RepositoryItemDateEdit.NullDate Property
Gets or sets a value that is interpreted as the null date.
Namespace: DevExpress.XtraEditors.Repository
Assembly: DevExpress.XtraEditors.v24.2.dll
Declaration
[DefaultValue(null)]
[DXCategory("Behavior")]
public virtual object NullDate { get; set; }
Property Value
Type | Default | Description |
---|---|---|
Object | null | A value interpreted as the null date. |
Remarks
The DateEdit.DateTime property (which is of the DateTime
type) is in sync with the DateEdit.EditValue
property (which is of the Object
type).
When you set the DateTime
property, the same value is assigned to the EditValue
property. When you assign a value to the EditValue
property, this value is converted to the DateTime
type and assigned to the DateTime
property.
When the EditValue
property is set to null or any object that cannot be converted to a valid DateTime value, the editor’s DateTime
property is set to a null date. By default, the null date is equal to DateTime.MinValue
. Use the NullDate
property to specify a custom null date.
When the editor’s EditValue
property is set to null, DBNull, or NullDate (provided that NullDate
is set to a non-default value), the editor displays the string specified by the RepositoryItem.NullText property (an empty string by default).
Note
The NullDate
property is not supported when a DateEdit control is bound to a data source and the DataSourceUpdateMode.OnPropertyChanged
flag is set in the corresponding Binding object.
Example
The following example displays <empty> in grid cells with DBNull values:
using System;
using System.ComponentModel;
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Columns;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraEditors.Repository;
namespace DXApplication {
public partial class Form1 : DevExpress.XtraEditors.XtraForm {
RepositoryItemDateEdit dateEditor;
public Form1() {
InitializeComponent();
InitGridControl(gridControl1);
// Bind the GridControl to runtime created data.
gridControl1.DataSource = new BindingList<DataItem>() {
new DataItem(){ Date = DateTime.Now },
new DataItem(){ Date = DBNull.Value },
new DataItem(){ Date = DBNull.Value }
};
}
void InitGridControl(GridControl grid) {
// Create and initialize the DateEdit repository item (a cell/in-place editor).
dateEditor = new RepositoryItemDateEdit() {
Name = "dateEditor",
NullDate = DBNull.Value,
NullText = "<empty>"
};
grid.RepositoryItems.Add(dateEditor);
// Create and initialize the 'Date' column.
GridColumn dateColumn = new GridColumn() {
Caption = "Date",
FieldName = "Date",
ColumnEdit = dateEditor,
Visible = true
};
(grid.MainView as GridView).Columns.Add(dateColumn);
}
}
public class DataItem {
public object Date { get; set; }
}
}