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(@"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
}
}
}
}