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The .NET Framework runs on top of Microsoft Windows. This means that the .NET Framework must be built using technologies that Windows understands. For starters, all managed module and assembly files must use the Windows portable executable (PE) file format and be either a Windows EXE file or a dynamic link library (DLL). When developing the CLR, Microsoft implemented it as a COM server contained inside a DLL; that is, Microsoft defined a standard COM interface for the CLR and assigned GUIDs to this interface and the COM server. When you install the .NET Framework, the COM server representing the CLR is registered in the Windows registry just like any other COM server. If you want more information about this topic, refer to the MSCorEE.h C++ header file that ships with the .NET Framework SDK. This header file defines the GUIDs and the unmanaged ICorRuntimeHost interface definition. Any Windows application can host the CLR. However, you shouldn t create an instance of the CLR COM server by calling CoCreateInstance; instead, your unmanaged host should call the CorBindToRuntimeEx function (prototyped in MSCorEE.h). The CorBindToRuntimeEx function is implemented in the MSCorEE.dll, which is usually found in the C:\Windows\System32 directory. This DLL is called the shim, and its job is to determine which version of the CLR to create; the shim DLL doesn t contain the CLR COM server itself. You see, version 1.0 of the .NET Framework comes with two versions of the CLR COM server. The MSCorWks.dll file contains the workstation version; this version is tuned to offer better performance in single processor, workstation environments. The MSCorSvr.dll file contains the server version, which is tuned to offer better performance in multiprocessor, server environments. In the future, Microsoft will be producing new versions of the CLR, and these can be installed on a user s hard disk as well. When CorBindToRuntimeEx is called, its parameters allow the host to specify which version of the CLR it would like to create. The version information indicates workstation vs. server as well as a version number. CorBindToRuntimeEx uses the specified version information and gathers some additional information of its own (such as how many CPUs are installed in the machine and which versions of the CLR are installed) to decide which version of the CLR to load the shim might not load the version that the host requested. By default, the shim examines the managed executable file and extracts the information indicating what version of the CLR the application was built and tested with. However, an application can override the default by placing entries in its XML configuration file (as described in s 2 and 3). The following sample XML configuration file shows how an application can tell the shim to load a particular CLR version:
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<configuration> <startup> <requiredRuntime version="v1.0.0.0" safemode="true"/> </startup> </configuration>
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After examining this information, the shim loads the corresponding CLR version. If safemode is set to false (the default), the shim loads the most recently installed version of the CLR that is compatible with the version the application wants. Microsoft determines which versions of the CLR are compatible with other versions by creating some registry settings. You can see the CLR version policy settings by examining the values under the following registry subkey:
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HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework\Policy
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You should never modify any of the values under this registry subkey; when you install a new version of the .NET Framework, the setup program will modify these settings based on Microsoft s compatibility testing. The CorBindToRuntimeEx function returns a pointer to an unmanaged ICorRuntimeHost interface (also defined in MSCorEE.h). The hosting application can call methods defined by this interface to initialize the CLR. The host can also call methods telling the CLR what assembly to load and what method to start executing. The section "Loading the Common Language Runtime" on page 9 in 1 explains how all this works for managed console and Windows Forms applications.
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