RepositoryItemComboBox Class

Represents a repository item which stores settings specific to ComboBoxEdit controls.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v23.2.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

public class RepositoryItemComboBox :
    RepositoryItemPopupBaseAutoSearchEdit,
    IDxHtmlDesignerDataProvider

VB.NET

Public Class RepositoryItemComboBox
    Inherits RepositoryItemPopupBaseAutoSearchEdit
    Implements IDxHtmlDesignerDataProvider

Related API Members

The following members return RepositoryItemComboBox objects:

Library	Related API Members
WinForms Controls	ComboBoxEdit.Properties
	FilterPopupListBoxEventArgs.ComboBox
.NET Reporting Tools	XRDesignBarManager.FontNameBox
	XRDesignBarManager.FontSizeBox

Remarks

The RepositoryItemComboBox class provides properties and events specific to ComboBoxEdit controls. You can access these settings via the editor’s ComboBoxEdit.Properties property.

The main settings provided by the RepositoryItemComboBox class include:

• the RepositoryItemComboBox.Items property holding a collection of items to display in the dropdown list;
• the RepositoryItemComboBox.AutoComplete property specifying whether end-users can select items by typing the first characters;
• the RepositoryItemComboBox.CycleOnDblClick property allowing you to cycle through items by double-clicking the edit box;
• the RepositoryItemComboBox.DrawItem event allowing you to custom paint dropdown list items.

You only have to create standalone repository items to specify inplace editors for container controls.

Example

The following example creates a GridControl at runtime and shows how to perform basic customization tasks:

• Bind the grid to a data source
• Access the View that displays the underlying data
• Access columns
• Assign an in-place editor (a combo box editor) to a column
• Sort and group data
• Calculate total and group summaries
• Create a filter
• Hide columns and calculate column “best” widths
• Expand group rows
• Focus a specific cell
• Specify DataAnnotation attributes (column display names and data formats) at the data source level

Note

Add the corresponding assemblies to your Windows Forms project.

Read the following topic for information: Redistribution and Deployment.

C#

using System;
using DevExpress.ClipboardSource.SpreadsheetML;
using DevExpress.Data;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Columns;
using DevExpress.XtraGrid.Views.Grid;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

namespace DXApplication {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            this.Load += Form1_Load;
        }
        private void Form1_Load(object sender, EventArgs e) {
            GridControl gridControl1 = new GridControl() {
                Name = "gridControl1",
                Parent = this,
                Dock = DockStyle.Fill
            };
            gridControl1.DataSource = DataHelper.GetData(30);
            // The grid automatically creates columns for the public fields found in the data source. 
            // Calling the gridView1.PopulateColumns method is not required unless gridView1.OptionsBehavior.AutoPopulateColumns is disabled.

            // The grid automatically creates a GridView that displays the underlying data as a two-dimensional table.
            GridView gridView1 = gridControl1.MainView as GridView;

            // Obtain created columns.
            GridColumn colCompany = gridView1.Columns["CompanyName"];
            GridColumn colID = gridView1.Columns["ID"];
            GridColumn colDate = gridView1.Columns["RequiredDate"];
            GridColumn colPayment = gridView1.Columns["Value"];
            GridColumn colProcessed = gridView1.Columns["Processed"];

            // The Company column uses a ComboBox in-place editor that shows a list of available companies.
            RepositoryItemComboBox riComboBox = new RepositoryItemComboBox();
            riComboBox.Items.AddRange(DataHelper.companies);
            gridControl1.RepositoryItems.Add(riComboBox);
            colCompany.ColumnEdit = riComboBox;

            // Hide a column.
            colID.Visible = false;

            // Group and sort data.
            colCompany.GroupIndex = 0;
            colDate.SortIndex = 0;
            colDate.SortOrder = DevExpress.Data.ColumnSortOrder.Descending;

            // Show group columns in the table.
            gridView1.OptionsView.ShowGroupedColumns = true;

            // Expand group rows.
            gridView1.ExpandAllGroups();

            // Apply a filter.
            gridView1.ActiveFilterString = "[RequiredDate]>= #" + DateTime.Today.ToString() + "#";

            // Calculate two total summaries.
            colDate.Summary.Add(SummaryItemType.Count, colDate.FieldName, "Count={0}");
            colDate.Summary.Add(SummaryItemType.Max, colDate.FieldName, "Max={0:d}");
            gridView1.OptionsView.ShowFooter = true;

            // Calculate group summaries.
            GridGroupSummaryItem item = new GridGroupSummaryItem();
            item.FieldName = colCompany.FieldName;
            item.SummaryType = DevExpress.Data.SummaryItemType.Count;
            gridView1.GroupSummary.Add(item);

