Method for sorting a list in C#

This question already has an answer here:

How to Sort a List<T> by a property in the object 19 answers

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It's definitely not something you should do manually (unless you're training your algorithmics skills :) ). It will make your code more complex and harder to maintain.

Just put:

using System.Linq;

and do this:

var sorted = list.OrderByDescending(x => x.PersonalNumber).ToList();

you don't need to be Linq ninja to use it. I also strongly recommend to start using it. I think you can agree it's very easy to read and quite obvious what is it doing.

Ah, and if you're wanting to sort ascending, just use .OrderBy instead of .OrderByDescending.

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If you want to sort list in place, just put Sort :

list.Sort((x, y) => x.PersonalNumber.CompareTo(y.PersonalNumber));

To sort in descending order, add - :

list.Sort((x, y) => -x.PersonalNumber.CompareTo(y.PersonalNumber));

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For most scenarios, you should use one of the built-in functionalities for sorting, such as List<T>.Sort or Enumerable.OrderBy . I'm assuming that you want to retain your own implementation for the sorting algorithm.

You can introduce a key selector function as the second argument to your method:

public static void SelectionSort<TSource, TKey>(
    List<TSource> list, 
    Func<TSource, TKey> keySelector) 
{
    // With this method the list is sorted in ascending order. 
    //posMin is short for position of min
    int posMin;
    for (int i = 0; i < list.Count - 1; i++) {
        posMin = i;//Set posMin to the current index of array
        for (int j = i + 1; j < list.Count; j++) {
            if (keySelector(list[j]) < keySelector(list[posMin])) {
                //posMin will keep track of the index that min is in, this is needed when a swap happens
                posMin = j;
            }
        }

        //if pos_min no longer equals i than a smaller value must have been found, so a swap must occur
        TSource temp;
        if (posMin != i) {
            temp = list[i];
            list[i] = list[posMin];
            list[posMin] = temp;
        }
    }
}

You would then consume this with a lambda expression:

SelectionSort(persons, (Person p) => p.PersonalNumber);

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