Using IComparer for fast sorting on listbox

ListCollectionView allows to sort listbox in wpf to sort. You bind the listbox to the instance of ListCollectionView.

View.SortDescriptions.Add(new SortDescription(){ PropertyName = columnName,ListSortDirection.Descending});

The above technique uses reflection to sort the ListCollectionView so if you have a large data collection , this can be very slow.

For faster sorting you can use CustomSort.

var sortComparer = new UserComparer ();
View.CustomSort = sortComparer;

Classes
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public abstract class SortComparer : IComparer
{
public string SortColumn;

public ListSortDirection Direction;

public abstract int Compare(object x, object y);

}

public class UserComparer : SortComparer

{

public override int Compare(object x, object y)

{

var tx = (User)x;

var ty = (User)y;

int ret = 0;

switch (SortColumn)

{

case "UserName":

{

ret = Direction == ListSortDirection.Ascending ? tx.UserName.CompareTo(ty.UserName) : ty.UserName.CompareTo(tx.UserName);

break;

}

}

return ret;

}

}