Sorting a drop down list

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Sorting a drop down list

This code shows how to sort a Drop Down List. This code was added to a Drop Down List custom control.

using System.Collections;

public void SortByValue()
{
SortCombo(this, new ComboValueComparer());
}

public void SortByText()
{
SortCombo(this, new ComboTextComparer());
}

private static void SortCombo(ListControl combo, IComparer comparer)
{
int i;

if (combo.Items.Count <= 1)
return;

ArrayList arrItems=new ArrayList();

for (i=0; i {
ListItem item=combo.Items[i];
arrItems.Add(item);
}
arrItems.Sort(comparer);
combo.Items.Clear();

for (i=0; i {
combo.Items.Add((ListItem) arrItems[i]);
}
}

/// compare list items by their value
///
private class ComboValueComparer : IComparer
{
public enum SortOrder
{
Ascending=1,
Descending=-1
}

private int _modifier;

public ComboValueComparer()
{

_modifier = (int) SortOrder.Ascending;

}

public ComboValueComparer(SortOrder order)
{
_modifier = (int) order;
}

//sort by value
public int Compare(Object o1, Object o2)
{
ListItem cb1=(ListItem) o1;
ListItem cb2=(ListItem) o2;
return cb1.Value.CompareTo(cb2.Value)*_modifier;
}
} //end class ComboValueComparer

///

/// compare list items by their text.
///

private class ComboTextComparer : IComparer
{
public enum SortOrder
{
Ascending=1,
Descending=-1
}

private int _modifier;

public ComboTextComparer()
{
_modifier = (int) SortOrder.Ascending;
}

public ComboTextComparer(SortOrder order)
{
_modifier = (int) order;
}

//sort by value
public int Compare(Object o1, Object o2)
{
ListItem cb1=(ListItem) o1;
ListItem cb2=(ListItem) o2;

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