wpf,sorting,listbox,compare,collectionview , WPF Listbox Collection custom sort

WPF Listbox Collection custom sort


Tag: wpf,sorting,listbox,compare,collectionview

I have a listbox


I want to sort it like this


I mean, if there's an item that starts with the sequence "price", it gets priority, else the smallest string should get the priority.

My source code:

var lcv = (ListCollectionView)(CollectionViewSource.GetDefaultView(_itemsSource));
var customSort = new PrioritySorting("price");
lcv.CustomSort = customSort;

internal class PrioritySorting : IComparer
        private string _text;
        public PrioritySorting(string text)
            _text = text;

        public int Compare(object x, object y)
           //my sorting code here


How can i write compare method. I know, that it can return 1,0 or -1. How can i set priorities.


You just have to check if it starts with "price".

Note that I don't think that ToString() is appropriate; you should rather implement IComparer<T> and strongly type your objects in your listbox.

public int Compare(object x, object y)
    // test for equality
    if (x.ToString() == y.ToString())
        return 0;

    // if x is "price" but not y, x goes above
    if (x.ToString().StartsWith("Price") && !y.ToString().StartsWith("Price"))
        return -1;

    // if y is "price" but not x, y goes above
    if (!x.ToString().StartsWith("Price") && y.ToString().StartsWith("Price"))
        return 1;

    // otherwise, compare normally (this way PriceXXX are also compared among themselves)
    return string.Compare(x.ToString(), y.ToString());


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