RepositoryItemCheckedComboBoxEdit.EditValueType Property
Gets or sets whether the editor’s edit value is formed as a string or as a List<object> object.
Namespace: DevExpress.XtraEditors.Repository
Assembly: DevExpress.XtraEditors.v19.1.dll
Declaration
[DXCategory("Data")]
[DefaultValue(EditValueTypeCollection.CSV)]
public EditValueTypeCollection EditValueType { get; set; }Property Value
| Type | Default | Description |
|---|---|---|
| DevExpress.XtraEditors.Repository.EditValueTypeCollection | **CSV** | An EditValueTypeCollection enumeration value that specifies how the edit value is formed. |
Remarks
By default, when the EditValueType property is set to CSV, the editor’s edit value is a string containing values (ListBoxItem.Value) of checked items separated by the RepositoryItemCheckedComboBoxEdit.SeparatorChar delimiter, followed by a space character.
Set the EditValueType property to List to form the edit value as a System.Collections.Generic.List<object> object. In this mode, the list items match the values (ListBoxItem.Value) of checked options in the editor’s dropdown window.
Note
To set the editor’s value when the control is used for standalone editing, use the CheckedComboBoxEdit.SetEditValue method. Do not set the editor’s EditValue directly.
Example
The code below populates the RepositoryItemCheckedComboBoxEdit.Items collection with five items, each item stores a string value.
The CheckedComboBoxEdit.SetEditValue method is called to select “Circle” and “Ellipse” items. The “Circle” item is then disabled so that users cannot de-select it.
Note that the code modifies the RepositoryItemCheckedComboBoxEdit.SeparatorChar property to change the edit value separator char from the default comma (“,”) to a semicolon (“;”). The same separator char must be used in the SetEditValue method parameter.
// Add check items to the control's dropdown.
string[] itemValues = new string[] {
"Circle", "Rectangle", "Ellipse",
"Triangle", "Square" };
foreach (string value in itemValues)
checkedComboBoxEdit1.Properties.Items.Add(value, CheckState.Unchecked, true);
// Specify the separator character.
checkedComboBoxEdit1.Properties.SeparatorChar = ';';
// Set the edit value.
checkedComboBoxEdit1.SetEditValue("Circle; Ellipse");
// Disable the Circle item.
checkedComboBoxEdit1.Properties.Items["Circle"].Enabled = false;
Example
The following example shows how to edit bit fields (a set of flags) in a CheckedComboBoxEdit control.
The control displays values of a custom MyColors enum, which has five simple flags (None through Yellow) and one combined flag (Green). Combined flags are not supported by the CheckedComboBoxEdit control. Items that correspond to these flags must be manually removed from the RepositoryItemCheckedComboBoxEdit.Items collection (see the removeCombinedFlags method which performs this operation).
The RepositoryItemCheckedComboBoxEdit.SetFlags method populates the RepositoryItemCheckedComboBoxEdit.Items collection with items corresponding to all available flags (except for a flag with a zero value). Then, the removeCombinedFlags method is called to remove items corresponding to combined flags. Finally, the editor’s initial value is specified using the CheckedComboBoxEdit.SetEditValue method.
The following image shows the result:
Note that the Green flag is not present in the dropdown list, although you can set this flag to the control’s value.
using DevExpress.XtraEditors.Repository;
[Flags]
enum MyColors {
None = 0x00,
Black = 0x01,
White = 0x02,
Blue = 0x04,
Yellow = 0x08,
Green = Blue | Yellow
}
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
// Populate the Items collection with all available flags.
checkedComboBoxEdit1.Properties.SetFlags(typeof(MyColors));
// Remove items that correspond to compound flags.
removeCombinedFlags(checkedComboBoxEdit1.Properties);
// Set an initial value.
checkedComboBoxEdit1.SetEditValue(MyColors.Black | MyColors.Green);
}
// Traverse through items and remove those that correspond to bitwise combinations of simple flags.
private void removeCombinedFlags(RepositoryItemCheckedComboBoxEdit ri) {
for (int i = ri.Items.Count - 1; i > 0; i--) {
Enum val1 = ri.Items[i].Value as Enum;
for (int j = i - 1; j >= 0; j--) {
Enum val2 = ri.Items[j].Value as Enum;
if (val1.HasFlag(val2)) {
ri.Items.RemoveAt(i);
break;
}
}
}
}
}