C#中连接.mdf文件

C#连接本地.mdf文件：项目中右键点击，新增——数据——基于服务的数据库，项目下直接生成.mdf数据库文件，后台(数据库的写入用参数传递)：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;



namespace ADO.NET

{

    class Program

    {

        static void Main(string[] args)

        {

            //SQLServer 附加mdf文件

            string dataDir = AppDomain.CurrentDomain.BaseDirectory;

            if (dataDir.EndsWith(@"\bin\Debug\") || dataDir.EndsWith(@"\bin\Release\"))

            {

                dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;

                AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);

            }

            using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True"))

            {

                conn.Open();

                //写入一条数据

                string strUserName = "作业本";

                string strPWD = "Ab123456";



                using (SqlCommand sqlCmd = conn.CreateCommand())

                {

                    sqlCmd.CommandText = "insert into Mytable1(Name,Password) values (@UserName,@PWD) ";//连接字符串进行参数化

                    SqlParameter[] sqlPara = new SqlParameter[] { 

                    new SqlParameter("UserName",strUserName),

                    new SqlParameter("PWD",strPWD)

                    };

                    sqlCmd.Parameters.AddRange(sqlPara); //把Paramerter 数组参数添加到sqlCmd中

                    sqlCmd.ExecuteNonQuery();

                    Console.WriteLine("Insert OK");

                }



                //从表中读取数据

                string strRead = "SELECT   ID, Name, Password FROM      MyTable1 ";

                using (SqlCommand sqlCmd = new SqlCommand(strRead, conn))

                {

                    //sqlDataReader 逐行读取数据

                    using (SqlDataReader sdr = sqlCmd.ExecuteReader())

                    {

                        while (sdr.Read())

                        {



                            int id = sdr.GetInt32(sdr.GetOrdinal("ID"));  //sdr.GetOrdinal 获取列的序号

                            string Name = sdr.GetString(sdr.GetOrdinal("Name"));

                            bool PWD = sdr.IsDBNull(sdr.GetOrdinal("Password"));

                            Console.WriteLine("ID:{0},Name:{1},PWD：{2}", id, Name, PWD);

                            Console.WriteLine(sdr.GetString(1));

                        }

                    }

                }

                conn.Close();//此处可以省略，Dispose()方法会自动检查

            }





        }

    }

}