Binding to BindingList

Updated over 6 months ago

BindingList is a generic list type, that provides additional control over list items, i.e. the items in RadChartView can be easily edited, removed or added. BindingList also surfaces events that notify when the list has been changed. The example below creates a list of MyCustomObject, initializes the list and assigns it to the BarSeries object in RadChartView.

C#

BindingList<MyCustomObject> myList;
protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    myList = new BindingList<MyCustomObject>();
    myList = new BindingList<MyCustomObject>();
    myList.Add(new MyCustomObject(1, "Outdoor"));
    myList.Add(new MyCustomObject(8, "Hardware"));
    myList.Add(new MyCustomObject(3, "Tools"));
    myList.Add(new MyCustomObject(6, "Books"));
    myList.Add(new MyCustomObject(2, "Appliances"));
    BarSeries barSeria = new BarSeries();
    radChartView1.Series.Add(barSeria);
    barSeria.DataSource = myList;
    barSeria.ValueMember = "MyInt";
    barSeria.CategoryMember = "MyString";
}

VB.NET

Private myList As BindingList(Of MyCustomObject)
Public Sub New()
    InitializeComponent()
    myList = New BindingList(Of MyCustomObject)()
    myList = New BindingList(Of MyCustomObject)()
    myList.Add(New MyCustomObject(1, "Outdoor"))
    myList.Add(New MyCustomObject(8, "Hardware"))
    myList.Add(New MyCustomObject(3, "Tools"))
    myList.Add(New MyCustomObject(6, "Books"))
    myList.Add(New MyCustomObject(2, "Appliances"))
    Dim barSeria As New BarSeries()
    RadChartView1.Series.Add(barSeria)
    barSeria.DataSource = myList
    barSeria.ValueMember = "MyInt"
    barSeria.CategoryMember = "MyString"
End Sub

Figure 1: Binding to BindingList

In order to allow RadChartView to automatically reflect changes in the data source, your object should implement the INotifyPropertyChanged interface:

Binding to BindingList

C#

public class MyCustomObject : INotifyPropertyChanged
{
    private int _myInt;
    private string _myString;
    public MyCustomObject(int myInt, string myString)
    {
        _myInt = myInt;
        _myString = myString;
    }
    public int MyInt
    {
        get { return _myInt; }
        set
        {
            _myInt = value;
            OnPropertyChanged("MyInt");
        }
    }
    public string MyString
    {
        get { return _myString; }
        set
        {
            _myString = value;
            OnPropertyChanged("MyString");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

VB.NET

Public Class MyCustomObject
    Implements INotifyPropertyChanged
    Private _myInt As Integer
    Private _myString As String
    Public Sub New(myInt As Integer, myString As String)
        _myInt = myInt
        _myString = myString
    End Sub
    Public Property MyInt() As Integer
        Get
            Return _myInt
        End Get
        Set(value As Integer)
            _myInt = value
            OnPropertyChanged("MyInt")
        End Set
    End Property
    Public Property MyString() As String
        Get
            Return _myString
        End Get
        Set(value As String)
            _myString = value
            OnPropertyChanged("MyString")
        End Set
    End Property
    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
    Protected Overridable Sub OnPropertyChanged(propertyName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
    End Sub
End Class

Once the interface is implemented and your collection implement IBindingList, just like the BindingList does, changes are automatically reflected. Here is a sample of adding a new record:

Add Item

C#

private void radButton1_Click(object sender, EventArgs e)
{
    myList.Add(new MyCustomObject(10, "Plants"));
}

VB.NET

Private Sub RadButton1_Click(sender As System.Object, e As System.EventArgs) Handles RadButton1.Click
    myList.Add(New MyCustomObject(10, "Plants"))
End Sub

Figure 2: Reflect Object Changes

See Also

• Getting Started
• Binding to DataTable