How to use IEnumerator in IEnumerable?
How to use IEnumerator in IEnumerable?
If you go to the definition of the IEnumerable interface, you will see this interface has a method GetEnumerator () that returns an IEnumerator object back. In short, this IEnumerable uses IEnumerator internally.
How to get an enumerator that iterates through the Dictionary?
C# | Get an enumerator that iterates through the Dictionary. Dictionary .GetEnumerator method is used to return an enumerator that iterates through the Dictionary .
What is the IEnumerable interface in Java?
The IEnumerable interface actually uses IEnumerator. The main reason to create an IEnumerable is to make the syntax shorter and simpler. If you go to the definition of the IEnumerable interface, you will see this interface has a method GetEnumerator () that returns an IEnumerator object back.
Why is it recommended to use foreach instead of using enumerator?
Therefore, using foreach is recommended, instead of directly manipulating the enumerator. Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection. Current returns the same object until either MoveNext or Reset is called.
Why does MoveNext return false when changing enumerator?
When the enumerator is at this position, subsequent calls to MoveNext also return false until Reset is called. If changes are made to the collection, such as adding, modifying, or deleting elements, the behavior of MoveNext is undefined.
How do I move an enumerator from one collection to another?
After an enumerator is created or after the Reset method is called, an enumerator is positioned before the first element of the collection, and the first call to the MoveNext method moves the enumerator over the first element of the collection.
Is the IEnumerator ready for invalidoperationexception?
We are almost there, but not quite yet. According to the IEnumerator especification, Reset and MoveNext must throw an InvalidOperationException if the collection is modified after the Enumerator has been created: So the enumerator needs to know if the collection has been modified, so that it can throw an InvalidOperationException when necessary.
