GridViewExtension.BindToEF(String, String, EventHandler<LinqServerModeDataSourceSelectEventArgs>, EventHandler<ServerModeExceptionThrownEventArgs>) Method

Binds the GridView to a data source via the Entity Framework in database server mode.

Namespace: DevExpress.Web.Mvc

Assembly: DevExpress.Web.Mvc5.v19.2.dll

Declaration

C#

public GridViewExtension 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 GridViewExtension

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 catching unhandled/CLR exceptions that appear.

Returns

Type	Description
GridViewExtension	A GridViewExtension object representing the GridView extension.

Remarks

Using the BindToEF method, you can easily bind the GridView to Entity Framework data models. Simply call the method, pass the DataContext and table name as method parameters, and specify the key field via the GridView’s GridSettingsBase.KeyFieldName property.

Internally, the BindToEF method uses our EntityServerModeDataSource component, which was specifically designed to allow the GridView 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 GridView. In this mode, the GridView loads records on demand and performs data-aware operations (sorting, filtering, grouping, etc.) on the data server. This technique significantly improves the GridView’s speed and responsiveness.

Example

The code sample below demonstrates how to catch the internal exception thrown when using the Database Server Mode data binding approach.

View code (Razor):

C#

@Html.DevExpress().GridView(settings => {
    // GridView settings
}).BindToEF(string.Empty, string.Empty, (s, e) => {
    // Specify queryable source
    var dataContext = new MyProject.Models.LargeDatabaseDataContext();
    e.QueryableSource = dataContext.Emails;
    e.KeyExpression = "Id";
}, (s, e) => {
    // Handle internal exception
    ViewContext.Writer.Write(e.Exception.Message + Environment.NewLine + e.Exception.StackTrace);
}).GetHtml()