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The advantages include automatic garbage collection, memory management, support for versioning and security. These advantages are provided through .NET FCL and CLR, while with the unmanaged code similar capabilities had to be implemented through third-party libraries or as a part of the application itself.
Since COM objects were written before .NET, apparently they are unmanaged.
Any code not written in the Microsoft .NET framework environment is UNMANAGED. So naturally COM+ is unmanaged because it is written in Visual Basic 6.
Yes, through Runtime Callable Wrapper (RCW) or PInvoke.
Use the Type Library Import utility shipped with SDK. tlbimp COM object.dll /out:.NETobject.dll or reference the COM library from Visual Studio in your project.
You can only import your own objects. If you need to use a COM component from another developer, you should obtain a Primary Interop Assembly (PIA) from whoever authored the original object.
You *can* import COM objects, even if they are not your own. It is recommended that you obtain the Primary Interop from the vendor, but not required. The most common problem importing a COM DLL is that it exposes objects that form part of a separate COM DLL. You can generate entropy for these additional DLLs, and then refer to them when importing the problem DLL.
Supply a DllImport attribute. Declare the methods in your .NET code as static extern. Do not implement the methods as they are implemented in your unmanaged code, you’re just providing declarations for method signatures.
Yes, just make sure you re-declare that struct, so that managed code knows what to do with it.
Yes, but few things should be considered first. Classes should implement interfaces explicitly. Managed types must be public. Methods, properties, fields, and events that are exposed to COM must be public. Types must have a public default constructor with no arguments to be activated from COM. Types cannot be abstract.
The .NET Framework extends the COM model for reusability by adding implementation inheritance. Managed types can derive directly or indirectly from a COM coclass; more specifically, they can derive from the runtime callable wrapper generated by the runtime. The derived type can expose all the method and properties of the COM object as well as methods and properties implemented in managed code. The resulting object is partly implemented in managed code and partly implemented in unmanaged code.
COM methods report errors by returning HRESULTs; .NET methods report them by throwing exceptions. The runtime handles the transition between the two. Each exception class in the .NET Framework maps to an HRESULT.
COM Interop Related Tutorials
|MVC Framework Tutorial||Microsoft Entity Framework Tutorial|
|Framework7 Tutorial||Windows Presentation Foundation(WPF) Tutorial|
|Windows Communication Foundation (WCF) Tutorial|
COM Interop Related Interview Questions
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|Asp Dot Net Mvc 4 Interview Questions||Asp Dot Net Mvc Interview Questions|
|DCOM Interview Questions||.Net Deployment Interview Questions|
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