c# - How to combine `Select` and `Where` - Stack Overflow?

c# - How to combine `Select` and `Where` - Stack Overflow?

WebMar 11, 2024 · Add a comment. 9. I know this is a relatively old post, but if you wanted to concatenate multiple IEnumerable's, I use the following. var joinedSel = new [] { first, second, third }.Where (x => x != null).SelectMany (x => x); This eliminates any null … WebJun 24, 2024 · 3. The simplest solution I can think of. var interleavingMergedLists = list1 .Zip (list2, (lhs, rhs) => new [] {lhs, rhs}) .SelectMany (l => l) .ToList (); Rather than creating a new anonymous object / ValueTuple instead create an array. Then you can flatten that array with the SelectMany. And finally you can materialize your query with ToList ... coloriage beyblade burst turbo achilles WebOct 7, 2024 · Use List instead. List FileList = GetFilesfromDir (DirName).ToList (); you can now. FileList.AddRange (GetFilesfromDir (dirname)); to concatenate a second list. Marked as answer by Anonymous Thursday, October 7, 2024 12:00 AM. WebIEnumerable にキャストするのではなく、なぜ.AsEnumerable()を使用するのですか? 2つのリストをC#の辞書にマップする. IEnumerableのカウントの計算(非ジェネリック) LINQを使用してIEnumerableの前のアイテムと次のアイテムを取得する coloriage bff a 3 Web2 days ago · It can be done in one step using LINQ's SelectMany method, e.g.: IEnumerable ints = a .SelectMany (e => e switch { int i => new [] { i }, _ => Enumerable.Empty () }); This works because SelectMany allows us to create a new sequence of elements (possible of a different type) for every element of the input … WebSep 23, 2016 · I've been playing around with generators, generics and extension methods in C# (5.0) and wanted to create an extension method for IEnumerable, which would append another IEnumerable to it and allow a limit to be put on the whole thing.. The way this differs from just using Concat() and then Take() is that instead of passing an IEnumerable, you … coloriage beyblade burst spryzen WebNov 6, 2013 · var ages = new[] {22, 58, 36}; var namesAndAges = names.Zip (ages, (name, age) => Tuple.Create (name, age)); This will produce an IEnumerable> that contains three Tuples, with each Tuple holding a name and age. If you want to fill in the gaps in your C# knowledge be sure to check out …

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