Question

我一直是“如果它没有被破坏而不修复它”的粉丝但我的代码，虽然正常运行，但是抛出 connectionstring属性还没有初始化消息。类似的帖子暗示连接字符串为null ---所以我在连接打开命令周围添加了if IsNullOrEmpty。抛出异常的行。注意：我的连接字符串是从连接字符串数据库中检索的。这是.aspx页面的c＃代码隐藏文件。提前感谢您提供有关例外原因的任何建议。

代码：

using (SqlConnection sconn = new SqlConnection(someconnectionstring.Value.ToString()))
        {
            using (SqlCommand scmd = new SqlCommand("mydb.[dbo].[myStoredProc]", sconn))
            {
                scmd.CommandType = CommandType.StoredProcedure;
                scmd.Parameters.Add("@valueX", SqlDbType.VarChar).Value = 2; 
                scmd.Parameters.Add("@returnValue", SqlDbType.Int);
                scmd.Parameters["@returnValue"].Direction = ParameterDirection.Output;
        //testing for null as suggested...
        if (!string.IsNullOrEmpty(sconn.ToString()) || sconn.ToString() != "")   //the ||  != "" may be double work.. not sure
                {
                    sconn.Open();  //code throw exception here but continues to work.
                    SqlDataReader adar = scmd.ExecuteReader();
                    if (adar.HasRows)
                    {

                        while (adar.Read())
                        {
                            hiddenfieldX.Value = adar["valueX"].ToString();
            ...
                        }
                        sconn.Close();
                    }
                }
            }
        }
    }
    catch (SqlException er)
    {
    //The ConnectionString property has not been initialized thrown here
    }

Answer 1

如配合所述，连接字符串可能为空或形式不正确。

1-检查连接字符串是否正确（您可以发布它，我们可以检查）

2-如果您的代码如下所示会更好：

string someconnectionstring = "yourConnectionString";

if (!string.IsNullOrEmpty(someconnectionstring))
{
    using (SqlConnection sconn = new SqlConnection(someconnectionstring))
    {
        using (SqlCommand scmd = new SqlCommand("mydb.[dbo].[myStoredProc]", sconn))
        {
            scmd.CommandType = CommandType.StoredProcedure;
            scmd.Parameters.Add("@valueX", SqlDbType.VarChar).Value = 2;
            scmd.Parameters.Add("@returnValue", SqlDbType.Int);
            scmd.Parameters["@returnValue"].Direction = ParameterDirection.Output;

            sconn.Open();  //code throw exception here but continues to work.
            SqlDataReader adar = scmd.ExecuteReader();
            if (adar.HasRows)
            {

                while (adar.Read())
                {
                    //...
                }
            }                
            sconn.Close();
        }
    }
}

ConnectionString属性尚未初始化sqlcommand但代码仍然有效

1 个答案: