我有一个Character类,其属性为Enum。我想让我的代码做的是根据我的角色的性别来切换图像(如果角色是男性=男性形象)。
我遇到问题的方法是如何正确访问并获取此枚举值。你看,我正在创建一个Character类型的ObservableCollection。然后我将此集合绑定到ComboBox,然后通过ItemTemplate显示DisplayMemberPath。
我相信我正在做所有绑定权限,但我没有在我的值转换器中正确访问Character Gender属性。
XAML:参考转换器&&组合框
xmlns:converters="clr-namespace:ImageViaGenderTest_2014"
Title="MainWindow" Height="350" Width="1004.932">
<Window.Resources>
<converters:GenderToIconFilenameConverter x:Key="IconConverter"/>
</Window.Resources>
<ComboBox x:Name="Character_ComboBox" HorizontalAlignment="Left" VerticalAlignment="Top" Width="328" Height="25">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Width="50" Text="{Binding Name}"/>
<TextBlock Width="50" Text="{Binding Level}"/>
<Image Source="{Binding Gender, Converter={StaticResource IconConverter}}"/>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
MainWindow中的Observable Collection设置
public ObservableCollection<Character> squad_members = new ObservableCollection<Character>();
public MainWindow()
{
InitializeComponent();
squad_members.Add(new Character() { Name = "john_snow_knows_nothing", Level = 8, _Gender = Gender.Male});
squad_members.Add(new Character() { Name = "Ygritt_gets_wrecked", Level = 4, _Gender = Gender.Female});
Binding comboBinding = new Binding();
comboBinding.Source = squad_members;
BindingOperations.SetBinding(Character_ComboBox, ComboBox.ItemsSourceProperty, comboBinding);
}
自定义值转换器类(我认为我错误地引用了性别枚举)错误区域:
[ValueConversion(typeof(Gender), typeof(Image))]
public class GenderToIconFilenameConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
switch ((Gender)value)
{
case Gender.Female:
return "character1.jpg";
case Gender.Male:
return "character2.jpg";
default:
return null;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
}
角色等级:
public class Character
{
public string Name { get; set; }
public int Level { get; set; }
public Gender _Gender { get; set; }
}
性别枚举:
public enum Gender
{
Male, Female
}
我是否错误地引用了我的角色性别枚举?或者还有别的我忘记了吗? 我也从这个问题得到了帮助: Bind Icon depending on Enum in WPF Treeview
答案 0 :(得分:2)
纯xaml中有一个解决方案
<ComboBox x:Name="Character_ComboBox"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Width="328"
Height="25">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Width="50"
Text="{Binding Name}" />
<TextBlock Width="50"
Text="{Binding Level}" />
<Image x:Name="gender" />
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Gender}"
Value="Female">
<Setter Property="Source"
TargetName="gender"
Value="character1.jpg" />
</DataTrigger>
<DataTrigger Binding="{Binding Gender}"
Value="Male">
<Setter Property="Source"
TargetName="gender"
Value="character2.jpg" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
这种方法不需要任何转换器,当您选择较少时,这会更有用。
这里发生的是我们在模板上指定了DataTrigger并检查了Gender属性的值,当它满足某些条件时,我们相应地设置了图像源。