Question

i have the following problem
I have a list with strings for example (100_1, 100_2 …. , 100_10)

I sort the list with following code

extraImgsRaw.Sort((photo1, photo2) => photo1.CompareTo(photo2));

the result of this is : 100_1, 100_10, 100_2, 100_3 and so on

the result that I want is a logical compare like 100_1, 100_2 and then 100_10 so I prefer a
Natural numeric sort not a Alphabetic sort.
Do I need to write my own compare class that implements the ICompare interface or there is a build method in LINQ that does that?

thank you in advance

Answer 1

There’s nothing built-in, but if the data is exactly as shown in your question then it shouldn’t be too difficult to knock up a Comparison<T> to do this for you:

extraImgsRaw.Sort((x, y) =>
                  {
                      // error checking etc removed for brevity
                      int[] xi = x.Split('_').Select(int.Parse).ToArray();
                      int[] yi = y.Split('_').Select(int.Parse).ToArray();

                      int c = xi[0].CompareTo(yi[0]);
                      return (c != 0) ? c : xi[1].CompareTo(yi[1]);
                  });