RepositoryItemLookUpEditBase.DataSource Property

Gets or sets the source of data displayed in the dropdown window.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v20.2.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

[DefaultValue(null)]
[DXCategory("Data")]
public object DataSource { get; set; }

VB.NET

<DXCategory("Data")>
<DefaultValue(Nothing)>
Public Property DataSource As Object

Property Value

Type	Default	Description
Object	*null*	The source of data displayed in the dropdown.

Remarks

Use the DataSource property to specify the source of rows to display in the dropdown. The data source can represent any object that implements the IList or IListSource interfaces. Thus you can bind a lookup editor to an array or a collection of class objects, DataView, DataTable objects, etc.

A lookup editor allows you to use unbound columns - columns that display custom data that does not exist in the data source. To populate unbound columns in a LookUpEdit control, use the LookUpEdit.GetNotInListValue (or RepositoryItemLookUpEdit.GetNotInListValue) event. For information on how to implement unbound columns in a View that is embedded into the GridLookUpEdit control, see the Unbound Columns topic.

Refer to the LookUpEdit topic for information on customizing a lookup editor.

Dictionary as a Data Source

If you use a Dictionary<TKey,TValue> as a data source for a lookup editor, the editor uses keys and values as follows:

• the TKey values — as actual values. These values are assigned to the editor when a user selects an item in the drop-down box.
• the TValue values — as string representations of the actual values. These strings are displayed in the edit box and drop-down window.

There is no need to specify the ValueMember and DisplayMember properties.

Note

The TKey and TValue parameters should be of the String type or a value type. For example, keys are integers and values are strings.

See the following topic for more information: Dictionary as a Data Source for a Lookup Editor.

Example

This example shows how to use an in-place LookUpEdit control (RepositoryItemLookUpEdit) to edit cells in a grid column.

The lookup editor is assigned to the CategoryID column. The editor displays category names in the edit box instead of category IDs (see the DisplayMember setting).

View Example

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace LookupEdit_StandardBinding {
    static class Program {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

Form1.cs

using DevExpress.XtraEditors.Repository;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace LookupEdit_StandardBinding {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            InitData();

            gridControl1.DataSource = Products;
            gridView1.Columns["UnitPrice"].DisplayFormat.FormatType = DevExpress.Utils.FormatType.Numeric;
            gridView1.Columns["UnitPrice"].DisplayFormat.FormatString = "c2";

            // Create an in-place LookupEdit control.
            RepositoryItemLookUpEdit riLookup = new RepositoryItemLookUpEdit();
            riLookup.DataSource = Categories;
            riLookup.ValueMember = "ID";
            riLookup.DisplayMember = "CategoryName";

            // Enable the "best-fit" functionality mode in which columns have proportional widths and the popup window is resized to fit all the columns.
            riLookup.BestFitMode = DevExpress.XtraEditors.Controls.BestFitMode.BestFitResizePopup;
            // Specify the dropdown height.
            riLookup.DropDownRows = Categories.Count;

            // Enable the automatic completion feature. In this mode, when the dropdown is closed, 
            // the text in the edit box is automatically completed if it matches a DisplayMember field value of one of dropdown rows. 
            riLookup.SearchMode = DevExpress.XtraEditors.Controls.SearchMode.AutoComplete;
            // Specify the column against which an incremental search is performed in SearchMode.AutoComplete and SearchMode.OnlyInPopup modes
            riLookup.AutoSearchColumnIndex = 1;

            // Optionally hide the Description column in the dropdown.
            // riLookup.PopulateColumns();
            // riLookup.Columns["Description"].Visible = false;

            gridControl1.RepositoryItems.Add(riLookup);

            // Assign the in-place LookupEdit control to the grid's CategoryID column.
            // Note that the data types of the "ID" and "CategoryID" fields match.
            gridView1.Columns["CategoryID"].ColumnEdit = riLookup;
            gridView1.BestFitColumns();
        }

        List<Product> Products = new List<Product>();
        List<Category> Categories = new List<Category>();

        private void InitData() {
            Products.Add(new Product() { ProductName = "Sir Rodney's Scones", CategoryID = 3, UnitPrice = 10 });
            Products.Add(new Product() { ProductName = "Gustaf's Knäckebröd", CategoryID = 5, UnitPrice = 21 });
            Products.Add(new Product() { ProductName = "Tunnbröd", CategoryID = 5, UnitPrice = 9 });
            Products.Add(new Product() { ProductName = "Guaraná Fantástica", CategoryID = 1, UnitPrice = 4.5m });
            Products.Add(new Product() { ProductName = "NuNuCa Nuß-Nougat-Creme", CategoryID = 3, UnitPrice = 14 });
            Products.Add(new Product() { ProductName = "Gumbär Gummibärchen", CategoryID = 3, UnitPrice = 31.23m });
            Products.Add(new Product() { ProductName = "Rössle Sauerkraut", CategoryID = 7, UnitPrice = 45.6m });
            Products.Add(new Product() { ProductName = "Thüringer Rostbratwurst", CategoryID = 6, UnitPrice = 123.79m });
            Products.Add(new Product() { ProductName = "Nord-Ost Matjeshering", CategoryID = 8, UnitPrice = 25.89m });
            Products.Add(new Product() { ProductName = "Gorgonzola Telino", CategoryID = 4, UnitPrice = 12.5m });

