MenuItem绑定到形状类型的枚举，但仅显示最后一个枚举项的形状

分类：编程问答

如何解决MenuItem绑定到形状类型的枚举，但仅显示最后一个枚举项的形状

一个类由一个枚举和一个转换器组成，该转换器的工作是将枚举值转换为几何。可以在下面看到：

public enum GeometryEnum
{
    Triangle,Rectangle,RoundedRectangle,Diamond,Pentagonal,Hexagonal,Heptagonal,Octagonal,Decagonal,Ellipse,Star5,Star6,Star7,Star8,Star10
}

public class EnumToGeometryConverter : IValueConverter
{
    public object Convert(object value,Type targetType,object parameter,CultureInfo culture)
    {
        GeometryEnum _enumGeometry;
        if (value != null)
            _enumGeometry = (GeometryEnum)Enum.Parse(typeof(GeometryEnum),value.ToString());
        else if (parameter != null)
            _enumGeometry = (GeometryEnum)Enum.Parse(typeof(GeometryEnum),parameter.ToString());
        else
            return null;
        switch (_enumGeometry)
        {
            case GeometryEnum.Triangle: return Geometry.Parse("M0.5,0 1,1 0,1 Z");
            case GeometryEnum.Ellipse: return new EllipseGeometry(new System.Windows.Point(0.5,0.5),0.5,0.5);
            case GeometryEnum.Rectangle: return new RectangleGeometry(new System.Windows.Rect(new System.Windows.Size(1,1)));
            case GeometryEnum.RoundedRectangle: return new RectangleGeometry(new System.Windows.Rect(new System.Windows.Size(1,1)),0.1d,0.1d);
        }
        return null;
    }

    public object ConvertBack(object value,CultureInfo culture)
    {
        return null;
    }
}

我想使用此转换器将每个枚举值转换为其等效的几何形状。我在程序的其他部分使用此转换没有任何问题。 但是当我在菜单项的Icon属性中使用它时，我看到只有最后一个菜单项具有Icon，其他菜单项都为空。

在xaml文件中，菜单项的代码如下：

 <ObjectDataProvider x:Key="DataGeometryTypeEnum" MethodName="GetValues"
                        ObjectType="{x:Type System:Enum}">
    <ObjectDataProvider.MethodParameters>
        <x:Type TypeName="classes:GeometryEnum"/>
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>


    <MenuItem Header="Shape Type" Command="{x:Static tndcontrols:TndGraphCanvas.ComboBoxShapeRoutedCommand}"
              ItemsSource="{Binding Source={StaticResource DataGeometryTypeEnum}}"
              >
        <MenuItem.ItemContainerStyle>
            <Style TargetType="{x:Type MenuItem}">
                <Setter Property="Command" Value="{x:Static tndcontrols:TndGraphCanvas.ComboBoxShapeRoutedCommand}" />
                <Setter Property="CommandParameter" Value="{Binding}" />
                <Setter Property="Icon">
                    <Setter.Value>
                        <Image Width="16" Height="16">
                            <Image.Source>
                                <DrawingImage>
                                    <DrawingImage.Drawing>
                                        <GeometryDrawing Brush="#FF466280" Geometry="{Binding Converter={StaticResource EnumToGeometryConverter}}">
                                            <GeometryDrawing.Pen>
                                                <Pen Thickness="1" Brush="#FF212121"/>
                                            </GeometryDrawing.Pen>
                                        </GeometryDrawing>
                                    </DrawingImage.Drawing>
                                </DrawingImage>
                            </Image.Source>
                        </Image>
                    </Setter.Value>
                </Setter>
            </Style>
        </MenuItem.ItemContainerStyle>
        <MenuItem.Icon>
            <Image Source="Images/Icons/Shapes.ico" Width="16" Height="16"/>
        </MenuItem.Icon>
    </MenuItem>

enter image description here

解决方法

我经常使用字典转换器。 它提供了各种值的通用转换。 我认为这将适合您解决问题：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Windows.Data;

namespace Common
{
    /// <summary>A converter that converts a key to a dictionary value.</summary>
    public class DictionaryKeyToValueConverter : Dictionary<object,object>,IMultiValueConverter,IValueConverter
    {
        // The first element in the values parameter comes the key,the second - the dictionary.
        public object Convert(object[] values,Type targetType,object parameter,CultureInfo culture)
        {
            // If only the key is received,the converter dictionary is used.
            if (values.Length == 1)
            {

                if (TryGetValue(values[0],out object val))
                    return val;

