By Derek Beyer
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Extra info for C sharp Com+ programming
CDog. In the registry file shown previously, I have highlighted the most interesting key of all. We can learn a lot from this particular registry entry. dll. NET. This dll implements the COM Callable Wrapper discussed in the next section. NET class to run in either a single threaded apartment or a multi-threaded apartment—depending on the apartment model the unmanaged client is running in. Finally, notice a brand new registry entry for the assembly. dll which assembly is implementing the class the ProgID identifies.
Attributes can be applied at the assembly level. Specific to COM+, an assembly can be attributed to affect the name of the COM+ application, the description, and whether the classes are installed in a library or server application. EnterpriseServices namespace and can be used to specify the name of the COM+ application, its description, and the library or server setting, respectively. Note COM+ applications can be installed as either library applications or server applications. Library applications run in the same process as their clients, but server applications run in a host process outside of their client's process.
The ObjectContext component used in Visual Basic 6 supports the same set of methods, which incidentally perform the same functions as those from the ContextUtil class. COM+ supports an attribute called autodone. This attribute is applied to a method by using the Component Services Explorer. The Auto-Done attribute changes the done bit's default value from false to true when a method is first called. NET Framework provides this support through the AutoComplete attribute, which you encounter later in the chapter.
C sharp Com+ programming by Derek Beyer