我正在嘗試使用MultiBinding來更新DataGridTextColumn。MultiBinding無法在DataGridTextColumn中工作
<Window x:Class="WPFBench.MultiBindingProblem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WPFBench"
mc:Ignorable="d"
Title="MultiBindingProblem" Height="300" Width="300">
<Window.Resources>
<local:MultiValueConverter x:Key="MultiValueConverter"/>
</Window.Resources>
<Grid>
<DataGrid x:Name="dataGrid" AutoGenerateColumns="False"
ItemsSource="{Binding TableA}" ColumnWidth="100*">
<DataGrid.Columns>
<DataGridTextColumn Header="Value" Binding="{Binding Value}"/>
<DataGridTextColumn Header="MultiValue">
<DataGridTextColumn.Binding>
<MultiBinding Converter="{StaticResource MultiValueConverter}">
<Binding Path="Value"/>
<Binding Path="Value"/>
</MultiBinding>
</DataGridTextColumn.Binding>
</DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
這裏是轉換器...
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
namespace WPFBench
{
public class MultiValueConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
return values[0];
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
後面的代碼...
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Shapes;
namespace WPFBench
{
/// <summary>
/// Interaction logic for MultiBindingProblem.xaml
/// </summary>
public partial class MultiBindingProblem : Window
{
DataTable _tableA = new DataTable();
public MultiBindingProblem()
{
InitializeComponent();
_tableA.Columns.Add(new DataColumn("Value", typeof(double)));
_tableA.Rows.Add(0.0);
_tableA.Rows.Add(1.0);
_tableA.Rows.Add(2.0);
_tableA.Rows.Add(3.0);
_tableA.Rows.Add(4.0);
DataContext = this;
}
public DataTable TableA
{
get { return _tableA; }
}
}
}
單綁定列被更新。多值轉換器被調用。多值列保持空白。我究竟做錯了什麼?
你是否約束所有相同的事情? – Noctis