求助:调用app.config怎么打不开数据库连接哈?
App.config文件如下:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="source" connectionString="server=localhost;uid=sa;pwd=;database=hc_his"/>
</connectionStrings>
</configuration>
调用函数为:
using System.Configuration;
......
void DB_Open()
{
string connstring =ConfigurationManager.ConnectionStrings["source"].ConnectionString;
myconn = new SqlConnection(connstring);
myconn.Open();
}
调试时出现:string connstring =ConfigurationManager.ConnectionStrings["source"].ConnectionString;未将对象引用设置到对象的实例
机子上装的是vs2005,昨天搞了一天了,头都大了 搞不懂哈!
用connstring = "server=localhost;uid=sa;pwd=;database=hc_his"可以连接数据库。
等待高手解答哈!!
小弟第一次发贴哈!