How To Sort a List<T>?

2018-06-25 08:12:20

This question already has an answer here:

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

Your example code will not compile, because the ID property of your class needs to be an int instead of a string and you need to put double quotes around your string values, like this:

public class Checkit
{
    public int ID { get; set; }
    public string b { get; set; }
    public string c { get; set; }
}

List<Checkit> Lst_Ch = new List<Checkit>();
Lst_Ch.Add(new Checkit
{
    ID = 123,
    b = "afasfa",
    c = "afagas"
});
Lst_Ch.Add(new Checkit
{
    ID = 124,
    b = "afasfa",
    c = "afagas"
});
Lst_Ch.Add(new Checkit
{
    ID = 523,
    b = "afasfa",
    c = "afagas"
});
Lst_Ch.Add(new Checkit
{
    ID = 123,
    b = "afasfa",
    c = "afagas"
});        
Lst_Ch.Add(new Checkit
{
    ID = 523,
    b = "afasfa",
    c = "afagas"
});
Lst_Ch.Add(new Checkit
{
    ID = 105,
    b = "afasfa",
    c = "afagas"
});

Second, to sort the list, do the following:

IEnumerable<Checkit> query = Lst_Ch.OrderBy(l => l.ID).ToList();

The variable query is now your sorted list, which you can use elsewhere, loop through, etc.

You can

Use Linq to sort it and create a new List<T> . Something like:

List<Foo> unsortedList = CreateAnUnorderedList() ;
List<Foo> sortedList   = unsortedList.OrderBy( x => x.DateCreated )
                                     .ThenBy(  x => x.Id          )
                                     .ToList()
                                     ;

You can sort it in place. Something like:

List<Foo> myList = CreateAnUnorderedList() ;
myList.Sort( (x,y) => x.Id < y.Id ? -1 : x.Id > y.Id ? +1 : 0 ) ;

Alternatively, you can use an ordered collection, like SortedList<T> .

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