Dapper

 原文地址：https://www.cnblogs.com/dotnet261010/category/1137015.html

 https://esofar.gitbooks.io/dapper-tutorial-cn/utilities/stored-procedure.html?q=

在安装的时候报错：

“Dapper”已拥有为“System.Data.SqlClient”定义的依赖项。

换一个低版本的dapper就可以了（当前.net framework版本是4.5）——install-package dapper -version 1.50.2

            #region 匿名类插入          
            IDbConnection connection = new SqlConnection(connStr);
            var result = connection.Execute("insert into [User] (UserId,UserName,Email,Address) values(@UserId,@UserName,@Email,@Address)", new { UserId = 3, UserName = "Cindy", Email = "376612827@qq.com", Address = "东京" });            
            #endregion

            #region 实体类插入           
            string sqlCommandText = "insert into [User](UserId,UserName,Email,Address) values(@UserId,@UserName,@Email,@Address)";
            using (IDbConnection connection = new SqlConnection(connStr))
            {
                User user = new User() { UserId = 4, UserName = "tim", Email = "78415155@qq.com", Address = "西京" };
                int result = connection.Execute(sqlCommandText, user);
                if (result > 0)
                {
                    MessageBox.Show("插入成功！");
                }
                else
                {
                    MessageBox.Show("插入失败！");
                }
            }
            #endregion

            #region 批量插入            
            string sqlCommandText = "insert into [User](UserId,UserName,Email,Address) values(@UserId,@UserName,@Email,@Address)";
            using (IDbConnection connection = new SqlConnection(connStr))
            {
                List<User> users = new List<User>() {
                new User { UserId=5,UserName="stephen",Email="step@qq.com",Address="益州"},
                new User { UserId=6,UserName="loly",Email="loly@qq.com",Address="荆州"},
                new User { UserId=7,UserName="gay",Email="gay@qq.com",Address="兖州"}
            };
                int result = connection.Execute(sqlCommandText, users);
                if (result > 0)
                {
                    MessageBox.Show("插入成功！");
                }
                else
                {
                    MessageBox.Show("插入失败！");
                }
            }
            #endregion

            using (IDbConnection connection = new SqlConnection(connStr))
            {
                User user = new User() { UserId = 5 };//使用实体进行查询。
                var users = connection.Query<User>("select * from [User] where UserId>@UserId", new User() { UserId = 5 });//user
                List<User> userss = users.AsList<User>();
                users.AsList().ForEach(p =>
                {
                    string result = string.Format("ID:{0},UserName:{1},Email:{2},Address:{3}", p.UserId, p.UserName, p.Email, p.Address);
                    MessageBox.Show(result);
                });
            }

 #region 匿名类更新数据            
            //using (IDbConnection connection = new SqlConnection(connStr))
            //{
            //    var result = connection.Execute("update [User] set UserName='randy',Address='上海' where UserId=@UserId", new { UserId = 2 });
            //    if (result > 0)
            //    {
            //        MessageBox.Show("更新成功！");
            //    }
            //    else {
            //        MessageBox.Show("更新失败！");
            //    }
            //}
            #endregion

            #region 实体类更新数据            
            //User user = new User() {UserId=4,Email="tim@qq.com" };
            //using (IDbConnection connection = new SqlConnection(connStr))
            //{
            //    var result = connection.Execute("update [User] set Email=@Email where UserId=@UserId", user);
            //    if (result > 0)
            //    {
            //        MessageBox.Show("更新成功！");
            //    }
            //    else
            //    {
            //        MessageBox.Show("更新失败！");
            //    }
            //}
            #endregion
            #region 使用键值对更新数据
            using (IDbConnection connection = new SqlConnection(connStr))
            {
                List<KeyValuePair<string, object>> keys = new List<KeyValuePair<string, object>>() {
                    new KeyValuePair<string, object>("@UserName","Max"),
                    new KeyValuePair<string, object>("@UserId",4),
                    new KeyValuePair<string, object> ("@Address","扬州")
                };
                var result = connection.Execute("update [User] set UserName=@UserName,Address=@Address where UserId=@UserId", keys);
                if (result > 0)
                {
                    MessageBox.Show("更新成功！");
                }
                else
                {
                    MessageBox.Show("更新失败！");
                }
            }
            #endregion

