如何在ASP.NET Core MVC中强类型获取嵌套appSettings值？

你遇到的配置绑定失败问题，主要源于配置节点路径不匹配和键名拼写错误两个核心问题，以下是具体修复步骤：

1. 修正配置键名拼写错误 #

你的配置文件中存在拼写错误：

"InformtionId": "123" // 少了字母r

而你的TeamSettings类属性名是InformationId，两者不匹配导致绑定失败。将配置中的键名修正为：

"InformationId": "123"

2. 修正配置节点路径 #

你的配置中，TeamSettings对应的实际节点路径是：
CustomSite:Management:ThirdParty:Results:Team:Settings
但你注册时最后一步用了nameof(TeamSettings)，而配置里的节点名是Settings，并非TeamSettings，导致路径指向错误。

正确的注册代码（二选一） #

链式GetSection写法：

Services.Configure<TeamSettings>(builder.Configuration
    .GetSection("CustomSite")
    .GetSection("Management")
    .GetSection("ThirdParty")
    .GetSection("Results")
    .GetSection("Team")
    .GetSection("Settings"));

简洁路径字符串写法：

Services.Configure<TeamSettings>(builder.Configuration.GetSection("CustomSite:Management:ThirdParty:Results:Team:Settings"));

3. 验证依赖注入使用方式 #

确保你通过构造函数正确注入IOptions<TeamSettings>，而非手动实例化：

public class YourController
{
    private readonly TeamSettings _teamSettings;

    public YourController(IOptions<TeamSettings> teamSettings)
    {
        _teamSettings = teamSettings.Value;
    }

    public IActionResult Index()
    {
        var infoId = _teamSettings.InformationId; // 现在能正常获取值
        var adminKey = _teamSettings.AdminKey;
        return View();
    }
}

可选优化：完整配置层级类（适合复杂结构） #

如果你的配置结构复杂，可以创建完整的层级类，让配置绑定更清晰：

public class CustomSiteSettings
{
    public ManagementSettings Management { get; set; } = new();
}

public class ManagementSettings
{
    public ConfinedSettings Confined { get; set; } = new();
    public ThirdPartySettings ThirdParty { get; set; } = new();
}

public class ThirdPartySettings
{
    public ResultsSettings Results { get; set; } = new();
}

public class ResultsSettings
{
    public TeamSettingsContainer Team { get; set; } = new();
}

public class TeamSettingsContainer
{
    public TeamSettings Settings { get; set; } = new();
}

public class TeamSettings
{
    public string? InformationId { get; set; } = string.Empty;
    public string AdminKey { get; set; } = string.Empty;
}

注册时绑定整个根节点：

Services.Configure<CustomSiteSettings>(builder.Configuration.GetSection("CustomSite"));

使用时通过层级访问：

public YourController(IOptions<CustomSiteSettings> siteSettings)
{
    var teamSettings = siteSettings.Value.Management.ThirdParty.Results.Team.Settings;
}

内容的提问来源于stack exchange，提问作者KeithViking