public class GetCon
{
private static SqlConnection conn;
private static SqlDataAdapter da;
private static SqlCommand com;
private static SqlDataReader dr;
private static string strCon;
public GetCon()
{
}
public static SqlConnection GetConnection()
{
strCon = ConfigurationSettings.AppSettings["zhukeConnection"].ToString();
conn = new SqlConnection(strCon);
return conn;
}
}
编译时 在strCon = ConfigurationSettings.AppSettings["zhukeConnection"].ToString();处出现“未将对象引用设置到对象的实例。”的错误，请问为何。
