the linker produces a DLL assembly, a function named _CorDllMain is used as the PE entry point. This function enables the delay-loading of the CLR. Instead of initializing the CLR directly, it patches all thunks for managed functions that can be handed out to the native world. In 9, I explained that the compiler and linker generate .vtfixup metadata and an interoperability vtable for every managed function that can be called from native code. Each of the interoperability vtables is patched during mixed-code DLL startup. This patch introduces some code that loads the CLR if it has not been loaded already and that performs the initialization of the managed parts of an assembly if this has not been done before. The following sample code shows a DLL that can delay-load the CLR: // Lib1.cpp // compile with "CL /clr /LD Lib1.cpp" extern "C" __declspec(dllexport) void __stdcall fManaged() { System::Console::WriteLine("fManaged called"); }
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Implementing a channel adapter Supporting distributed transactional technologies Implementing a message router Transferring context and providing location transparency The remainder of the chapter will walk through each functional area in turn, discussing the implementation of the classes supporting the concept. Though the data portal support for custom authentication and impersonation will be covered in this chapter, the Csla.Security. BusinessPrincipalBase class will be covered in 5. The data portal is exposed to the business developer through the Csla.DataPortal class. This class implements a set of Shared methods to make it as easy as possible for the business developer to create, retrieve, update, or delete objects. All the channel adapter behaviors are hidden behind the Csla.DataPortal class. The Csla.DataPortal class makes use of methods from the Csla.MethodCaller class.
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The CSLA .NET framework doesn t actually dictate this approach. Rather, it s a design choice on my part because it makes the use of the business objects more intuitive from the UI developer s perspective. It s quite possible to allow the UI code to create child objects directly by making the child factory methods Public; the collection s Add() method would then accept a prebuilt child object as a parameter. I think that s less intuitive, but it s perfectly valid, and you can implement your objects that way if you choose.
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Figure 7-13. Classes from other assemblies can access public classes but cannot access internal classes.
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Understand the typical Silverlight/Blend/Visual Studio workflow for creating Silverlight applications Understand the Blend 4 IDE what tools are available and how to use them properly Understand XAML and C# basics, as well as some advanced C# constructs such as a CLRInstance of a DataFactory and a very popular user interface design pattern called Model-View-ViewModel (MVVM) Know the basic Silverlight content element controls
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