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C# | Get an enumerator that iterates through Collection<T>

Last Updated : 11 Jul, 2025
Collection<T>.GetEnumerator Method is used to get an enumerator that iterates through the Collection<T>. Syntax: 
public System.Collections.Generic.IEnumerator<T> GetEnumerator ();
Return Value: This method returns an IEnumerator<T> for the Collection<T>. Below programs illustrate the use of above discussed method: Example 1:
Output: 
The number of elements in myColl are: 5
A
B
C
D
E
Example 2:
Output: 
The number of elements in myColl are: 4
45
56
78
75
Note:
  • The foreach statement of the C# language hides the complexity of the enumerators. 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. MoveNext sets Current to the next element.
  • An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and its behavior is undefined.
  • This method is an O(1) operation.
Reference:
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