How to get the first element of IEnumerable

user_257670 0
Viewed 27634

Is there a better way getting the first element of IEnumerable type of this:

foreach (Image image in imgList)
{
     picture.Width = (short)image.Columns;
     picture.Height = (short)image.Rows;
     break;
}

This is the exact declaration of the type:

public class ImageList : IEnumerable, IDisposable
html-lists ienumerable linq-to-objects .net c#
5 Answers
var firstImage = imgList.Cast<Image>().First();
user_1260140

If you can't use LINQ you could also get the enumerator directly by imgList.GetEnumerator() And then do a .MoveNext() to move to the first element. .Current will then give you the first element.

user_167520

The extension .First() will grab the first item in an enumerable. If the collection is empty, it will throw an exception. .FirstOrDefault() will return a default value for an empty collection (null for reference types). Choose your weapon wisely!

Jarrett_Meyer_58340

Might be slightly irrelevant to your current situation, but there is also a .Single() and a .SingleOrDefault() which returns the first element and throws an exception if there isn't exactly one element in the collection (.Single()) or if there are more than one element in the collection (.SingleOrDefault()).

These can be very useful if you have logic that depends on only having a single (or zero) objects in your list. Although I suspect they are not what you wanted here.

user_2717460
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