            }
            // If more than one element came,then the key is extracted from the first,and the dictionary from the second.
            else if (values.Length > 1 && (values[1] is IDictionary dictionary) && (dictionary.Contains(values[0])))
            {
                return dictionary[values[0]];
            }
            return null;
        }

        // The dictionary key should come in the value parameter.
        public object Convert(object value,CultureInfo culture)
        {
            if (TryGetValue(value,out object val))
                return val;

            return null;
        }

        public object[] ConvertBack(object value,Type[] targetTypes,CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        public object ConvertBack(object value,CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

示例：

<Window x:Class="IconsMenu.IconMenuWind"
        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:IconsMenu"
        xmlns:System="clr-namespace:System;assembly=mscorlib" xmlns:comm="clr-namespace:Common"
        mc:Ignorable="d"
        Title="IconMenuWind" Height="450" Width="800">
    <Window.Resources>
        <ObjectDataProvider x:Key="DataGeometryTypeEnum" MethodName="GetValues"
                        ObjectType="{x:Type System:Enum}">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="local:GeometryEnum"/>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <comm:DictionaryKeyToValueConverter x:Key="EnumToImageConverter">
            <DrawingImage x:Key="{x:Static local:GeometryEnum.Triangle}">
                <DrawingImage.Drawing>
                    <GeometryDrawing Brush="#FF466280" Geometry="M 0.5 0 1,1 0,1 Z">
                        <GeometryDrawing.Pen>
                            <Pen Thickness="1" Brush="#FF212121"/>
                        </GeometryDrawing.Pen>
                    </GeometryDrawing>
                </DrawingImage.Drawing>
            </DrawingImage>
            <DrawingImage x:Key="{x:Static local:GeometryEnum.Ellipse}">
                <DrawingImage.Drawing>
                    <GeometryDrawing Brush="#FF466280">
                        <GeometryDrawing.Geometry>
                            <EllipseGeometry Center="0.5 0.5" RadiusX="0.5" RadiusY="0.5"/>
                        </GeometryDrawing.Geometry>
                        <GeometryDrawing.Pen>
                            <Pen Thickness="1" Brush="#FF212121"/>
                        </GeometryDrawing.Pen>
                    </GeometryDrawing>
                </DrawingImage.Drawing>
            </DrawingImage>
            <DrawingImage x:Key="{x:Static local:GeometryEnum.Rectangle}">
                <DrawingImage.Drawing>
                    <GeometryDrawing Brush="#FF466280">
                        <GeometryDrawing.Geometry>
                            <RectangleGeometry Rect="0,1,1"/>
                        </GeometryDrawing.Geometry>
                        <GeometryDrawing.Pen>
                            <Pen Thickness="1" Brush="#FF212121"/>
                        </GeometryDrawing.Pen>
                    </GeometryDrawing>
                </DrawingImage.Drawing>
            </DrawingImage>
            <DrawingImage x:Key="{x:Static local:GeometryEnum.RoundedRectangle}">
                <DrawingImage.Drawing>
                    <GeometryDrawing Brush="#FF466280">
                        <GeometryDrawing.Geometry>
                            <RectangleGeometry Rect="0,1" RadiusX="0.1" RadiusY="0.1"/>
                        </GeometryDrawing.Geometry>
                        <GeometryDrawing.Pen>
                            <Pen Thickness="1" Brush="#FF212121"/>
                        </GeometryDrawing.Pen>
                    </GeometryDrawing>
                </DrawingImage.Drawing>
            </DrawingImage>
        </comm:DictionaryKeyToValueConverter>
    </Window.Resources>
    <Grid>
        <ListBox ItemsSource="{Binding Mode=OneWay,Source={StaticResource DataGeometryTypeEnum}}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid x:Name="grid">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="{Binding ActualHeight,ElementName=grid,Mode=OneWay}"/>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <Image Source="{Binding Converter={StaticResource EnumToImageConverter},Mode=OneWay}"/>
                        <TextBlock Text="{Binding}" Grid.Column="1"/>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

