ListView的Column排序方法

helloyesyes

ListView的Column排序是很常见的功能。具体实现的时候，主要是下面几步：
1、创建两个类
2、重载ColumnClick方法。

<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 95%; padding-top: 4px;">usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Collections;

namespacetest
...{
publicpartialclassForm1:Form
...{
publicForm1()
...{
InitializeComponent();
}

privatevoidlistView1_ColumnClick(objectsender,ColumnClickEventArgse)
...{
//CreateaninstanceoftheColHeaderclass.
ColHeaderclickedCol=(ColHeader)this.listView1.Columns[e.Column];

//Settheascendingpropertytosortintheoppositeorder.
clickedCol.ascending=!clickedCol.ascending;

//Getthenumberofitemsinthelist.
intnumItems=this.listView1.Items.Count;

//Turnoffdisplaywhiledataisrepoplulated.
this.listView1.BeginUpdate();

//PopulateanArrayListwithaSortWrapperofeachlistitem.
ArrayListSortArray=newArrayList();
for(inti=0;i<numItems;i++)
...{
SortArray.Add(newSortWrapper(this.listView1.Items,e.Column));
}

//SorttheelementsintheArrayListusinganewinstanceoftheSortComparer
//class.Theparametersarethestartingindex,thelengthoftherangetosort,
//andtheIComparerimplementationtouseforcomparingelements.Notethat
//theIComparerimplementation(SortComparer)requiresthesort
//directionforitsconstructor;trueifascending,othwisefalse.
SortArray.Sort(0,SortArray.Count,newSortWrapper.SortComparer(clickedCol.ascending));

//Clearthelist,andrepopulatewiththesorteditems.
this.listView1.Items.Clear();
for(inti=0;i<numItems;i++)
this.listView1.Items.Add(((SortWrapper)SortArray).sortItem);

//Turndisplaybackon.
this.listView1.EndUpdate();

}

privatevoidbutton1_Click(objectsender,EventArgse)
...{
this.listView1.View=View.Details;

//AddcolumnsusingtheColHeaderclass.Thefourth
//parameterspecifiestrueforanascendingsortorder.
listView1.Columns.Add(newColHeader("Name",110,HorizontalAlignment.Left,true));
listView1.Columns.Add(newColHeader("Region",50,HorizontalAlignment.Left,true));
listView1.Columns.Add(newColHeader("Sales",70,HorizontalAlignment.Left,true));

//Addthedata.
listView1.Items.Add(newListViewItem(newstring[]...{"Archer,Karen","4","0521.28"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Benson,Max","8","0828.54"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Bezio,Marin","3","0535.22"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Higa,Sidney","2","0987.50"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Martin,Linda","6","1122.12"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Nash,Mike","7","1030.11"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Sanchez,Ken","1","0958.78"}));
listView1.Items.Add(newListViewItem(newstring[]...{"Smith,Ben","5","0763.25"}));

//ConnecttheListView.ColumnClickeventtotheColumnClickeventhandler.
this.listView1.ColumnClick+=newColumnClickEventHandler(listView1_ColumnClick);


}
}

publicclassColHeader:ColumnHeader
...{
publicboolascending;
publicColHeader(stringtext,intwidth,HorizontalAlignmentalign,boolasc)
...{
this.Text=text;
this.Width=width;
this.TextAlign=align;
this.ascending=asc;
}
}

classSortWrapper
...{
internalListViewItemsortItem;
internalintsortColumn;


//ASortWrapperrequirestheitemandtheindexoftheclickedcolumn.
publicSortWrapper(ListViewItemItem,intiColumn)
...{
sortItem=Item;
sortColumn=iColumn;
}

//Textpropertyforgettingthetextofanitem.
publicstringText
...{
get
...{
returnsortItem.SubItems[sortColumn].Text;
}
}

//ImplementationoftheIComparer
//interfaceforsortingArrayListitems.
publicclassSortComparer:IComparer
...{
boolascending;

//Constructorrequiresthesortorder;
//trueifascending,otherwisedescending.
publicSortComparer(boolasc)
...{
this.ascending=asc;
}

//ImplemnentationoftheIComparer:Compare
//methodforcomparingtwoobjects.
publicintCompare(objectx,objecty)
...{
SortWrapperxItem=(SortWrapper)x;
SortWrapperyItem=(SortWrapper)y;

stringxText=xItem.sortItem.SubItems[xItem.sortColumn].Text;
stringyText=yItem.sortItem.SubItems[yItem.sortColumn].Text;
returnxText.CompareTo(yText)*(this.ascending?1:-1);
}
}

}
}