.Net 6中将appsettings.json配置项注入到services层

namespace Entity.Common
{
    /// <summary>
    /// 生源费审核设置
    /// </summary>
    public class SalarySyOptions
    {
        public int SalaryItemId { get; set; }//生源费项目ID
    }
}

{
 "SalarySy": {
    "SalaryItemId": "38" //生源费id
  },
  "Salary": {
    "Upondate": "2021-12-01 00:00:00" //绩效工资生效日期
  },
  "AllowedHosts": "*"
}

public static void AddCustomServices(this IServiceCollection Services,IConfiguration configuration)
 {
            Services.AddOptions();
            Services.Configure<SalarySyOptions>(configuration.GetSection("SalarySy"));//添加生源费审核salaryitemid配置，读取appsetting.json文件
            Services.Configure<SalaryOptions>(configuration.GetSection("Salary"));//添加绩效工资生效日期配置。
}
这个类是builder.Services的扩展方法，在program.cs中加入下面代码即可
builder.Services.AddCustomServices(builder.Configuration);//添加用户服务注入（扩展方法）

namespace Services
{
    public class AuditSyService
    {
        private readonly IRepository<ModelAudit3> _audit3;
        private readonly SalarySyOptions _salarysyoptions;//生源费审核配置注入

        public AuditSyService(IRepository<ModelSalarySy> salarySys,IRepository<ModelAudit3>audit3,IOptions<SalarySyOptions>salarysyoptions)
        {
            _audit3 = audit3;
            _salarysyoptions = salarysyoptions.Value;
        }

        /// <summary>
        /// 新增生源费审核记录
        /// </summary>
        /// <param name="stuid">学员id</param>
        /// <param name="enroll_id">招生人id</param>
        /// <param name="salaryitemid">工资标准id</param>
        /// <param name="userid">操作用户id</param>
        /// <param name="username">操作用户名称</param>
        /// <returns></returns>
        public int AddSalarySy(int stuid, int enroll_id,int userid,string username)
        {
            return _audit3.Add(new ModelAudit3 { StuId=stuid,Enroll_id=enroll_id,SalaryItemId=_salarysyoptions.SalaryItemId,Sdate=DateTime.Now,UserId=userid,Optman=username});
        }
    }
}