            Categories.Add(new Category() { ID = 1, CategoryName = "Beverages", Description = "Soft drinks, coffees, teas, beers, and ales" });
            Categories.Add(new Category() { ID = 2, CategoryName = "Condiments", Description = "Sweet and savory sauces, relishes, spreads, and seasonings" });
            Categories.Add(new Category() { ID = 3, CategoryName = "Confections", Description = "Desserts, candies, and sweet breads" });
            Categories.Add(new Category() { ID = 4, CategoryName = "Dairy Products", Description = "Cheeses" });
            Categories.Add(new Category() { ID = 5, CategoryName = "Grains/Cereals", Description = "Breads, crackers, pasta, and cereal" });
            Categories.Add(new Category() { ID = 6, CategoryName = "Meat/Poultry", Description = "Prepared meats" });
            Categories.Add(new Category() { ID = 7, CategoryName = "Produce", Description = "Dried fruit and bean curd" });
            Categories.Add(new Category() { ID = 8, CategoryName = "Seafood", Description = "Seaweed and fish" });
        }
    }

    public class Product {
        public string ProductName { get; set; }
        public decimal UnitPrice { get; set; }
        public int CategoryID { get; set; }
    }

    public class Category {
        public int ID { get; set; }
        public string CategoryName { get; set; }
        public string Description { get; set; }
    }
}

Form1.vb

Imports DevExpress.XtraEditors.Repository
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Threading.Tasks
Imports System.Windows.Forms

Namespace LookupEdit_StandardBinding
    Partial Public Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
            InitData()

            gridControl1.DataSource = Products
            gridView1.Columns("UnitPrice").DisplayFormat.FormatType = DevExpress.Utils.FormatType.Numeric
            gridView1.Columns("UnitPrice").DisplayFormat.FormatString = "c2"

            ' Create an in-place LookupEdit control.
            Dim riLookup As New RepositoryItemLookUpEdit()
            riLookup.DataSource = Categories
            riLookup.ValueMember = "ID"
            riLookup.DisplayMember = "CategoryName"

            ' Enable the "best-fit" functionality mode in which columns have proportional widths and the popup window is resized to fit all the columns.
            riLookup.BestFitMode = DevExpress.XtraEditors.Controls.BestFitMode.BestFitResizePopup
            ' Specify the dropdown height.
            riLookup.DropDownRows = Categories.Count

            ' Enable the automatic completion feature. In this mode, when the dropdown is closed, 
            ' the text in the edit box is automatically completed if it matches a DisplayMember field value of one of dropdown rows. 
            riLookup.SearchMode = DevExpress.XtraEditors.Controls.SearchMode.AutoComplete
            ' Specify the column against which an incremental search is performed in SearchMode.AutoComplete and SearchMode.OnlyInPopup modes
            riLookup.AutoSearchColumnIndex = 1

            ' Optionally hide the Description column in the dropdown.
            ' riLookup.PopulateColumns();
            ' riLookup.Columns["Description"].Visible = false;

            gridControl1.RepositoryItems.Add(riLookup)

            ' Assign the in-place LookupEdit control to the grid's CategoryID column.
            ' Note that the data types of the "ID" and "CategoryID" fields match.
            gridView1.Columns("CategoryID").ColumnEdit = riLookup
            gridView1.BestFitColumns()
        End Sub

        Private Products As New List(Of Product)()
        Private Categories As New List(Of Category)()

        Private Sub InitData()
            Products.Add(New Product() With {.ProductName = "Sir Rodney's Scones", .CategoryID = 3, .UnitPrice = 10})
            Products.Add(New Product() With {.ProductName = "Gustaf's Knäckebröd", .CategoryID = 5, .UnitPrice = 21})
            Products.Add(New Product() With {.ProductName = "Tunnbröd", .CategoryID = 5, .UnitPrice = 9})
            Products.Add(New Product() With {.ProductName = "Guaraná Fantástica", .CategoryID = 1, .UnitPrice = 4.5D})
            Products.Add(New Product() With {.ProductName = "NuNuCa Nuß-Nougat-Creme", .CategoryID = 3, .UnitPrice = 14})
            Products.Add(New Product() With {.ProductName = "Gumbär Gummibärchen", .CategoryID = 3, .UnitPrice = 31.23D})
            Products.Add(New Product() With {.ProductName = "Rössle Sauerkraut", .CategoryID = 7, .UnitPrice = 45.6D})
            Products.Add(New Product() With {.ProductName = "Thüringer Rostbratwurst", .CategoryID = 6, .UnitPrice = 123.79D})
            Products.Add(New Product() With {.ProductName = "Nord-Ost Matjeshering", .CategoryID = 8, .UnitPrice = 25.89D})
            Products.Add(New Product() With {.ProductName = "Gorgonzola Telino", .CategoryID = 4, .UnitPrice = 12.5D})

