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)：

复制代码 代码如下:

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(@"binDebug") || dataDir.EndsWith(@"binRelease"))

{

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

}

}

}

}