57
votes
12
answers
1.9K
views
What is the difference between IQueryable<T> and IEnumerable<T>?
What is the difference between IQueryable<T> and IEnumerable<T>? See also What's the differe
55
votes
6
answers
2K
views
LINQ .Any VS .Exists - What's the difference?
Using LINQ on collections, what is the difference between the following lines of code? if(!coll.Any(i => i
56
votes
4
answers
2.2K
views
LINQ Orderby Descending Query
I'm sure this will be a relatively simple one. I have a LINQ query that I want to order by the most rece
59
votes
10
answers
1.9K
views
Join/Where with LINQ and Lambda
I'm having trouble with a query written in LINQ and Lambda. So far, I'm getting a lot of errors here
60
votes
19
answers
2K
views
How to use LINQ to select object with minimum or maximum property value
I have a Person object with a Nullable DateOfBirth property. Is there a way to use LINQ to query a list of Pe
51
votes
16
answers
2.1K
views
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
Consider the IEnumerable extension methods SingleOrDefault() and FirstOrDefault() MSDN documents that SingleO
60
votes
22
answers
990
views
Retrieving Property name from lambda expression
Is there a better way to get the Property name when passed in via a lambda expression? Here is what i currentl
55
votes
16
answers
1.4K
views
Is it better to call ToList() or ToArray() in LINQ queries?
I often run into the case where I want to eval a query right where I declare it. This is usually because I nee
57
votes
16
answers
2.6K
views
Update all objects in a collection using LINQ
Is there a way to do the following using LINQ? foreach (var c in collection) { c.PropertyToSet = value; }
55
votes
23
answers
1K
views
LEFT OUTER JOIN in LINQ
How to perform left outer join in C# LINQ to objects without using join-on-equals-into clauses? Is there any w
58
votes
12
answers
2.9K
views
Concat all strings inside a List<string> using LINQ
Is there any easy LINQ expression to concatenate my entire List<string> collection items to a single str
61
votes
10
answers
2.8K
views
Use LINQ to get items in one List<>, that are not in another List<>
I would assume there's a simple LINQ query to do this, I'm just not exactly sure how. Given this pi
49
votes
10
answers
1.2K
views
Which method performs better: .Any() vs .Count() > 0?
in the System.Linq namespace, we can now extend our IEnumerable's to have the Any() and Count() extension
60
votes
20
answers
3.1K
views
Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T>
I found an example in the VS2008 Examples for Dynamic LINQ that allows you to use a sql-like string (e.g. Orde
58
votes
14
answers
532
views
Using LINQ to remove elements from a List<T>
Say that I have LINQ query such as: var authors = from x in authorsList where x.firstname == "B
57
votes
10
answers
987
views
IEnumerable vs List - What to Use? How do they work?
I have some doubts over how Enumerators work, and LINQ. Consider these two simple selects: List<Animal>
58
votes
12
answers
834
views
LINQ Aggregate algorithm explained
This might sound lame, but I have not been able to find a really good explanation of Aggregate. Good means s
60
votes
22
answers
2.8K
views
LINQ equivalent of foreach for IEnumerable<T>
I'd like to do the equivalent of the following in LINQ, but I can't figure out how: IEnumerable<
60
votes
14
answers
3K
views
When to use .First and when to use .FirstOrDefault with LINQ?
I've searched around and haven't really found a clear answer as to when you'd want to use .Firs
53
votes
14
answers
903
views
Group By Multiple Columns
How can I do GroupBy multiple columns in LINQ Something similar to this in SQL: SELECT * FROM <TableName>
