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 End-User Documentation

LinqInstantFeedbackSource Class

The data source for the GridControl and SearchLookUpEdit that binds these controls to any queryable source ('LINQ to SQL Classes') in Instant Feedback Mode.

Namespace:DevExpress.Data.Linq
Assembly:DevExpress.Data.v17.1.dll

Expanded Syntax

Expanded Remarks

Instant Feedback binding mode is an improvement over regular server mode. In server mode, the Grid Control loads data in small portions and delegates all data operations (sorting, grouping, filtering and calculating summaries) to the data server. This is the key to the server mode's high efficiency when working with large volumes of data. The only drawback to using server mode involves data operations when the connection to the server is slow. In this instance, the bound control freezes until the data server completes operations and retrieves results. With Instant Feedback binding mode, data operations are performed asynchronously in a background thread, and both the bound control and the application remain highly responsive. Currently, this mode is supported by the DevExpress.XtraGrid.GridControl and DevExpress.XtraEditors.SearchLookUpEdit controls.

For additional information on Instant Feedback mode, refer to the Server Mode section.

Note

The LinqInstantFeedbackSource is a read-only data source.

Expanded Example

This example demonstrates how to initialize a LinqInstantFeedbackSource, to retrieve data from a "Purchasing.PurchaseOrderHeader" data table (included in the AdventureWorks database shipped with MS SQL Server). The PurchaseOrderHeader persistent class is declared, and mapped to the "Purchasing.PurchaseOrderHeader" data table using the System.Data.Linq.Mapping.TableAttribute attribute. Then, a System.Data.Linq.Table<PurchaseOrderHeader> is passed to the LinqInstantFeedbackSource in the GetQueryable event handler.

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          LinqInstantFeedbackSource

Expanded See Also

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