ComboBoxExtension.BindToEF(String, String, EventHandler<LinqServerModeDataSourceSelectEventArgs>, EventHandler<ServerModeExceptionThrownEventArgs>) 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.v24.1.dll

NuGet Package: DevExpress.Web.Mvc5

Declaration

C#

public ComboBoxExtension BindToEF(
    string contextTypeName,
    string tableName,
    EventHandler<LinqServerModeDataSourceSelectEventArgs> selectingMethod,
    EventHandler<ServerModeExceptionThrownEventArgs> exceptionThrownMethod
)

VB.NET

Public Function BindToEF(
    contextTypeName As String,
    tableName As String,
    selectingMethod As EventHandler(Of LinqServerModeDataSourceSelectEventArgs),
    exceptionThrownMethod As EventHandler(Of ServerModeExceptionThrownEventArgs)
) As ComboBoxExtension

Parameters

Name	Type	Description
contextTypeName	String	A String object representing the DataContext type name.
tableName	String	A String object specifying the table name.
selectingMethod	EventHandler<LinqServerModeDataSourceSelectEventArgs>	A method to which selection logic is delegated.
exceptionThrownMethod	EventHandler<ServerModeExceptionThrownEventArgs>	A delegate method that allows you to catch unhandled/CLR exceptions.

Returns

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

Remarks

Using the BindToEF method, you can easily 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)