Data binding

Binding the WinComboBox control to a data source will automatically populate it with items. In order to bind the combobox to a data source, the DataSource and (optionally) DataMember properties must be set.

The following table provides a listing of the supported data sources:

Data Source	Description
DataTable	Represents one table of in-memory data.
DataView	Represents a databindable, customized view of a DataTable for sorting, filtering, searching, editing, and navigation.
DataSet	Represents an in-memory cache of data.
DataViewManager	Contains a default DataViewSettingCollection for each DataTable in a DataSet.
Any component that implements the IListSource interface	Provides functionality to an object to return a list that can be bound to a data source.
Any component that implements the IList interface	Represents a collection of objects that can be individually accessed by index
Jagged arrays	An array whose elements are arrays.

The first example demonstrates how to bind the WinComboBox control to a DataSet and assumes that a dataset was created using the OleDbDataAdapter class.

VB.NET	Copy Code
Dim combo As New WinComboBox() oleDbDataAdapter1.Fill( dataSet11 ) combo.DataSource = dataSet11 combo.DataMember = "Orders" combo.Location = New Point( 10 , 10 ) Me.Controls.Add( combo )

C#	Copy Code
WinComboBox combo = new WinComboBox(); oleDbDataAdapter1.Fill( dataSet11 ); combo.DataSource = dataSet11; combo.DataMember = "Orders"; combo.Location = new Point( 10 , 10 ); this.Controls.Add( combo );

Copy Code

WinComboBox combo = new WinComboBox();    

oleDbDataAdapter1.Fill( dataSet11 );     

combo.DataSource = dataSet11;

combo.DataMember = "Orders";          

combo.Location = new Point( 10 , 10 );

this.Controls.Add( combo   );

The next example demonstrates how to bind the WinComboBox control to a Jagged array. If items are added, removed, or modified in the jagged array from outside of the combobox, then the jagged array must be reassigned to the DataSource property in order for the modifications to be reflected in the combobox.

VB.NET	Copy Code
Dim combo As New WinComboBox() Dim data(9)() As Object data(0) = New Object(3) {"Canada", 31500000, "Ottawa", "12.2 ºc"} data(1) = New Object(3) {"Switzerland", 7300000, "Bern", "23.3 ºc"} data(2) = New Object(3) {"France", 59500000, "Paris", "27.3 ºc"} data(3) = New Object(3) {"USA", 278000000, "Washington", "14.1 ºc"} data(4) = New Object(3) {"UK", 59700000, "London", "23.7 ºc"} data(5) = New Object(3) {"Belgium", 10300000, "Brussels", "21.8 ºc"} data(6) = New Object(3) {"Italy", 57700000, "Rome", "29.6 ºc"} data(7) = New Object(3) {"Spain", 40000000, "Madrid", "31.8 ºc"} data(8) = New Object(3) {"Germany", 83000000, "Berlin", "25.1 ºc"} data(9) = New Object(3) {"Japan", 126800000, "Tokyo", "17.2 ºc"} combo.DataSource = data combo.Location = New Point( 10 ,10 ) Me.Controls.Add( combo )

VB.NET

Copy Code

Dim combo As New WinComboBox()

Dim data(9)() As Object

data(0) = New Object(3) {"Canada", 31500000, "Ottawa", "12.2 ºc"}

data(1) = New Object(3) {"Switzerland", 7300000, "Bern", "23.3 ºc"}

data(2) = New Object(3) {"France", 59500000, "Paris", "27.3 ºc"}

data(3) = New Object(3) {"USA", 278000000, "Washington", "14.1 ºc"}

data(4) = New Object(3) {"UK", 59700000, "London", "23.7 ºc"}

data(5) = New Object(3) {"Belgium", 10300000, "Brussels", "21.8 ºc"}

data(6) = New Object(3) {"Italy", 57700000, "Rome", "29.6 ºc"}

data(7) = New Object(3) {"Spain", 40000000, "Madrid", "31.8 ºc"}

data(8) = New Object(3) {"Germany", 83000000, "Berlin", "25.1 ºc"}

data(9) = New Object(3) {"Japan", 126800000, "Tokyo", "17.2 ºc"}    

combo.DataSource = data     

combo.Location = New Point( 10 ,10 )

Me.Controls.Add( combo )

C#	Copy Code
WinComboBox combo = new WinComboBox(); object[][] data = new object[ 10 ][] { new object[ 4 ] { "Canada" , 31500000 , "Ottawa" , "12.2 ºc" }, new object[ 4 ] { "Switzerland" , 7300000, "Bern" , "23.3 ºc"}, new object[ 4 ] { "France" , 59500000 , "Paris" , "27.3 ºc" } , new object[ 4 ] { "USA" , 278000000 , "Washington" , "14.1 ºc" } , new object[ 4 ] { "UK" , 59700000, "London" , "23.7 ºc" } , new object[ 4 ] { "Belgium" , 10300000, "Brussels" , "21.8 ºc" } , new object[ 4 ] { "Italy" , 57700000 , "Rome" , "29.6 ºc"} , new object[ 4 ] { "Spain" , 40000000 , "Madrid" , "31.8 ºc" } , new object[ 4 ] { "Germany" , 83000000, "Berlin" , "25.1 ºc" } , new object[ 4 ] { "Japan" , 126800000, "Tokyo" , "17.2 ºc" } }; combo.DataSource = data; combo.Location = new Point( 10, 10 ); this.Controls.Add( combo );

Copy Code

WinComboBox combo = new WinComboBox();

object[][] data = new object[ 10 ][] {

           new object[ 4 ] { "Canada" , 31500000 , "Ottawa" , "12.2 ºc" },

           new object[ 4 ] { "Switzerland" , 7300000, "Bern"  , "23.3 ºc"},

           new object[ 4 ] { "France" , 59500000 , "Paris" , "27.3 ºc" } ,

           new object[ 4 ] { "USA" , 278000000 , "Washington" , "14.1 ºc" } ,

           new object[ 4 ] { "UK" , 59700000, "London" , "23.7 ºc" } ,

           new object[ 4 ] { "Belgium" , 10300000, "Brussels" , "21.8 ºc" } ,

           new object[ 4 ] { "Italy" , 57700000 , "Rome" , "29.6 ºc"} ,

           new object[ 4 ] { "Spain" , 40000000 , "Madrid" , "31.8 ºc" } ,

           new object[ 4 ] { "Germany" , 83000000, "Berlin" , "25.1 ºc" } ,

new object[ 4 ] { "Japan" , 126800000, "Tokyo" , "17.2 ºc" } };

combo.DataSource = data;

combo.Location = new Point( 10, 10 );

this.Controls.Add( combo );

In the case where the WinComboBox control is created using the constructor that accepts a DisplayFormat, only the columns specified by the DisplayFormat and ValueMember parameters will be created in the DropDownControl.