Convert string[] to int[] in one line of code using LINQ
.net, c#, extension-methods, linq
Solution
Given an array you can use the `Array.ConvertAll` method:
int[] myInts = Array.ConvertAll(arr, s => int.Parse(s));
Thanks to Marc Gravell for pointing out that the lambda can be omitted, yielding a shorter version shown below:
int[] myInts = Array.ConvertAll(arr, int.Parse);
A LINQ solution is similar, except you would need the extra `ToArray` call to get an array:
int[] myInts = arr.Select(int.Parse).ToArray();
Problem
I have an array of integers in string form: ``` var arr = new string[] { "1", "2", "3", "4" }; ``` I need to an array of 'real' integers to push it further: ``` void Foo(int[] arr) { .. } ``` I tried to cast int and it of course failed: ``` Foo(arr.Cast<int>.ToArray()); ``` I can do next: ``` var list = new List<int>(arr.Length); arr.ForEach(i => list.Add(Int32.Parse(i))); // maybe Convert.ToInt32() is better? Foo(list.ToArray()); ``` or ``` var list = new List<int>(arr.Length); arr.ForEach(i => { int j; if (Int32.TryParse(i, out j)) // TryParse is faster, yeah { list.Add(j); } } Foo(list.ToArray()); ``` but both looks ugly. Is there any other ways to complete the task?