            GridGroupSummaryItem item1 = new GridGroupSummaryItem();
            item1.FieldName = colPayment.FieldName;
            item1.SummaryType = SummaryItemType.Sum;
            item1.DisplayFormat = "group total={0:c2}";
            item1.ShowInGroupColumnFooter = colPayment;
            gridView1.GroupSummary.Add(item1);

            // Forcibly move group footer summaries to positions in group rows under corresponding column headers. 
            gridView1.OptionsBehavior.AlignGroupSummaryInGroupRow = DevExpress.Utils.DefaultBoolean.True;

            // Focus a specific cell.
            gridView1.FocusedRowHandle = 1;
            gridView1.FocusedColumn = colCompany;

            // Optimize column widths.
            colDate.BestFit();
            colProcessed.BestFit();
        }
    }

    public class Record : INotifyPropertyChanged {
        public Record() {
        }
        int id;
        public int ID {
            get { return id; }
            set {
                if(id != value) {
                    id = value;
                    OnPropertyChanged();
                }
            }
        }

        string text;
        [DisplayName("Company")]
        public string CompanyName {
            get { return text; }
            set {
                if(text != value) {
                    if(string.IsNullOrEmpty(value))
                        throw new Exception();
                    text = value;
                    OnPropertyChanged();
                }
            }
        }
        Nullable<decimal> val;
        [DataType(System.ComponentModel.DataAnnotations.DataType.Currency)]
        [DisplayName("Payment")]
        public Nullable<decimal> Value {
            get { return val; }
            set {
                if(val != value) {
                    val = value;
                    OnPropertyChanged();
                }
            }
        }
        DateTime dt;
        [DisplayFormat(DataFormatString = "d")]
        public DateTime RequiredDate {
            get { return dt; }
            set {
                if(dt != value) {
                    dt = value;
                    OnPropertyChanged();
                }
            }
        }
        bool state;
        public bool Processed {
            get { return state; }
            set {
                if(state != value) {
                    state = value;
                    OnPropertyChanged();
                }
            }
        }

        public override string ToString() {
            return string.Format("ID = {0}, Text = {1}", ID, CompanyName);
        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string propertyName = "") {
            if(PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public class DataHelper {

        public static string[] companies = new string[] { "Hanari Carnes", "Que Delícia", "Romero y tomillo", "Mère Paillarde",
            "Comércio Mineiro", "Reggiani Caseifici", "Maison Dewey" };
        public static BindingList<Record> GetData(int count) {
            BindingList<Record> records = new BindingList<Record>();
            Random rnd = new Random();
            for(int i = 0; i < count; i++) {
                int n = rnd.Next(10);
                records.Add(new Record() {
                    ID = i + 100,
                    CompanyName = companies[i % companies.Length],
                    RequiredDate = DateTime.Today.AddDays(n - 5),
                    Value = i % 2 == 0 ? (i + 1) * 123 : i * 231,
                    Processed = i % 2 == 0,
                });
            };
            return records;
        }
    }

}

VB.NET

Imports System
Imports DevExpress.ClipboardSource.SpreadsheetML
Imports DevExpress.Data
Imports DevExpress.XtraEditors
Imports DevExpress.XtraEditors.Repository
Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Columns
Imports DevExpress.XtraGrid.Views.Grid
Imports System.ComponentModel
Imports System.ComponentModel.DataAnnotations
Imports System.Runtime.CompilerServices
Imports System.Windows.Forms

Namespace DXApplication
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            AddHandler Me.Load, AddressOf Form1_Load
        End Sub
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            Dim gridControl1 As New GridControl() With {.Name = "gridControl1", .Parent = Me, .Dock = DockStyle.Fill}
            gridControl1.DataSource = DataHelper.GetData(30)
            ' The grid automatically creates columns for the public fields found in the data source. 
            ' Calling the gridView1.PopulateColumns method is not required unless gridView1.OptionsBehavior.AutoPopulateColumns is disabled.

            ' The grid automatically creates a GridView that displays the underlying data as a two-dimensional table.
            Dim gridView1 As GridView = TryCast(gridControl1.MainView, GridView)

            ' Obtain created columns.
            Dim colCompany As GridColumn = gridView1.Columns("CompanyName")
            Dim colID As GridColumn = gridView1.Columns("ID")
            Dim colDate As GridColumn = gridView1.Columns("RequiredDate")
            Dim colPayment As GridColumn = gridView1.Columns("Value")
            Dim colProcessed As GridColumn = gridView1.Columns("Processed")

            ' The Company column uses a ComboBox in-place editor that shows a list of available companies.
            Dim riComboBox As New RepositoryItemComboBox()
            riComboBox.Items.AddRange(DataHelper.companies)
            gridControl1.RepositoryItems.Add(riComboBox)
            colCompany.ColumnEdit = riComboBox

            ' Hide a column.
            colID.Visible = False

            ' Group and sort data.
            colCompany.GroupIndex = 0
            colDate.SortIndex = 0
            colDate.SortOrder = DevExpress.Data.ColumnSortOrder.Descending

