我有一个DataGrid,它填充了一个暴露double
类型属性的类的实例。此属性显示在DataGrid中。我想实现自定义验证,如果此验证失败,我想将整个单元格着色为红色。我认为我已接近完成它的工作,但尚未完成,现在我很难过。
我的问题是我无法使条件(在验证失败时)格式化工作。结果是单元格在开始时正确着色,但是当我插入一个使得falidating函数返回false的值时,我得到通常的红色边框,白色背景单元格样式。
我该如何输入这种格式?
XAML代码:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<DataGrid x:Name="dg" ItemsSource="{Binding Data}">
<DataGrid.Resources>
<ControlTemplate x:Key="validationTemplate">
<DockPanel>
<AdornedElementPlaceholder/>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
</DockPanel>
</ControlTemplate>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Background" Value="Yellow"/>
<Setter Property="Validation.ErrorTemplate" Value="{StaticResource validationTemplate}"></Setter>
</Style>
</DataGrid.Resources>
</DataGrid>
</Window>
代码背后:
public partial class MainWindow : Window
{
...
private void DataGrid_AutoGeneratedColumns(object sender, EventArgs e)
{
foreach (DataGridTextColumn c in dg.Columns)
{
c.ElementStyle = (Style)dg.FindResource("s");
for (int i = 0; i < dg.Items.Count; i++)
{
DataGridRow row = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(i);
if (row == null) // May be virtualized, bring into view and try again.
{
dg.UpdateLayout();
dg.ScrollIntoView(dg.Items[i]);
row = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(i);
}
TextBlock tb = (TextBlock)c.GetCellContent(row);
Binding binding = BindingOperations.GetBinding(tb, TextBlock.TextProperty);
binding.ValidationRules.Clear();
binding.ValidationRules.Add(new VR());
}
}
}
}
public class VR : ValidationRule
{
public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
{
...
}
}
编辑:根据开发hedgehog的建议更新了XAML代码,但仍无效。
答案 0 :(得分:2)
您似乎错误地使用了ErrorTemplate。
看看这个:
<ControlTemplate x:Key="validationTemplate">
<DockPanel>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
<AdornedElementPlaceholder/>
</DockPanel>
</ControlTemplate>
<TextBox Name="textBox1" Width="50" FontSize="15"
Validation.ErrorTemplate="{StaticResource validationTemplate}"
Style="{StaticResource textBoxInError}"
Grid.Row="1" Grid.Column="1" Margin="2">
<TextBox.Text>
<Binding Path="Age" Source="{StaticResource ods}"
UpdateSourceTrigger="PropertyChanged" >
<Binding.ValidationRules>
<c:AgeRangeRule Min="21" Max="130"/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
Validation.ErrorTemplate将允许您装饰AdornedElementPlaceholder,在本例中为TextBox。
在示例中,我给了你一个红色!将被装饰到TextBox的左侧。
修改强>
我更改了您的代码以使其正常工作。
<Grid>
<DataGrid x:Name="dg" ItemsSource="{Binding Data}" PreparingCellForEdit="OnBeginningEdit">
<DataGrid.Resources>
<ControlTemplate x:Key="validationTemplate">
<DockPanel>
<AdornedElementPlaceholder/>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
</DockPanel>
</ControlTemplate>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Background" Value="Yellow"/>
<Setter Property="Validation.ErrorTemplate" Value="{StaticResource validationTemplate}"/>
</Style>
</DataGrid.Resources>
</DataGrid>
</Grid>
这是
背后的代码public partial class MainWindow : Window
{
public List<D> Data { get; set; }
public MainWindow()
{
Data = new List<D>();
Random r = new Random();
Data.Add(new D(r.NextDouble()));
Data.Add(new D(r.NextDouble()));
Data.Add(new D(r.NextDouble()));
InitializeComponent();
DataContext = this;
}
private void DataGrid_AutoGeneratedColumns(object sender, EventArgs e)
{
foreach (DataGridTextColumn c in dg.Columns)
{
c.EditingElementStyle = (Style)dg.FindResource("s");
}
}
private void OnBeginningEdit(object sender, DataGridPreparingCellForEditEventArgs e)
{
TextBox tbx = (TextBox)e.EditingElement;
Binding binding = BindingOperations.GetBinding(tbx, TextBox.TextProperty);
binding.ValidationRules.Clear();
binding.ValidationRules.Add(new VR());
}
}
看到你需要使用TextBoxes,当你在其中写一些东西时,然后点击它以触发验证。
试一试。它对我有用:)