c#连接mdf文件示例分享

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
            }
        }
    }
}