Automatic ListView Grouping

Automatic ListView Grouping

Lets say you have lots of data your listview. Now you want to Group This data According to a Perticular Subitems.

For Example:

Suppose i have some books data in my ListView.
this listview items contains Author name and Books Title.

And there are 2000 Books in list view.

Now i want to group the data in listview according to the Authors.

Now lets say there are 50 Unique Authors , meaning we will have to create 50 Groups in listview.

this seem hectic, and i dont know if there is any inbuilt function to automatically group this items, but i have created mine To automatically do the above.

Hope it becomes usefull to someone.

Code:

public void GroupListView(ListView lstV, int SubItemIndex)
 {
 bool flag = true;

 foreach (ListViewItem l in lstV.Items)
 {
 string strmyGroupname = l.SubItems[SubItemIndex].Text;

 foreach (ListViewGroup lvg in lstV.Groups)
 {
 if (lvg.Name == strmyGroupname)
 {
 l.Group = lvg;
 flag = false;
 }
 }

 if (flag == true)
 {
 ListViewGroup lstGrp = new ListViewGroup(strmyGroupname, strmyGroupname);
 lstV.Groups.Add(lstGrp);
 l.Group = lstGrp;
 }

 flag = true;


 }
 }

How To Use The Code:

Lets say the authors sub items index is 1 and listview name is LstBooks

then call the function like:

GroupListView(LstBooks,1);

Vb.net Version:

Public Sub GroupListView(ByVal lstV As ListView, ByVal SubItemIndex As Int16)
 Dim flag As Boolean = True
 For Each l As ListViewItem In lstV.Items

 Dim strmyGroupname As String = l.SubItems(SubItemIndex).Text

 For Each lvg As ListViewGroup In lstV.Groups

 If lvg.Name = strmyGroupname Then
 l.Group = lvg
 flag = False
 End If

 Next

 If flag = True Then
 Dim lstGrp As New ListViewGroup(strmyGroupname, strmyGroupname)
 lstV.Groups.Add(lstGrp)
 l.Group = lstGrp
 End If

 flag = True

 Next
 End Sub

Output:

go to link download