 #region 使用匿名类进行删除操作            
            //using (IDbConnection connection = new SqlConnection(connStr))
            //{
            //    var result = connection.Execute("delete [User] where UserId=@UserId", new { UserId = 7 });
            //    if (result > 0)
            //    {
            //        MessageBox.Show("删除成功！");
            //    }
            //    else
            //    {
            //        MessageBox.Show("删除失败！");
            //    }
            //}
            #endregion

            #region 使用实体删除数据
            User user = new User();
            user.UserId = 6;
            using (IDbConnection connection = new SqlConnection(connStr))
            {
                var result = connection.Execute("delete [User] where UserId=@UserId", user);
                if (result > 0)
                {
                    MessageBox.Show("删除成功！");
                }
                else
                {
                    MessageBox.Show("删除失败！");
                }
            }
            #endregion

 using (IDbConnection connection = new SqlConnection(connStr))
            {
                var sql = "select * from [User] where Email in @emails";
                var result = connection.Query<User>(sql, new { emails = new string[2] { "cindy@qq.com", "randy@qq.com" } });
                List<User> users = result.AsList<User>();
                result.AsList().ForEach(p =>
                {
                    Console.WriteLine("Id:" + p.UserId + " UserName:" + p.UserName + " Email:" + p.Email + " Address:" + p.Address);
                });
            }

            using (IDbConnection connection = new SqlConnection(connStr))
            {
                var sqlCmd = @"select * from [User] where UserId=@UserId;select * from [provinceInfo] where provinceid=@provinceid; ";
                var result = connection.QueryMultiple(sqlCmd, new { UserId = 2, provinceid = 10 });

                //下面这两句read，一定要与上面的sqlCmd语句中的select语句的顺序一样，即：我要先read User表中的数，那么就要将select User表的语句放在前面。
                var users = result.Read<User>();
                var provinces = result.Read<ProvinceInfo>();

                users.AsList().ForEach(p =>
                {
                    MessageBox.Show("名字叫：" + p.UserName + "； 居住地：" + p.Address);
                });
                provinces.AsList().ForEach(p =>
                {
                    MessageBox.Show("省份为：" + p.province + "； id为：" + p.provinceid);
                });
            }

 using (IDbConnection connection = new SqlConnection(connStr))
            {
                var result = connection.Query<User>("存储过程的名字", new { UserId = 4 }, commandType: CommandType.StoredProcedure);//参数2是存储过程的输入参数。参数3指定本次query使用存储过程
                result.AsList<User>().ForEach(p =>
                {
                    MessageBox.Show("");
                });
            }

            #region 调用带有输出参数的存储过程            
            //CREATE proc procWithOutPara
            //@num1 int,
            //@num2 int,
            //@sum int output
            //as
            //begin
            //  set @sum = @num1 + @num2
            //end
            //GO

            using (IDbConnection connection = new SqlConnection(connStr))
            {
                DynamicParameters paras = new DynamicParameters();
                paras.Add("@num1", 23);
                paras.Add("@num2", 45);
                paras.Add("@summary", 0, DbType.Int32, ParameterDirection.Output);
                connection.Execute("procWithOutPara", paras, commandType: CommandType.StoredProcedure);
                int sum = paras.Get<int>("@summary");
            }
            #endregion

        public void ExecuteTransaction()
        {             
            using (IDbConnection con = new SqlConnection(conStr))
            {
                string strSQL = "DELETE FROM Users WHERE userID=@userID";
                DynamicParameters paras = new DynamicParameters();
                paras.Add("@userID", 10086);
                // 开启事物
                IDbTransaction trans = con.BeginTransaction();
                try
                {
                    con.Execute(strSQL, paras, transaction: trans);
                    // 提交事务
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    // 回滚事物
                    trans.Rollback();
                }
            }           
        }

官方文档：https://dapper-tutorial.net/dapper