时间:2017-08-03 21:19:25

标签: c# wpf combobox datagrid datagridtemplatecolumn

我的DataGrid包含3个数字参数和颜色的图形对象列表(抛物线)(类型为br的{​​{1}}属性)。

我想从放置在SolidColorBrush中的ComboBox中选择颜色,以便将所选类型(DataGridTemplateColumn)的值保存在DataGrid中所选项目的SolidColorBrush属性中。

图片显示了主窗口的工作原理:

Main window working

创建新项目时,它会自动添加到DataGrid,但DataGrid中的br列不会显示其颜色。在代码中以编程方式设置Color值时,ComboBox也不会更新。

当我从下拉列表中手动选择颜色值时,它不会保存在所选项目的br属性中。

在这种情况下,如何正确组织数据绑定?

我的简单图形元素类:

br

主窗口代码:

using System;
using System.Windows.Media;
using System.Reflection;
using System.ComponentModel;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfParabola
{
    public class Parabola
    {
        public double a { get; set; } = 1;
        public double b { get; set; } = 1;
        public double c { get; set; } = 1;
        public SolidColorBrush br { get; set; } = new SolidColorBrush(Colors.Black);
        PropertyInfo[] brushes = typeof(Brushes).GetProperties();

        public Parabola() { }
        public Parabola(Random rnd)
        {
            a = (double)rnd.Next(2, 20) / 100;
            b = (double)rnd.Next(2, 20) / 100;
            c = (double)rnd.Next(1, 30);
            int random = rnd.Next(brushes.Length);
            br = (SolidColorBrush)brushes[random].GetValue(null, null);
        }
        public Parabola(double _a, double _b, double _c)
        {
            a = _a;
            b = _b;
            c = _c;
        }
        public double y(double x)
        {
            return Math.Pow(a * x, 2) + b * x + c;
        }
    }
}

及其背后的代码:

<Window x:Class="WpfParabola.MainWindow"
    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:WpfParabola"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="725"
    x:Name="_this">
<Window.Resources>
    <ResourceDictionary>
        <ObjectDataProvider MethodName="GetType"
ObjectType="{x:Type sys:Type}" x:Key="colorsTypeOdp">
            <ObjectDataProvider.MethodParameters>
                <sys:String>System.Windows.Media.Colors, PresentationCore,
        Version=3.0.0.0, Culture=neutral,
        PublicKeyToken=31bf3856ad364e35</sys:String>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <ObjectDataProvider ObjectInstance="{StaticResource colorsTypeOdp}"
MethodName="GetProperties" x:Key="colorPropertiesOdp">
        </ObjectDataProvider>
    </ResourceDictionary>
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="300"></ColumnDefinition>
        <ColumnDefinition Width="*"></ColumnDefinition>
    </Grid.ColumnDefinitions>
    <DataGrid Grid.Row="0"
              Grid.Column="0"
              Name="parabolasDataGrid"
              CanUserAddRows="False"
              ItemsSource="{Binding parabolas}">
        <DataGrid.Columns>
            <DataGridTextColumn Header="a" Width="20" Binding="{Binding a}"></DataGridTextColumn>
            <DataGridTextColumn Header="b" Width="20" Binding="{Binding b}"></DataGridTextColumn>
            <DataGridTextColumn Header="c" Width="20" Binding="{Binding c}"></DataGridTextColumn>
            <DataGridTemplateColumn Header="Color" Width="150">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox ItemsSource="{Binding Source={StaticResource colorPropertiesOdp}}"
                                  SelectedItem ="{Binding br}">
                            <ComboBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Width="50" Height="{Binding ElementName=FontSize+4}" Margin="2" Background="{Binding Name}"/>
                                        <TextBlock  TextAlignment="Left" VerticalAlignment="Center" Text="{Binding Name}"/>
                                    </StackPanel>
                                </DataTemplate>
                            </ComboBox.ItemTemplate>
                        </ComboBox>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>
    <Canvas Grid.Row="0" Grid.Column="1" Name="parabolaCanvas"></Canvas>
    <StackPanel Grid.Row="1" Grid.Column="1">
        <Button Padding="3" Margin="3" Click="Button_Click">Add parabola</Button>
        <Button Padding="3" Margin="3" IsCancel="True" Click="Button_Click_1">Close</Button>
    </StackPanel>
</Grid>

1 个答案:

答案 0 :(得分:1)

所以你有一组抛物线,你绑定你的集合,但你不能将你的ComboBox上的SelectedItem绑定到你的变量BR。您还需要使用NotifyPropertyChanged,以便在选择其他颜色时更新网格。