Binding to BindingList
BindingList is a generic list type that has additional binding support. While you can bind to a generic list, BindingList provides additional control over list items, i.e. if they can be edited, removed or added. BindingList also surfaces events that notify when the list has been changed. The example below creates a list of MyObject, initializes the list and assigns the list to the grid DataSource property. The example also uses a ListChangedEventHandler that reports the type of change that occurred, the new index of the item and the content of the item.
public class MyObject
{
public MyObject()
{
}
public MyObject(int myInt, string myString)
{
_myInt = myInt;
_myString = myString;
}
private int _myInt;
public int MyInt
{
get { return _myInt; }
set { _myInt = value; }
}
private string _myString;
public string MyString
{
get { return _myString; }
set { _myString = value; }
}
}
Public Class MyObject
Public Sub New()
End Sub
Public Sub New(ByVal myInt As Integer, ByVal myString As String)
_myInt = myInt
_myString = myString
End Sub
Private _myInt As Integer
Public Property MyInt() As Integer
Get
Return _myInt
End Get
Set(ByVal value As Integer)
_myInt = value
End Set
End Property
Private _myString As String
Public Property MyString() As String
Get
Return _myString
End Get
Set(ByVal value As String)
_myString = value
End Set
End Property
End Class
private BindingList<MyObject> myList;
private void Form1_Load(object sender, EventArgs e)
{
myList = new BindingList<MyObject>();
myList.Add(new MyObject(1, "Outdoor"));
myList.Add(new MyObject(2, "Hardware"));
myList.Add(new MyObject(3, "Tools"));
myList.Add(new MyObject(4, "Books"));
myList.Add(new MyObject(5, "Appliances"));
myList.RaiseListChangedEvents = true;
myList.ListChanged += new ListChangedEventHandler(myList_ListChanged);
radGridView1.DataSource = myList;
}
void myList_ListChanged(object sender, ListChangedEventArgs e)
{
MessageBox.Show(e.ListChangedType.ToString() + ": at index: " + e.NewIndex.ToString() + ", \"" + myList[e.NewIndex].MyString + "\"");
}
private void radButton1_Click(object sender, EventArgs e)
{
myList.Add(new MyObject(6, "Plants"));
}
Private myList As BindingList(Of MyObject)
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
myList = New BindingList(Of MyObject)()
myList.Add(New MyObject(1, "Outdoor"))
myList.Add(New MyObject(2, "Hardware"))
myList.Add(New MyObject(3, "Tools"))
myList.Add(New MyObject(4, "Books"))
myList.Add(New MyObject(5, "Appliances"))
myList.RaiseListChangedEvents = True
AddHandler myList.ListChanged, AddressOf myList_ListChanged
RadGridView1.DataSource = myList
End Sub
Sub myList_ListChanged(ByVal sender As Object, ByVal e As ListChangedEventArgs)
MessageBox.Show(e.ListChangedType.ToString() + ": at index: " + e.NewIndex.ToString() + ", """ + myList(e.NewIndex).MyString + """")
End Sub
Private Sub RadButton1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click
myList.Add(New MyObject(6, "Plants"))
End Sub