How to get all elements of a list that match the?
Return value: This method returns a List containing all the elements that match the conditions defined by the specified predicate otherwise it returns an empty List . Exception: This method will give ArgumentNullException if the match is null.
How to join two lists based on common property?
If one list does not contain an object with an Id that is present in the other list, the value should be null: How can I achieve that? Update: I know how I could get such a list, of course, but I’m looking for the most performant way to do it, preferrably by using some witty Linq magic.
Do you need null values to join two lists?
Don’t really see why you would want null values returned, unless you absolutely need to (Besides, double is not-nullable, so it would have to be the resulting combined entry that would be null instead). The requirement is slightly unclear. Do you want a Cartesian product or a join on Id? If the latter, then this should work:
How to select object with minimum or maximum property?
Perfectly simple use of aggregate (equivalent to fold in other languages): The only downside is that the property is accessed twice per sequence element, which might be expensive. That’s hard to fix. .NET 6 Preview 4 supports MaxBy/MinBy natively. So you will be able to do this with a simple The following is the more generic solution.
How to select only match in Stack Overflow?
If you want to ensure you have only match you can use single. Single Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. It is very simple. Please have a look at this. Thanks for contributing an answer to Stack Overflow!
How to select only match in LINQ stack?
You can use Enumerable.Where and it will return all the matching elements collection. If you want to ensure you have only match you can use single. Single Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. It is very simple.
How to get indexes of all matching items?
You only can improve readability by splitting your query into couple lines: public static IEnumerable IndexesWhere (this IEnumerable source, Func predicate) { int index=0; foreach (T element in source) { if (predicate (element)) { yield return index; } index++; } } Not the answer you’re looking for?