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Figure 20-5. Comparing interface-based and non-interface-based enumerators One possible problem with the noninterface enumerator implementation is that types from other assemblies might expect enumeration to be implemented using the interface method. If these objects attempt to get an enumeration of your class objects using the interface conventions, they won't be able to find them. To solve this problem, you can implement both forms in the same classes. That is, you can create implementations for Current, MoveNext, Reset, and GetEnumerator at the class level and also create explicit interface implementations for them. With both sets of implementations, the type-safe, more efficient implementation will be called by foreach and other constructs that can use the noninterface implementations, while the other constructs will call the explicit interface implementations. An even better way, however, is to use the generic forms, which I describe next.

I have worked in a development/consultancy capacity in the fields of healthcare, government, CRM, finance, and the automotive industry and have been lucky enough to work around the world in the UK, Ireland, the Middle East, America, and Australia I currently live in Melbourne, Australia, where I work as a senior developer I am occasionally exposed to sophisticated Australian pom humor, which is inevitably delivered with a bad 1820s cockney London accent Australians are, however, some of the most welcoming, friendly, and fun people I have met, so I am thankful to the new friends I have made here who have made the transition easier I am active in the programming community and have spoken at a number of conferences and usergroup events In the UK I set up and ran the Surrey-based net user group DevEveningcouk I was awarded the MVP C# award in October 2008.

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Figure 6-16. The HeaderedContentControl is a form of ContentControl that has two pieces of content rather than one. They are the Header and the Content.

The third form of enumerator uses the generic interfaces IEnumerable<T> and IEnumerator<T>. They are called generic because they use C# generics. Using them is very similar to using the nongeneric forms. Essentially, the differences between the two are the following: With the nongeneric interface form The GetEnumerator method of interface IEnumerable returns an enumerator class instance that implements IEnumerator. The class implementing IEnumerator implements property Current, which returns a reference of type object, which you must then cast to the actual type of the object.

I am currently working to bring the DeveloperDeveloperDeveloper day conference format to Melbourne (dddmelbournecom) and set up DevEveningcomau Outside of work I enjoy running and weight training, and I have an interest in artificial intelligence My website is at simpleisbestcouk and you can follow me on twitter at twittercom/alexjmackey..

With the generic interface form The GetEnumerator method of interface IEnumerable<T> returns an instance of a class that implements IEnumerator<T>. The class implementing IEnumerator<T> implements property Current, which returns an instance of the actual type, rather than a reference to the base class object.

The GroupBox puts a border around its content and places the header in the border, at the top left. Some notable things about the GroupBox are the following: You can set the BorderThickness and the Background on a GroupBox. Although it usually consists of text, the Header itself can contain content.

The most important point to notice, though, is that the nongeneric interface implementations are not type-safe. They return references to type object, which must then be cast to the actual types. With the generic interfaces, however, the enumerator is type-safe, returning references to the actual types. Of the three forms of enumerations, this is the one you should implement and use. The others are for legacy code developed before C# 2.0 when generics were introduced.

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