GridCellValidationEventArgs.CellValue Property
Gets the cell’s old valid value.
Namespace: DevExpress.Xpf.Grid
Assembly: DevExpress.Xpf.Grid.v20.2.dll
NuGet Packages: DevExpress.WindowsDesktop.Wpf.Grid.Core, DevExpress.Wpf.Grid.Core
Declaration
Property Value
Type | Description |
---|---|
Object | An object that represents the cell’s old valid value. |
Remarks
When handling the GridColumn.Validate event, the cell’s curernt value isn’t saved to a data source until it is validated. The event parameter’s CellValue property returns the cell’s old valid value. The current value which is being validated is returned by the event parameter’s Value property.
Example
This example shows how to validate the focused cell's value. In this example, the product's price can be reduced by 30% if the product is discontinued.
<Window x:Class="DXGrid_ValidatingEditors.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
Title="Window1" Height="300" Width="600">
<Grid>
<dxg:GridControl x:Name="grid" ItemsSource="{Binding ProductList}">
<dxg:GridControl.Columns>
<dxg:GridColumn FieldName="ProductName">
<dxg:GridColumn.EditSettings>
<dxe:TextEditSettings AllowNullInput="False" />
</dxg:GridColumn.EditSettings>
</dxg:GridColumn>
<dxg:GridColumn FieldName="UnitPrice" Validate="GridColumn_Validate">
<dxg:GridColumn.EditSettings>
<dxe:SpinEditSettings DisplayFormat="c2" />
</dxg:GridColumn.EditSettings>
</dxg:GridColumn>
<dxg:GridColumn FieldName="Discontinued" />
</dxg:GridControl.Columns>
<dxg:GridControl.View>
<dxg:TableView AutoWidth="True" HiddenEditor="TableView_HiddenEditor" />
</dxg:GridControl.View>
</dxg:GridControl>
</Grid>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data;
using DevExpress.Xpf.Grid;
using System.Collections.ObjectModel;
namespace DXGrid_ValidatingEditors {
public partial class Window1 : Window {
public Window1() {
InitializeComponent();
this.DataContext = new MyViewModel();
}
private void GridColumn_Validate(object sender, GridCellValidationEventArgs e) {
bool discontinued = ((Product)e.Row).Discontinued;
if (discontinued) {
double discount = 100 - (Convert.ToDouble(e.Value) * 100) /
Convert.ToDouble(e.CellValue);
if (!(discount > 0 && discount <= 30)) {
e.IsValid = false;
e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Critical;
if (discount < 0) {
e.ErrorContent = string.Format("The price cannot be greater than ${0}",
Convert.ToDouble(e.CellValue));
return;
}
e.ErrorContent = string.Format(
"The discount cannot be greater than 30% (${0}). Please correct the price.",
Convert.ToDouble(e.CellValue)*0.7);
}
}
}
private void TableView_HiddenEditor(object sender, EditorEventArgs e) {
if (e.Column.FieldName != "Discontinued") return;
grid.View.CommitEditing();
}
}
public class MyViewModel {
public MyViewModel() {
CreateList();
}
public ObservableCollection<Product> ProductList { get; set; }
void CreateList() {
ProductList = new ObservableCollection<Product>();
Random r = new Random();
for (int i = 0; i < 20; i++) {
Product p = new Product(i);
p.UnitPrice = r.Next(1, 50);
ProductList.Add(p);
}
}
}
public class Product {
public Product(int i) {
ProductName = "Product" + i;
Discontinued = i % 5 == 0;
}
public string ProductName { get; set; }
public int UnitPrice { get; set; }
public bool Discontinued { get; set; }
}
}
Related GitHub Examples
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the CellValue property.
Note
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