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.v24.1.dll
NuGet Package: DevExpress.Web.Mvc5
Declaration
public ComboBoxExtension BindToEF(
Type contextType,
string tableName,
EventHandler<LinqServerModeDataSourceSelectEventArgs> selectingMethod
)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)