Bitrate = 80 kbps

Mono

Quality = Very high (q = 0)

C13L1Q7: When generating metadata from a type library, what is the resulting assembly called?

Answer: An interop assembly.

C13L1Q8: What are the four options for generating an interop assembly containing type metadata?

Answer:

• Visual Studio.
• Type Library Importer (Tlbimp.exe).
• The TypeLibConverter class.
• Custom wrappers.

C13L1Q9: What can the TypeLibConverter class do that the Type Library Importer can not?

Answer: It can convert an in-memory type library to metadata.

C13L1Q10: What are the four high level steps to expose a COM component to the .NET Framework?

Answer:

1. Import a type library as an assembly.
2. Create COM types in managed code.
3. Compile an interop project.
4. Deploy an interop application.

PragC3Q1: What are the three benefits of plain text?

Answer:

• Insurance against obsolescence
• Leverage
• Easier testing

PragC3Q2: What are three situations that make tracing statements invaluable?

Answer:

• Concurrent processes
• Real-time systems
• Event-based applications

C13L1Q11: How are COM types that are defined in an assembly used differently from other managed types?

Answer: They aren't used differently (tricky).

C13L1Q12: How is compiling an interop project different from compiling a managed project?

Answer: It isn't different (tricky).

C13L1Q13: What three things does an interop application contain?

Answer:

• A .NET client assembly.
• One or more interop assemblies.
• One or more registered COM components.

C13L1Q14: Where should private assemblies be installed?

Answer: The same directory as the application.

C13L1Q15: What must a shared assembly have and where is it installed?

Answer: It must have a strong name and be installed in the Global Assembly Cache (GAC).

C13L1Q16: What is a primary interop assembly?

Answer: A unique, vendor-supplied, strong named, interop assembly that contains type definitions (as metadata) of types implemented with COM.

C13L2Q4: What are the five guidelines for qualifying .NET types for interoperation?

Answer:

• Classes should implement interfaces explicitly.
• Managed types must be public.
• Methods, properties, fields and events must be public.
• Types must have a public default constructor to be activated from COM.
• Types can not be abstract.

C13L2Q5: What public parts of a class are not exposed to COM clients?

Answer: Parameterised constructors, static methods and constant fields.

C13L2Q6: What does the Assembly Registration tool do and what .NET class provides the equivalent functionality?

Answer: The Assembly Registration tool generates a type library and then registers it so that COM clients can use the .NET class transparently, or it can unregister an assembly. The equivalent class is RegistrationServices.

C13L2Q7: What is the difference between the Type Library Exporter and the Assembly Registration tool?

Answer: The Type Library Exporter generates a type library but does not register it. The Assembly Registration tool does both.

C13L2Q8: How do you use the Type Library Exporter to generate a subset of the types defined in an assembly?

Answer: You can't - the entire assembly is converted at once (tricky).

C13L2Q9: How can an interop assembly be activated from any COM client?

Answer: After registering it, install it in the Global Assembly Cache (GAC).

C13L2Q10: When using the Assembly Registration tool, what does the /tlb option do?

Answer: It causes the Assembly Registration tool to generate a type library in addition to registering the types.

C13L2Q11: When should the /tlb option of the Assembly Registration tool not be used?

Answer: If the assembly was produced by the Type Library Importer.

ITQ6: What is the difference between Cast and Convert in T-SQL?

Answer: Cast is ANSI compliant. Convert is specific to SQL Server and allows some formatting options.