MVVM模式下如何用静态列表填充WPF ComboBox？

首先你之前绑定失败的核心原因：WPF的数据绑定只能访问公共（public）成员，你定义的private属性绑定引擎根本访问不到，所以会崩溃。下面给你几种不用写太多冗余代码的实现方式：

方式1：直接在XAML中定义静态集合（最简便，无需后台/ViewModel代码） #

把静态列表直接写在XAML的资源里，然后绑定到ComboBox的ItemsSource：

<!-- 先在Window根节点添加系统字符串命名空间 -->
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <!-- 定义语言列表 -->
        <x:Array x:Key="LanguageList" Type="sys:String">
            <sys:String>English</sys:String>
            <sys:String>Chinese</sys:String>
        </x:Array>
        <!-- 定义主题列表 -->
        <x:Array x:Key="ThemeList" Type="sys:String">
            <sys:String>Dark</sys:String>
            <sys:String>Light</sys:String>
        </x:Array>
        <!-- 定义颜色基底列表 -->
        <x:Array x:Key="ColourBaseList" Type="sys:String">
            <sys:String>Default</sys:String>
            <sys:String>Amber</sys:String>
            <sys:String>Blue</sys:String>
            <sys:String>BlueGrey</sys:String>
            <sys:String>Brown</sys:String>
            <sys:String>DeepOrange</sys:String>
            <sys:String>DeepPurple</sys:String>
            <sys:String>Green</sys:String>
            <sys:String>Indigo</sys:String>
            <sys:String>Orange</sys:String>
            <sys:String>Pink</sys:String>
            <sys:String>Purple</sys:String>
            <sys:String>Red</sys:String>
            <sys:String>Teal</sys:String>
        </x:Array>
    </Window.Resources>

    <StackPanel>
        <!-- 绑定ComboBox -->
        <ComboBox Name="LanguageCombobox" 
                  ItemsSource="{StaticResource LanguageList}" 
                  SelectedItem="{Binding Language}" />
        <ComboBox Name="ThemesCombobox" 
                  ItemsSource="{StaticResource ThemeList}" 
                  SelectedItem="{Binding Theme}" />
        <ComboBox Name="ColourBases2" 
                  ItemsSource="{StaticResource ColourBaseList}" />
    </StackPanel>
</Window>

方式2：ViewModel中定义公共只读属性（符合MVVM规范，代码量极小） #

如果列表需要在ViewModel中复用，或者你更倾向于把数据逻辑放在ViewModel里，只需要定义公共只读属性即可：

// MainWindowViewModel.cs
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

public class MainWindowViewModel : INotifyPropertyChanged
{
    // 静态只读列表，一次性定义无需修改
    public IReadOnlyList<string> Languages { get; } = new List<string> { "English", "Chinese" };
    public IReadOnlyList<string> Themes { get; } = new List<string> { "Dark", "Light" };
    public IReadOnlyList<string> ColourBasesTxt { get; } = new List<string> 
    { 
        "Default", "Amber", "Blue", "BlueGrey", "Brown",
        "DeepOrange", "DeepPurple", "Green", "Indigo", "Orange",
        "Pink", "Purple", "Red", "Teal"
    };

    // 选中项属性（需要实现INotifyPropertyChanged以支持双向绑定）
    private string _language;
    public string Language
    {
        get => _language;
        set { _language = value; OnPropertyChanged(); }
    }

    private string _theme;
    public string Theme
    {
        get => _theme;
        set { _theme = value; OnPropertyChanged(); }
    }

    // INotifyPropertyChanged标准实现
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

然后给Window设置DataContext并绑定：

// MainWindow.xaml.cs
public MainWindow()
{
    InitializeComponent();
    DataContext = new MainWindowViewModel();
}

<StackPanel>
    <ComboBox Name="LanguageCombobox" 
              ItemsSource="{Binding Languages}" 
              SelectedItem="{Binding Language}" />
    <ComboBox Name="ThemesCombobox" 
              ItemsSource="{Binding Themes}" 
              SelectedItem="{Binding Theme}" />
    <ComboBox Name="ColourBases2" 
              ItemsSource="{Binding ColourBasesTxt}" />
</StackPanel>

方式3：用静态类存放全局通用列表（适合多页面复用的场景） #

如果这个列表是整个应用都要用的通用选项（比如语言、主题），可以定义一个静态类统一管理：

// AppConstants.cs
using System.Collections.Generic;

public static class AppConstants
{
    public static readonly IReadOnlyList<string> Languages = new List<string> { "English", "Chinese" };
    public static readonly IReadOnlyList<string> Themes = new List<string> { "Dark", "Light" };
    public static readonly IReadOnlyList<string> ColourBases = new List<string> 
    { 
        "Default", "Amber", "Blue", "BlueGrey", "Brown",
        "DeepOrange", "DeepPurple", "Green", "Indigo", "Orange",
        "Pink", "Purple", "Red", "Teal"
    };
}

然后XAML绑定（先添加静态类所在的命名空间，假设类在YourApp.Constants下）：

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:constants="clr-namespace:YourApp.Constants">

    <ComboBox Name="LanguageCombobox" 
              ItemsSource="{x:Static constants:AppConstants.Languages}" 
              SelectedItem="{Binding Language}" />
</Window>

关于是否保留代码后台的问题 #

如果只是单纯给ComboBox赋值静态列表，不建议保留在代码后台——这不符合MVVM的分离原则，而且上面的几种方式都比后台直接赋值更优雅，也不会增加太多工作量。只有当列表需要和UI控件的生命周期强绑定（比如依赖控件的某些状态动态生成）时，才考虑放在代码后台，但这种场景很少。

内容的提问来源于stack exchange，提问作者jc508