            Categories.Add(New Category() With {.ID = 1, .CategoryName = "Beverages", .Description = "Soft drinks, coffees, teas, beers, and ales"})
            Categories.Add(New Category() With {.ID = 2, .CategoryName = "Condiments", .Description = "Sweet and savory sauces, relishes, spreads, and seasonings"})
            Categories.Add(New Category() With {.ID = 3, .CategoryName = "Confections", .Description = "Desserts, candies, and sweet breads"})
            Categories.Add(New Category() With {.ID = 4, .CategoryName = "Dairy Products", .Description = "Cheeses"})
            Categories.Add(New Category() With {.ID = 5, .CategoryName = "Grains/Cereals", .Description = "Breads, crackers, pasta, and cereal"})
            Categories.Add(New Category() With {.ID = 6, .CategoryName = "Meat/Poultry", .Description = "Prepared meats"})
            Categories.Add(New Category() With {.ID = 7, .CategoryName = "Produce", .Description = "Dried fruit and bean curd"})
            Categories.Add(New Category() With {.ID = 8, .CategoryName = "Seafood", .Description = "Seaweed and fish"})
        End Sub
    End Class

    Public Class Product
        Public Property ProductName() As String
        Public Property UnitPrice() As Decimal
        Public Property CategoryID() As Integer
    End Class

    Public Class Category
        Public Property ID() As Integer
        Public Property CategoryName() As String
        Public Property Description() As String
    End Class
End Namespace

Program.vb

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Threading.Tasks
Imports System.Windows.Forms

Namespace LookupEdit_StandardBinding
    Friend NotInheritable Class Program

        Private Sub New()
        End Sub

        ''' <summary>
        ''' The main entry point for the application.
        ''' </summary>
        <STAThread>
        Shared Sub Main()
            Application.EnableVisualStyles()
            Application.SetCompatibleTextRenderingDefault(False)
            Application.Run(New Form1())
        End Sub
    End Class
End Namespace

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the DataSource property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-filter-a-second-lookup-column-based-on-a-first-lookup-columns-value-in-editform-t120863/CS/FilterLookUpsEditForm/FormSingleSource.cs#L20

RepositoryItemLookUpEdit ritem = new RepositoryItemLookUpEdit(); // for Type column
ritem.DataSource = GetLookData();
ritem.ValueMember = "ID";

how-to-provide-the-capability-to-show-tooltips-for-lookupedit-items-e3040/CS/LookUpEditWithHints/Form1.cs#L23

{
    lookUpEditHints1.Properties.DataSource = FillTable();
    lookUpEditHints1.Properties.DisplayMember = "Customer";

lookupedit-how-to-revert-to-the-previous-value-if-search-text-cannot-be-located-t191165/CS/Form1.cs#L19

RepositoryItemCustomLookUpEdit ritem = new RepositoryItemCustomLookUpEdit();
ritem.DataSource = GetData(10);
ritem.ValueMember = "Name";

Reporting_how-to-create-a-label-report-at-runtime-t473792/CS/dxWinFormsSample/Form1.cs#L56

lookUpLabelProduct.Properties.BeginInit();
lookUpLabelProduct.Properties.DataSource = helper.GetLabelProducts().ToList();
lookUpLabelProduct.Properties.View.OptionsBehavior.AutoPopulateColumns = false;

lookup-editors-combobox-mode-t378371/CS/Lookup-ComboboxMode/Form1.cs#L32

lookUpEdit1.Properties.DataSource = colors;
lookUpEdit1.Properties.TextEditStyle = DevExpress.XtraEditors.Controls.TextEditStyles.Standard;

VB.NET

how-to-filter-a-second-lookup-column-based-on-a-first-lookup-columns-value-in-editform-t120863/VB/FilterLookUpsEditForm/FormSingleSource.vb#L19

Dim ritem As New RepositoryItemLookUpEdit() ' for Type column
ritem.DataSource = GetLookData()
ritem.ValueMember = "ID"

how-to-provide-the-capability-to-show-tooltips-for-lookupedit-items-e3040/VB/LookUpEditWithHints/Form1.vb#L21

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    lookUpEditHints1.Properties.DataSource = FillTable()
    lookUpEditHints1.Properties.DisplayMember = "Customer"

lookupedit-how-to-revert-to-the-previous-value-if-search-text-cannot-be-located-t191165/VB/Form1.vb#L21

Dim ritem As New RepositoryItemCustomLookUpEdit()
ritem.DataSource = GetData(10)
ritem.ValueMember = "Name"

Reporting_how-to-create-a-label-report-at-runtime-t473792/VB/dxWinFormsSample/Form1.vb#L48

lookUpLabelProduct.Properties.BeginInit()
lookUpLabelProduct.Properties.DataSource = helper.GetLabelProducts().ToList()
lookUpLabelProduct.Properties.View.OptionsBehavior.AutoPopulateColumns = False

lookup-editors-combobox-mode-t378371/VB/Lookup-ComboboxMode/Form1.vb#L33

lookUpEdit1.Properties.DataSource = colors
lookUpEdit1.Properties.TextEditStyle = DevExpress.XtraEditors.Controls.TextEditStyles.Standard