或者像这样：

<Window.Resources>
    <ObjectDataProvider x:Key="DataGeometryTypeEnum" MethodName="GetValues"
                        ObjectType="{x:Type System:Enum}">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:GeometryEnum"/>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <comm:DictionaryKeyToValueConverter x:Key="EnumToImageConverter">
        <Geometry x:Key="{x:Static local:GeometryEnum.Triangle}">M 0.5 0 1,1 Z</Geometry>
        <EllipseGeometry x:Key="{x:Static local:GeometryEnum.Ellipse}" Center="0.5 0.5" RadiusX="0.5" RadiusY="0.5"/>
        <RectangleGeometry x:Key="{x:Static local:GeometryEnum.Rectangle}" Rect="0,1"/>
        <RectangleGeometry x:Key="{x:Static local:GeometryEnum.RoundedRectangle}" Rect="0,1" RadiusX="0.1" RadiusY="0.1"/>
    </comm:DictionaryKeyToValueConverter>
</Window.Resources>
<Grid>
    <ListBox ItemsSource="{Binding Mode=OneWay,Source={StaticResource DataGeometryTypeEnum}}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid x:Name="grid">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="{Binding ActualHeight,Mode=OneWay}"/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image>
                        <Image.Source>
                            <DrawingImage>
                                <DrawingImage.Drawing>
                                    <GeometryDrawing Brush="#FF466280" Geometry="{Binding Converter={StaticResource EnumToImageConverter},Mode=OneWay}" >
                                        <GeometryDrawing.Pen>
                                            <Pen Thickness="1" Brush="#FF212121"/>
                                        </GeometryDrawing.Pen>
                                    </GeometryDrawing>
                                </DrawingImage.Drawing>
                            </DrawingImage>
                        </Image.Source>
                    </Image>
                    <TextBlock Text="{Binding}" Grid.Column="1"/>
                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

使用多个转换器实例与多个枚举一起使用的示例。

添加的枚举：

public enum ColorsEnum
{
    Black,Green
}

XAML：

<Window.Resources>
    <ObjectDataProvider x:Key="DataGeometryTypeEnum" MethodName="GetValues"
                        ObjectType="{x:Type System:Enum}">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:GeometryEnum"/>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <ObjectDataProvider x:Key="DataColorsTypeEnum" MethodName="GetValues"
                        ObjectType="{x:Type System:Enum}">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:ColorsEnum"/>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>

    <comm:DictionaryKeyToValueConverter x:Key="DictionaryConverter">
        <Geometry x:Key="{x:Static local:GeometryEnum.Triangle}">M 0.5 0 1,1" RadiusX="0.1" RadiusY="0.1"/>
        <SolidColorBrush x:Key="{x:Static local:ColorsEnum.Black}" Color="Black"/>
        <SolidColorBrush x:Key="{x:Static local:ColorsEnum.Green}" Color="Green"/>
    </comm:DictionaryKeyToValueConverter>
    <comm:DictionaryKeyToValueConverter x:Key="ForegroundConverter">
        <SolidColorBrush x:Key="{x:Static local:GeometryEnum.Triangle}" Color="Gray" />
        <SolidColorBrush x:Key="{x:Static local:GeometryEnum.Ellipse}" Color="Green"/>
        <SolidColorBrush x:Key="{x:Static local:GeometryEnum.Rectangle}" Color="Blue"/>
        <SolidColorBrush x:Key="{x:Static local:GeometryEnum.RoundedRectangle}" Color="Coral"/>
        <SolidColorBrush x:Key="{x:Static local:ColorsEnum.Black}" Color="LightGray"/>
        <SolidColorBrush x:Key="{x:Static local:ColorsEnum.Green}" Color="Yellow"/>
    </comm:DictionaryKeyToValueConverter>
</Window.Resources>
<Grid>
    <ListBox ItemsSource="{Binding Mode=OneWay,Source={StaticResource DataGeometryTypeEnum}}"
             HorizontalAlignment="Left">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid x:Name="grid">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="{Binding ActualHeight,Mode=OneWay}"/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Image>
                        <Image.Source>
                            <DrawingImage>
                                <DrawingImage.Drawing>
                                    <GeometryDrawing Brush="#FF466280"
                                                     Geometry="{Binding Converter={StaticResource DictionaryConverter},Mode=OneWay}" >
                                        <GeometryDrawing.Pen>
                                            <Pen Thickness="1" Brush="{Binding Converter={StaticResource ForegroundConverter}}"/>
                                        </GeometryDrawing.Pen>
                                    </GeometryDrawing>
                                </DrawingImage.Drawing>
                            </DrawingImage>
                        </Image.Source>
                    </Image>
                    <TextBlock Text="{Binding}" Grid.Column="1"/>
                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
    <ListBox ItemsSource="{Binding Mode=OneWay,Source={StaticResource DataColorsTypeEnum}}" HorizontalAlignment="Center">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding}"
                           Background="{Binding Converter={StaticResource DictionaryConverter}}"
                           Foreground="{Binding Converter={StaticResource ForegroundConverter}}"/>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
    <ListBox ItemsSource="{Binding Keys,Source={StaticResource DictionaryConverter}}" HorizontalAlignment="Right"/>
</Grid>

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