How to iterate over a collection that supports IEnumerable?

Question

How to loop through a collection that supports IEnumerable?

Answer 1

Regularly for everyone there will be:

foreach (var item in collection) { // do your stuff } 

Answer 2

Along with the methods already proposed for using the foreach , I thought that I also mention that any object that implements IEnumerable also provides an IEnumerator interface using the GetEnumerator method. Although this method is generally not needed, it can be used to manually iterate over collections and is especially useful when writing custom extension methods for collections.

 IEnumerable<T> mySequence; using (var sequenceEnum = mySequence.GetEnumerator()) { while (sequenceEnum.MoveNext()) { // Do something with sequenceEnum.Current. } } 

A prime example is that you want to iterate over two sequences simultaneously, which is not possible in a foreach .

Answer 3

or even a very classic old fashion method

 for(int i = 0; i < collection.Count(); i++) { string str1 = collection.ElementAt(i); // do your stuff } 

You might also need this method :-)

Answer 4

 foreach (var element in instanceOfAClassThatImplelemntIEnumerable) { }