ComboBoxExtension.BindToEF(Type, String, EventHandler<LinqServerModeDataSourceSelectEventArgs>) Method

Binds the combo box to a data source using the Entity Framework in database server mode.

Namespace: DevExpress.Web.Mvc

Assembly: DevExpress.Web.Mvc5.v24.2.dll

Declaration

C#

public ComboBoxExtension BindToEF(
    Type contextType,
    string tableName,
    EventHandler<LinqServerModeDataSourceSelectEventArgs> selectingMethod
)

VB.NET

Public Function BindToEF(
    contextType As Type,
    tableName As String,
    selectingMethod As EventHandler(Of LinqServerModeDataSourceSelectEventArgs)
) As ComboBoxExtension

Parameters

Name	Type	Description
contextType	Type	A Type specifying the DataContext type.
tableName	String	A String object specifying the table name.
selectingMethod	EventHandler<LinqServerModeDataSourceSelectEventArgs>	A method to which selection logic is delegated.

Returns

Type	Description
ComboBoxExtension	A ComboBoxExtension object representing the combo box extension.

Remarks

Use the BindToEF method to bind the combo box to Entity Framework data models.

Internally, the BindToEF method uses our EntityServerModeDataSource component, which was specifically designed to allow the combo box to efficiently process large amounts of data. The EntityServerModeDataSource component automatically enables database server mode to optimize the execution of all queries to the data context initiated by the combo box. In this mode, the combo box loads records on demand and performs data-aware operations on the data server. This technique significantly improves the combo box’s speed and responsiveness.

Note

The current BindToEF overload catches and conceals any exception thrown by an EF data provider. To catch these exceptions manually, use the BindToEF(string contextTypeName, string tableName, EventHandler<LinqServerModeDataSourceSelectEventArgs> selectingMethod, EventHandler<ServerModeExceptionThrownEventArgs> exceptionThrownMethod) overload method.

Online Demo

Combo Box Binding (Server Mode)