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Part I CLR Basics
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When the compiler compiles this code, the result is a type that has a number of fields and methods defined in it . You can easily see this by using the IL Disassembler tool (ILDasm .exe) provided with the .NET Framework SDK to examine the resulting managed module, which is shown in Figure 1-7 .
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FIguRE 1-7 ILDasm showing Test type s fields and methods (obtained from metadata)
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Table 1-4 shows how the programming language constructs got mapped to the equivalent CLR fields and methods .
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TABLE 1-4
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Test Type s Fields and Methods (Obtained from Metadata)
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Member Type
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Field Method Method Method Method Method Method Method Method Method Method Method
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AnEvent .ctor Finalize add_AnEvent get_AProperty get_Item op_Addition op_Equality op_Inequality remove_AnEvent set_AProperty set_Item
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Equivalent Programming Language Construct
Event; the name of the field is AnEvent and its type is System.EventHandler . Constructor . Finalizer .
Event add accessor method . Property get accessor method . Indexer get accessor method . + operator . == operator . != operator . Event remove accessor method . Property set accessor method . Indexer set accessor method .
The additional nodes under the Test type that aren t mentioned in Table 1-4 .class, .custom, AnEvent, AProperty, and Item identify additional metadata about the type . These nodes don t map to fields or methods; they just offer some additional information
1 The CLR s Execution Model
about the type that the CLR, programming languages, or tools can get access to . For example, a tool can see that the Test type offers an event, called AnEvent, which is exposed via the two methods (add_AnEvent and remove_AnEvent) .
Interoperability with unmanaged Code
The .NET Framework offers a ton of advantages over other development platforms . However, very few companies can afford to redesign and re-implement all of their existing code . Microsoft realizes this and has constructed the CLR so that it offers mechanisms that allow an application to consist of both managed and unmanaged parts . Specifically, the CLR supports three interoperability scenarios:
Managed code can call an unmanaged function in a DLL Managed code can easily call functions contained in DLLs by using a mechanism called P/Invoke (for Platform Invoke) . After all, many of the types defined in the FCL internally call functions exported from Kernel32 .dll, User32 .dll, and so on . Many programming languages will expose a mechanism that makes it easy for managed code to call out to unmanaged functions contained in DLLs . For example, a C# application can call the CreateSemaphore function exported from Kernel32 .dll . Managed code can use an existing COM component (server) Many companies have already implemented a number of unmanaged COM components . Using the type library from these components, a managed assembly can be created that describes the COM component . Managed code can access the type in the managed assembly just as any other managed type . See the TlbImp .exe tool that ships with the .NET Framework SDK for more information . At times, you might not have a type library or you might want to have more control over what TlbImp .exe produces . In these cases, you can manually build a type in source code that the CLR can use to achieve the proper interoperability . For example, you could use DirectX COM components from a C# application . Unmanaged code can use a managed type (server) A lot of existing unmanaged code requires that you supply a COM component for the code to work correctly . It s much easier to implement these components by using managed code so that you can avoid all of the code having to do with reference counting and interfaces . For example, you could create an ActiveX control or a shell extension in C# . See the TlbExp .exe and RegAsm .exe tools that ship with the .NET Framework SDK for more information .
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