SqlConnection conn=null;
try
{
PrepareEverionment();
conn = new SqlConnection();
conn.ConnectionString = "...................";
conn.Open();
}
finally
{
conn.Close();
}
这段代码问题是:如PrepareEverionment()发生异常时,conn就任然为null在执行finally中代码时就会出异常,应该用using这样在using中会自动判断conn是否为null