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

巴特西

WPF中向下拉框中绑定枚举体

方法二：使用EnumerationExtension

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