            ' Show group columns in the table.
            gridView1.OptionsView.ShowGroupedColumns = True

            ' Expand group rows.
            gridView1.ExpandAllGroups()

            ' Apply a filter.
            gridView1.ActiveFilterString = "[RequiredDate]>= #" & Date.Today.ToString() & "#"

            ' Calculate two total summaries.
            colDate.Summary.Add(SummaryItemType.Count, colDate.FieldName, "Count={0}")
            colDate.Summary.Add(SummaryItemType.Max, colDate.FieldName, "Max={0:d}")
            gridView1.OptionsView.ShowFooter = True

            ' Calculate group summaries.
            Dim item As New GridGroupSummaryItem()
            item.FieldName = colCompany.FieldName
            item.SummaryType = DevExpress.Data.SummaryItemType.Count
            gridView1.GroupSummary.Add(item)

            Dim item1 As New GridGroupSummaryItem()
            item1.FieldName = colPayment.FieldName
            item1.SummaryType = SummaryItemType.Sum
            item1.DisplayFormat = "group total={0:c2}"
            item1.ShowInGroupColumnFooter = colPayment
            gridView1.GroupSummary.Add(item1)

            ' Forcibly move group footer summaries to positions in group rows under corresponding column headers. 
            gridView1.OptionsBehavior.AlignGroupSummaryInGroupRow = DevExpress.Utils.DefaultBoolean.True

            ' Focus a specific cell.
            gridView1.FocusedRowHandle = 1
            gridView1.FocusedColumn = colCompany

            ' Optimize column widths.
            colDate.BestFit()
            colProcessed.BestFit()
        End Sub
    End Class

    Public Class Record
        Implements INotifyPropertyChanged

        Public Sub New()
        End Sub

        Private id_Renamed As Integer
        Public Property ID() As Integer
            Get
                Return id_Renamed
            End Get
            Set(ByVal value As Integer)
                If id_Renamed <> value Then
                    id_Renamed = value
                    OnPropertyChanged()
                End If
            End Set
        End Property

        Private text As String
        <DisplayName("Company")>
        Public Property CompanyName() As String
            Get
                Return text
            End Get
            Set(ByVal value As String)
                If text <> value Then
                    If String.IsNullOrEmpty(value) Then
                        Throw New Exception()
                    End If
                    text = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private val? As Decimal
        <DataType(System.ComponentModel.DataAnnotations.DataType.Currency), DisplayName("Payment")>
        Public Property Value() As Decimal?
            Get
                Return val
            End Get
            Set(ByVal value? As Decimal)
                If Not val.Equals(value) Then
                    val = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private dt As Date
        <DisplayFormat(DataFormatString := "d")>
        Public Property RequiredDate() As Date
            Get
                Return dt
            End Get
            Set(ByVal value As Date)
                If dt <> value Then
                    dt = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private state As Boolean
        Public Property Processed() As Boolean
            Get
                Return state
            End Get
            Set(ByVal value As Boolean)
                If state <> value Then
                    state = value
                    OnPropertyChanged()
                End If
            End Set
        End Property

        Public Overrides Function ToString() As String
            Return String.Format("ID = {0}, Text = {1}", ID, CompanyName)
        End Function

        Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
        Protected Sub OnPropertyChanged(Optional <CallerMemberName> ByVal propertyName As String = "")
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
        End Sub
    End Class

    Public Class DataHelper

        Public Shared companies() As String = { "Hanari Carnes", "Que Delícia", "Romero y tomillo", "Mère Paillarde", "Comércio Mineiro", "Reggiani Caseifici", "Maison Dewey" }
        Public Shared Function GetData(ByVal count As Integer) As BindingList(Of Record)
            Dim records As New BindingList(Of Record)()
            Dim rnd As New Random()
            For i As Integer = 0 To count - 1
                Dim n As Integer = rnd.Next(10)
                records.Add(New Record() With {.ID = i + 100, .CompanyName = companies(i Mod companies.Length), .RequiredDate = Date.Today.AddDays(n - 5), .Value = If(i Mod 2 = 0, (i + 1) * 123, i * 231), .Processed = i Mod 2 = 0})
            Next i
            Return records
        End Function
    End Class

End Namespace

Inheritance

Show 16 items

Object

MarshalByRefObject

Component

DevExpress.XtraEditors.ComponentBase

RepositoryItem

RepositoryItemTextEdit

RepositoryItemButtonEdit

RepositoryItemPopupBase

RepositoryItemPopupBaseAutoSearchEdit

RepositoryItemComboBox

RepositoryItemBreadCrumbEdit

RepositoryItemMRUEdit

RepositoryItemImageComboBox

RepositoryItemPickImage

RepositoryItemSearchControl

RepositoryItemFontEdit