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The following table summarizes the various valid (yes) and invalid (no) keyword combinations.
Keyword |
Interface |
Abstract class |
Class |
Sealed class |
struct |
Abstract |
no |
yes |
no |
no |
no |
New |
yes* |
yes |
yes |
yes |
no† |
override |
no |
yes |
yes |
yes |
no‡ |
private |
no |
yes |
yes |
yes |
yes |
protected |
no |
yes |
yes |
yes |
no** |
public |
no |
yes |
yes |
yes |
yes |
sealed |
no |
yes |
yes |
yes |
no |
virtual |
no |
yes |
yes |
no |
no |
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*An interface can extend another interface and introduce a new method with the same signautre. †A struct implicitly derives from System.Object, which contains methods that the struct can hide. ‡A struct implicitly derives from System.Object, which contains no virtual methods. **A struct is implicitly sealed and cannot be derived from. |
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If you want to continue to the next chapter
Keep Visual Studio 2005 running and turn to Chapter 13.
If you want to exit Visual Studio 2005 now
On the File menu, click Exit. If you see a Save dialog box, click Yes.
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