ConnectionString 属性尚未初始化 将数据插入数据库时​​出错

Question

我目前正在使用 .NET Web Api 使用存储过程将用户注册到 SQL Server。当我尝试向数据库添加记录时，出现错误

ConnectionString 属性尚未初始化

我已经在互联网上查找以更改连接字符串，但结果仍然相同。我在调试的时候，代码执行到了这一行

db.ExecNonQuery("SSO_Register", parm)

在doRegister 方法中然后抛出异常。请帮忙。

连接字符串：

<connectionStrings>
    <add name="_cs" 
         connectionString="Data Source=DESKTOP-KR81RU5\MSSConQLSERVER01;Initial Catalog=HISDB;Integrated Security=True;Connect Timeout=3600" 
         providerName="System.Data.SqlClient" />
</connectionStrings>

dbUtil类：

private static string _cs = null;

public dbUtil(string cs)
{
    _cs = cs;
}

public void ExecNonQuery(string sp, SqlParameter[] parm)
{
    using (SqlConnection connection = new SqlConnection(_cs))
    {
        using (SqlCommand command = new SqlCommand(sp, connection))
        {
            command.CommandType = CommandType.StoredProcedure;
            command.CommandTimeout = 120;

            connection.Open();

            if (parm != null)
            {
                for (int i = 0; i < parm.Length; i++)
                    command.Parameters.Add(parm[i]);
            }

            command.ExecuteNonQuery();
        }
    }
}

doRegister方法：

bool _return = false;

try
{
    string tac = " ";

    Test util = new Test();
    tac = Test.getTac();

    SqlParameter[] parm =
                {
                    new SqlParameter("secure_word", objsso.secure_word),
                    new SqlParameter("full_name", objsso.full_name),
                    new SqlParameter("phone_number", objsso.phone_number),
                    new SqlParameter("nationality", objsso.nationality),
                    new SqlParameter("id_number", objsso.id_number),
                    new SqlParameter("dob", objsso.dob),
                    new SqlParameter("email", objsso.email),
                    new SqlParameter("user_id", objsso.email),
                    new SqlParameter("full_name", objsso.full_name),
                    new SqlParameter("provider_id", objsso.provider_id),
                    new SqlParameter("temp_token", objsso.temp_token),
                    new SqlParameter("tac", tac)
                 
            };

    dbUtil db = new dbUtil(_cs);
    db.ExecNonQuery("SSO_Register", parm);
    _return = true;
}
catch (Exception ex)
{
    _return = false;
    throw ex;
}

return _return;

Answer 1

您没有从配置中读取连接字符串，因此在您的情况下连接字符串为空。

var connectionString =System.Configuration.ConfigurationManager.
ConnectionStrings["_cs"].ConnectionString;

dbUtil db = new dbUtil(connectionString );

请试试这个。