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 End-User Documentation

GridLookUpEdit Class

The editor that provides lookup functionality using a dropdown feature-rich data grid (GridControl).

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraGrid.v17.2.dll

Expanded Syntax

Expanded Remarks

A lookup editor is an editor with an embedded dropdown window that displays lookup records (the records from which an end-user can select). When a lookup record is selected, the editor's value (the BaseEdit.EditValue bindable property) and display text are modified accordingly.

The GridLookUpEdit displays lookup records in the dropdown using the feature-rich data grid - GridControl. By default, lookup records are presented in the standard column-row format, using a GridView View.

You can specify a different View to present data with the RepositoryItemGridLookUpEditBase.PopupViewType property (e.g., in a card format). The settings of the chosen View can be accessed and customized via the RepositoryItemGridLookUpEditBase.PopupView property.

To learn how to set up lookup editors in different binding modes, see the following topics:

You may want to filter the popup data source of one (secondary) lookup editor based on the value of another (primary) lookup editor. This scenario is covered in the following topic:

Expanded Additional Customization

The following list shows some of the members that help you perform additional customization of the GridLookUpEdit control.

To embed a GridLookUpEdit in a cell within a container control (XtraGrid, XtraTreeList, etc), use the RepositoryItemGridLookUpEdit component. See the Repositories and Repository Items topic, for more information.

Note

The GridLookUpEdit control does not support Instant Feedback Mode.

Note

The GridLookUpEdit and SearchLookUpEdit controls do not have a connection to their underlying data sources while their dropdown windows are closed. So in this instance it is not possible to access the underlying data or a grid's calculated data using methods provided by the embedded Grid Control and its View. You can use these methods only when the controls' dropdown windows are open.

While the dropdown windows are closed, you can access the underlying data using methods provided by the underlying data source.

Note

The Find Panel is not supported for the GridLookUpEdit's dropdown GridControl. If you need to enable the Find Panel for a look up editor, use the SearchLookUpEdit control instead.

Expanded Example 1

The following example demonstrates how to create and customize a GridLookUpEdit control at runtime.

In the example, a lookup editor will be used to edit the values of the "ProductID" field in the "Order Details" table (NWind database). It must display a list of the available products in the dropdown, which are stored in the "Products" table in the NWind database. By selecting a row from the dropdown an end-user will change the current order's product. Also a data navigator will be created that will assist an end-user to navigate through the "Order Details" table.

To implement the required functionality the following key properties of the lookup editor must be set:

  • The editor's BaseEdit.EditValue property is bound to the "ProductID" field in the "Order Details" table via the DataBindings property.
  • The editor's RepositoryItemLookUpEditBase.DataSource property is set to a DataView object which contains rows from the "Products" table in the NWind database.
  • The editor's RepositoryItemLookUpEditBase.ValueMember property is set to the "ProductID" field in the "Products" table. This field's value must match the editor's edit value, and so the "ProductID" field in the "Order Details" table.
  • The editor's RepositoryItemLookUpEditBase.DisplayMember property is set to the "ProductName" field in the "Products" table. This identifies the field in the DataSource whose values match the editor's display text.
  • Two columns are created within the underlying View via the ColumnView.Columns property. These will display values from the "ProductID" and "ProductName" fields in the dropdown data source.

The result of the example is shown in the following image:

Expanded Example 2

Assume that a GridLookUpEdit control needs to be used in multiple places, and all editors must display data from one predefined data source and contain predefined columns. In this instance, you can create a custom GridLookUpEdit control.

This example shows how to create a custom GridLookUpEdit control, and initialize its properties as required. The structure of descendant classes is based on the code template shown in the Custom Editors.Editors Structure topic.

To customize the control's settings, the OnLoaded method is overridden. In this method, the control's DataSource, columns and some other options are initialized. Note that columns created in this method are not accessible at design time.

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          System.Windows.Forms.Control
             ControlBase
                BaseControl
                   BaseEdit
                      TextEdit
                         ButtonEdit
                            PopupBaseEdit
                               PopupBaseAutoSearchEdit
                                  LookUpEditBase
                                     GridLookUpEditBase
                                        GridLookUpEdit

Expanded See Also

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