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|
To |
Do this |
Example |
Make a class enumerable, allowing it to support the foreach construct. |
Implement the IEnumerable interface and provide a GetEnumerator method that returns an IEnumerator object. |
public class Tree<T>:IEnumerable<T>
{
...
IEnumerator<T> GetEnumerator()
{
...
}
} |
Implement an enumerator not by using an iterator. |
Define an enumerator class that implements the IEnumerator interface and that provides the Current property and the MoveNext (and Reset) methods. |
public class TreeEnumerator<T> :
IEnumerator<T>
{
...
T Current
{
get
{
...
}
}
bool MoveNext()
{
...
}
} |
Define an enumerator by using an iterator. |
Implement the enumerator by using the yield statement indicating which items should be returned and in which order. |
IEnumerator<T> GetEnumerator()
{
for (...)
yield return ...
} |
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