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

标签：return,Description,object,value,public,中向,WPF,下拉框,enumType
来源： https://www.cnblogs.com/jyj666/p/16607309.html