1.//首先引入SqlSugarCore包
2.//新建SqlsugarSetup类

 public static class SqlsugarSetup
    {
        public static void AddSqlsugarSetup(this IServiceCollection services, IConfiguration configuration,
         string dbName = "ConnectString")
        {
            SqlSugarScope sqlSugar = new SqlSugarScope(new ConnectionConfig()
            {
               //如果是mysql，换成SqlSugar.DbType.MySql
                DbType = SqlSugar.DbType.SqlServer,
                ConnectionString = configuration[dbName],
                IsAutoCloseConnection = true,
            },
                db =>
                {
                    //单例参数配置，所有上下文生效       
                    db.Aop.OnLogExecuting = (sql, pars) =>
                    {
                        Console.WriteLine(sql);//输出sql
                    };
                });
            services.AddSingleton<ISqlSugarClient>(sqlSugar);//这边是SqlSugarScope用AddSingleton
        }
    }

3.//在appsettings添加连接字符串

  "ConnectString": "Server=.;Database=db;User=sa;Password=123456;"

4.//在Program注入SqlsugarSetup类

builder.Services.AddSqlsugarSetup(builder.Configuration);

5.//在方法中依赖注入

        private readonly ISqlSugarClient _SqlSugarDB;
        /// <summary>
        /// 依赖注入
        /// </summary>
        public AnsweringQuestionService(ISqlSugarClient SqlSugarDB)
        {
            _SqlSugarDB = SqlSugarDB;
        }

6.使用SqlSugar增删改查

//查询
var a = _SqlSugarDB.Queryable<UserInfo>().ToList();
var b = _SqlSugarDB.Queryable<UserInfo>().Where(a => a.UserID == "1").ToList();
//插入
var res =_SqlSugarDB.Insertable<UserInfo>(new UserInfo() { UserName = "LiuHG", Password = "123456", Role = 1 }).ExecuteCommand();
//更新
var res =_SqlSugarDB.Updateable(new UserInfo() { Id = 1, UserName = "lhg", Role = 2, Password = "123456" }).ExecuteCommand();
//删除
var res =_SqlSugarDB.Deleteable<UserInfo>().Where(it => it.Id == 1).ExecuteCommand();