封装访问配置文件类

需要用到的包：

Microsoft.Extensions.Configuration.Json：负责加载 JSON 配置文件，解析其中的内容。

Microsoft.Extensions.Configuration.Binder：负责将解析的配置数据绑定到实体

public class AppSettings
{
    public static IConfiguration Configuration { get; set; }

    public AppSettings(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public AppSettings(string basePath)
    {
        string path = "appsettings.json";
        Configuration = new ConfigurationBuilder()
            .SetBasePath(basePath)
            .Add(new JsonConfigurationSource
            {
                Path = path,
                Optional = false,
                ReloadOnChange = true
            })
            .Build();
    }

    public static string AppString(params string[] paras)
    {
        if (paras.Length != 0)
        {
            return Configuration[string.Join(":", paras)];
        }
        return string.Empty;
    }

    public static T AppEntity<T>(params string[] paras)
    {
        return Configuration.GetSection(string.Join(":", paras)).Get<T>();
    }

    public static List<T> AppEntitys<T>(params string[] paras)
    {
        return Configuration.GetSection(string.Join(":", paras)).Get<List<T>>();
    }

    public static List<KeyValuePair<string, string>> AppKeys(params string[] paras)
    {
        return Configuration.GetSection(string.Join(":", paras))
            .GetChildren().Select(x => new KeyValuePair<string, string>(x.Key, x.Value)).ToList();
    }
}

注入：program.cs里面

            builder.Services.AddSingleton(new AppSettings(builder.Configuration));

使用：

AppSettings.AppString("AppConfig:ApiName");