RepositoryItemLookUpEdit.EnableEditValueCollectionEditing Property

Gets or sets whether you can bind the LookUpEdit.EditValue property to a read-only property of a collection type. With this option enabled, the editor calls the collection’s methods to add and remove items.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v24.2.dll

Declaration

C#

[DefaultValue(DefaultBoolean.Default)]
[DXCategory("Data")]
public virtual DefaultBoolean EnableEditValueCollectionEditing { get; set; }

VB.NET

<DXCategory("Data")>
<DefaultValue(DefaultBoolean.Default)>
Public Overridable Property EnableEditValueCollectionEditing As DefaultBoolean

Property Value

Type	Default	Description
DefaultBoolean	Default	True to use the collection’s methods to add and remove items. False to create a new collection each time the EditValue property is changed. Default is True if the EditValue property is bound to a read-only property of a collection type.

Available values:

Name	Description	Return Value
True	The value is true.	0
False	The value is false.	1
Default	The value is specified by a global option or a higher-level object.	2

Remarks

In ValueList multiple selection mode, the LookUpEdit.EditValue property contains a List<object> object with selected items. The EnableEditValueCollectionEditing property allows you to bind the EditValue property to a read-only property of a collection type (for example, a HashSet<T>).

C#

public partial class Form1 : Form {
    Employee person;
    List<Department> departments;
    public Form1() {
        InitializeComponent();
        person = new Employee {
            ID = 1,
            FullName = "John Smith",
        };
        departments = new List<Department> {
            new Department() { ID = 1, Name = "IT Department" },
            new Department() { ID = 2, Name = "Sales" },
            new Department() { ID = 3, Name = "Management" },
            new Department() { ID = 4, Name = "Support" },
            new Department() { ID = 5, Name = "Human Resources" },
            new Department() { ID = 6, Name = "Engineering" },
            new Department() { ID = 7, Name = "Shipping" },
        };
        // Populates binding sources with data.
        employeeBindingSource.DataSource = person;
        departmentBindingSource.DataSource = departments;

        leDepartments.Properties.DataSource = departmentBindingSource;
        leDepartments.Properties.ValueMember = "ID";
        leDepartments.Properties.DisplayMember = "Name";
        leDepartments.Properties.EditValueType = DevExpress.XtraEditors.Repository.LookUpEditValueType.ValueList;
        // Binds the editor's EditValue property to the Employee.Departments property.
        leDepartments.DataBindings.Add(new Binding("EditValue", employeeBindingSource, "Departments", true, DataSourceUpdateMode.OnPropertyChanged));
    }
}

public class Employee {
    public Employee() {
        Departments = new HashSet<int>();
    }
    public int ID { get; set; }
    public string FullName { get; set; }
    // Creates a read-only property of the HashSet<T> type.
    public HashSet<int> Departments { get; private set; }
}
public class Department {
    public int ID { get; set; }
    public string Name { get; set; }
}

VB.NET

Partial Public Class Form1
  Inherits Form

  Private person As Employee
  Private departments As List(Of Department)
  Public Sub New()
    InitializeComponent()
    person = New Employee With { .ID = 1, .FullName = "John Smith" }
    departments = New List(Of Department) From {
      New Department() With { .ID = 1, .Name = "IT Department" },
      New Department() With { .ID = 2, .Name = "Sales" },
      New Department() With { .ID = 3, .Name = "Management" },
      New Department() With { .ID = 4, .Name = "Support" },
      New Department() With { .ID = 5, .Name = "Human Resources" },
      New Department() With { .ID = 6, .Name = "Engineering" },
      New Department() With { .ID = 7, .Name = "Shipping" }
    }
    ' Populates binding sources with data.
    employeeBindingSource.DataSource = person
    departmentBindingSource.DataSource = departments

    leDepartments.Properties.DataSource = departmentBindingSource
    leDepartments.Properties.ValueMember = "ID"
    leDepartments.Properties.DisplayMember = "Name"
    leDepartments.Properties.EditValueType = DevExpress.XtraEditors.Repository.LookUpEditValueType.ValueList
    ' Binds the editor's EditValue property to the Employee.Departments property.
    leDepartments.DataBindings.Add(New Binding("EditValue", employeeBindingSource, "Departments", True, DataSourceUpdateMode.OnPropertyChanged))
  End Sub

  Public Class Employee
    Public Sub New()
      Departments = New HashSet(Of Integer)()
    End Sub
    Public Property ID() As Integer
    Public Property FullName() As String
    ' Creates a read-only property of the HashSet<T> type.
    Private privateDepartments As HashSet(Of Integer)
    Public Property Departments() As HashSet(Of Integer)
      Get
        Return privateDepartments
      End Get
      Private Set(ByVal value As HashSet(Of Integer))
        privateDepartments = value
      End Set
    End Property
  End Class
  Public Class Department
    Public Property ID() As Integer
    Public Property Name() As String
  End Class
End Class

Refer to the following help topic for more information: LookUpEdit - Enable Multiple Item Selection.