如何将appsettings.json文件中的ConnectionString传递给.NET Core2.2中的类库项目

using Microsoft.Extensions.Configuration;

namespace YourLibraryNamespace
{
    public class AppSettings
    {
        private readonly IConfiguration _configuration;

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

        public string ConnectionString => _configuration.GetConnectionString("YourConnectionStringName");
    }
}

using YourLibraryNamespace;

namespace YourLibraryNamespace.Services
{
    public class YourService
    {
        private readonly AppSettings _appSettings;

        public YourService(AppSettings appSettings)
        {
            _appSettings = appSettings;
        }

        public void SomeMethod()
        {
            string connectionString = _appSettings.ConnectionString;
            // 使用ConnectionString进行数据库连接等操作
        }
    }
}

using Microsoft.Extensions.Configuration;
using YourLibraryNamespace;

public class Startup
{
    private readonly IConfiguration _configuration;

    public Startup(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton(new AppSettings(_configuration));
        // 其他服务的配置
    }

    // 其他方法和配置
}