I am getting error when using following linq query

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string a=list.Where(x => x.GalleyLocation == "G1").Select(x => x.LengthOfArm).ToString();

error:System.Linq.Enumerable+WhereSelectListIterator`2

please need help to know reason for error and also provide the solution for same

Posted 9-Dec-15 22:08pm

Member 12198049

Updated 2-May-21 22:12pm

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OriginalGriff · Answer 1 · 2015-12-09T22:26:00

Your query does not return a single item: it returns an IEnumerable of items which match your condition. So when you take the ToString of the collection, you get the name of the collection - and that's the "message" you get.

Generally speaking, trying to convert any collection into a single string is a poor idea, but you might get what you want this way:

C#

string a=string.Join("", list.Where(x => x.GalleyLocation == "G1").Select(x => x.LengthOfArm.ToString()));

F-ES Sitecore · Answer 2 · 2015-12-09T22:49:00

As already said, Select will return a collection, even if that collection only has a single item in it. If you do the ToString inside the Select then it will return an IEnumerable of string, and you can use FirstOrDefault on that collection to get the first one in the collection.

C#

string a=list.Where(x => x.GalleyLocation == "G1").Select(x => x.LengthOfArm.ToString()).FirstOrDefault();

If the collection is empty you'll get the default value for that type, so it'll return null for strings. If the collection has only one item in it then you get that item, if it has multiple items you get the first one and the rest are ignored.

If you want to ensure there was only one item in the list then you can use SingleOrDefault and that will raise an exception if there was more than one item in the list. This is usually a bad idea though.

Member 15181060 · Answer 3 · 2021-05-02T22:12:00

Solution 3

Thanks a lot!! That was saving me from dispear. Very good explanation, easy when understood.

Posted 2-May-21 22:12pm

Member 15181060

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CHill60 4-May-21 8:29am

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I am getting error when using following linq query

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