WPF中向下拉框中绑定枚举体
1、枚举绑定combox的ItemsSource
ItemsSource绑定的是个集合值，要想枚举绑定ItemsSource，首先应该想到的是把枚举值变成集合。
方法一：使用资源里的ObjectDataProvider
如以下枚举
public enum PeopleEnum
{
中国人,
美国人,
英国人,
俄罗斯人
}
前端绑定：
<Window x:Class="ComboxTest.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:ComboxTest"
mc:Ignorable="d"
Title="MainWindow" Height="200" Width="300">
<Window.Resources>
<ObjectDataProvider x:Key="peopleEnum" MethodName="GetValues" ObjectType="{x:Type local:PeopleEnum}">
<ObjectDataProvider.MethodParameters>
<x:Type Type="local:PeopleEnum"/>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</Window.Resources>
<StackPanel>
<ComboBox Margin="6" IsReadOnly="True" SelectedIndex="0" ItemsSource="{Binding Source={StaticResource peopleEnum}}"
SelectedItem="{Binding People}"></ComboBox>
<Button Margin="6" Click="show_People">显示选择项</Button>
</StackPanel>
</Window>
后端代码：
public partial class MainWindow : Window,INotifyPropertyChanged
{
#region 属性改变事件
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
private PeopleEnum people;
public PeopleEnum People
{
get => people;
set { people = value; OnPropertyChanged("People"); }
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
}
private void show_People(object sender, RoutedEventArgs e)
{
MessageBox.Show(People.ToString());
}
}
方法二：使用EnumerationExtension
有时候公司对编码有要求，比如枚举不能用中文，中文需要写到Description里。
重写一下上面的例子：
public enum PeopleEnum
{
[Description("中国人")]
CHINESE,
[Description("美国人")]
AMERICAN,
[Description("英国人")]
ENGLISHMAN,
[Description("俄罗斯人")]
RUSSIAN
}
然后写个枚举拓展的类：
public class EnumerationExtension : MarkupExtension
{
private Type _enumType;
public EnumerationExtension(Type enumType)
{
if (enumType == null)
throw new ArgumentNullException("enumType");
EnumType = enumType;
}
public Type EnumType
{
get { return _enumType; }
private set
{
if (_enumType == value)
return;
var enumType = Nullable.GetUnderlyingType(value) ?? value;
if (enumType.IsEnum == false)
throw new ArgumentException("Type must be an Enum.");
_enumType = value;
}
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
var enumValues = Enum.GetValues(EnumType);
return (
from object enumValue in enumValues
select new EnumerationMember
{
Value = enumValue,
Description = GetDescription(enumValue)
}).ToArray();
}
private string GetDescription(object enumValue)
{
var descriptionAttribute = EnumType
.GetField(enumValue.ToString())
.GetCustomAttributes(typeof(DescriptionAttribute), false)
.FirstOrDefault() as DescriptionAttribute;
return descriptionAttribute != null
? descriptionAttribute.Description
: enumValue.ToString();
}
public class EnumerationMember
{
public string Description { get; set; }
public object Value { get; set; }
}
}
前端使用：
<ComboBox Grid.Row="0" Grid.Column="1" Margin="3" MinHeight="28"
ItemsSource="{Binding Source={local:Enumeration {x:Type local:PeopleEnum}}}"
DisplayMemberPath="Description" SelectedValue="{Binding People}" SelectedValuePath="Value">
</ComboBox>
这样写代码会简洁很多。
2、布尔值绑定combox的ItemsSource
思路是先有个对应布尔值的枚举，然后用转换器进行转换。
public enum BoolEnum
{
是,
否
}
public class BoolEnumConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if ((bool)value == true)
return BoolEnum.是;
else
return BoolEnum.否;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if ((BoolEnum)value == BoolEnum.是)
return true;
else
return false;
}
}
前端代码：
<Window x:Class="ComboxTest.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:ComboxTest"
mc:Ignorable="d"
Title="MainWindow" Height="200" Width="300">
<Window.Resources>
<ObjectDataProvider x:Key="boolEnum" MethodName="GetValues" ObjectType="{x:Type local:BoolEnum}">
<ObjectDataProvider.MethodParameters>
<x:Type Type="local:BoolEnum"/>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<local:BoolEnumConverter x:Key="boolEnumConverter" />
</Window.Resources>
<StackPanel>
<ComboBox IsReadOnly="True" Margin="6" SelectedIndex="0" ItemsSource="{Binding Source={StaticResource boolEnum}}"
SelectedItem="{Binding YesOrNo,Converter={StaticResource boolEnumConverter}}"></ComboBox>
<Button Margin="6" Click="show_result">显示选择项</Button>
</StackPanel>
</Window>
public partial class MainWindow : Window,INotifyPropertyChanged
{
#region 属性改变事件
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
private bool yesOrNo=true;
public bool YesOrNo
{
get => yesOrNo;
set { yesOrNo = value; OnPropertyChanged("YesOrNo"); }
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
}
private void show_result(object sender, RoutedEventArgs e)
{
MessageBox.Show(YesOrNo.ToString());
}
}
原文链接：https://blog.csdn.net/niuge8905/article/details/112647213
