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ListView Sorter

, 22 May 2003 150.3K 1.1K 33
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Custom ListViewItemSorter with pluggable cell comparators
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Introduction

My solution is an alternative to C# Sorted ListView, posted by Carlos H.Perez. The main difference is that I'm not trying to extend ListView control at all. Instead of that I suggest using a standard ListView with customizable ListViewSorter.

The main idea is to tie ListView column headers with appropriate delegates, which can handle column cells comparison activities. So I declare ListViewSorter.Comparer delegate, and enable to store column-delegate pairs into sorter.

//column cell comparer
public delegate int Comparer(string x, string y);
//comparer for column
public Comparer this[ColumnHeader _column] {...}

The sorter itself is tied to a list control and handles the ColumnClick events for that list. On each column the click sorter activates the clicked column.

//click handler
protected void Column_Click(object sender, ColumnClickEventArgs e)
{
    //get and verify clicked list
    ListView _list = sender as ListView;
    if (_list != this.list) 
       throw new Exception("The event sender does not match the list");

    //sweap columns, which are no longer contained by the list
    CleanUp();

    //get clicked column header
    ColumnHeader _column = this.list.Columns[e.Column];

    //activate sort by that header
    SortBy(_column, this.column ! =_column || 
                    this.list.Sorting!=SortOrder.Ascending);
}

That active column later is used by sorting logic to choose correct comparer and to compare cells.

//activates sort by column
public void SortBy(ColumnHeader _column, bool asc)
{
    //validate column
    if (this.list == null) throw new Exception("The list is null");
    if (_column == null) throw new Exception("The column is null");

    //leav old sort if column is not sortable
    if (this[_column] == null) return;

    //activate column
    this.column = _column;

    //activate sort
    this.list.Sorting = SortOrder.None;
    this.list.Sorting = asc ? SortOrder.Ascending : SortOrder.Descending;
}

Bellow is cell comparison through the Comparer implementation.

//cell comparison
int IComparer.Compare(object x, object y)
{
    //validate list
    if (this.list == null || this.list.Sorting == SortOrder.None 
      || this.column == null) return 0;

    //get cells
    ListViewItem ix = x as ListViewItem;
    ListViewItem iy = y as ListViewItem;
    if (ix.ListView != this.list || iy.ListView != this.list)
        throw new Exception("The event sender does not match the list");

    //compare - use column comparer
    return
        (this.list.Sorting==SortOrder.Ascending ? 1:-1) *
        this[this.column](ix.SubItems[this.column.Index].Text, 
                          iy.SubItems[this.column.Index].Text);
}

ListViewSorter already has standard comparers (as static methods) for strings, numbers, dates.

History

  • 23 May 2003 - updated download

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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gz
Lithuania Lithuania
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Comments and Discussions

 
NewsBug and fix Pin
dEUs[CPP]25-Apr-06 3:00
memberdEUs[CPP]25-Apr-06 3:00 
GeneralRe: Bug and fix Pin
Mustafa Sait Ozen13-Jul-06 11:27
memberMustafa Sait Ozen13-Jul-06 11:27 
GeneralRe: Bug and fix Pin
Scott S.7-Aug-07 10:36
memberScott S.7-Aug-07 10:36 
GeneralSimilar Approach, But With An Example Pin
FOOS29-Mar-05 12:08
memberFOOS29-Mar-05 12:08 
GeneralProblem with sorting Pin
robdogg13-May-04 8:25
memberrobdogg13-May-04 8:25 
GeneralFrom MSDN Pin
mgvinod12-Jun-03 23:28
membermgvinod12-Jun-03 23:28 
GeneralSorting CheckBoxes Pin
Shardool3-Jun-03 11:14
memberShardool3-Jun-03 11:14 
GeneralListViewSorter Pin
Russell Mangel2-Jan-03 22:35
memberRussell Mangel2-Jan-03 22:35 
GeneralRe: ListViewSorter Pin
demerson14-Mar-05 13:38
memberdemerson14-Mar-05 13:38 
GeneralRe: ListViewSorter Pin
kwirq8-May-06 10:45
memberkwirq8-May-06 10:45 
QuestionListView sorting Mutex? Pin
timothy_M_Miller2-Oct-02 1:43
membertimothy_M_Miller2-Oct-02 1:43 
AnswerRe: ListView sorting Mutex? Pin
Russell Mangel2-Jan-03 22:38
memberRussell Mangel2-Jan-03 22:38 
GeneralRe: ListView sorting Mutex? Pin
timothy_M_Miller7-Jan-03 2:57
membertimothy_M_Miller7-Jan-03 2:57 
GeneralRe: ListView sorting Mutex? Pin
Anonymous11-Jan-03 3:39
sussAnonymous11-Jan-03 3:39 
GeneralRe: ListView sorting Mutex? Pin
timothy_M_Miller22-Jan-03 1:22
membertimothy_M_Miller22-Jan-03 1:22 
GeneralRe: ListView sorting Mutex? Pin
ChristianD20-Jan-03 8:20
memberChristianD20-Jan-03 8:20 
GeneralRe: ListView sorting Mutex? Pin
timothy_M_Miller22-Jan-03 1:35
membertimothy_M_Miller22-Jan-03 1:35 
GeneralRe: ListView sorting Mutex? Pin
ChristianD22-Jan-03 6:15
memberChristianD22-Jan-03 6:15 
GeneralRe: ListView sorting Mutex? Pin
demerson15-Mar-05 8:09
memberdemerson15-Mar-05 8:09 

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