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Microsoft Exams Tutorial Slipstreaming Service Packs and Hotfixes
You are using Visual Studio .NET to develop an application to replace a COM-based application. You
are assigned to write a .NET class that will be used by client applications as a COM object. Your class
code is being moved and modified while development continues on the new application.
You want to minimize any possible disruption to the COM interface as a result of code changes.
Which code segment should you use?
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A. [ClassInterface()]
public Class CKClassToExpose {
public int Calc() {
// Implementation code goes here.
}
}
B. [Guid("9ED54F84-A89D-4fcd-A854-44251E925F09")]
public interface ICKClassToExpose {
public int Calc();
}
[ClassInterface[ClassInterfaceType.None)]
public int Calc() {
// Implementation code goes here.
}
}
C. [Guid("9ED54F84-A89D-4fcd-A854-44251E925F09")]
[ComVisible(true)]
public class CKClassToExpose {
public int Calc() {
// Implementation code goes here.
}
}
D. [ClassInterface(ClassInterfaceType.AutoDispatch)]
public class CKClassToExpose {
public int Calc() {
// Implementation code goes here.
}
}
Answer: D
Explanation: The ClassInterfaceType.AutoDispatch indicates that the class only supports late binding for
COM clients. A dispinterface for the class is automatically exposed to COM clients on request. The
dispinterface does not exhibit versioning problems because of the late bindings.
Incorrect Answers
A: ClassInterface() is not correct usage.
B: The ClassInterfaceType.None indicates that no class interface is generated for the class. If no
interfaces are implemented explicitly, the class will only provide late bound access through
IDispatch. Users are expected to expose functionality through interfaces that are explicitly
implemented by the class.
C: ComVisible does not achieve much. Public classes are visible by default.