按代码初始化成员资格提供程序

Question

我正在尝试按代码初始化SQL成员资格提供程序，一切都在第一个请求中正常工作！ 当下面的代码再次执行时（例如刷新页面后）我收到以下错误 ：

  

属性“connectionStringName”缺失或为空。

页面加载代码：

MembershipSection membershipSection = (MembershipSection)ConfigurationManager.GetSection("system.web/membership");
                    string sqlProviderName = "AspNetSqlMembershipProvider";
                    NameValueCollection providerConfig;
                    providerConfig = membershipSection.Providers[sqlProviderName].Parameters; // returning empty list in the second request
                    var _SqlProvider = new SqlMembershipProvider();
                    _SqlProvider.Initialize(sqlProviderName, providerConfig);

的Web.config：

<membership defaultProvider="AspNetSqlMembershipProvider">
      <providers>  
        <clear />  
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ConnectionString" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" passwordFormat="Encrypted" maxInvalidPasswordAttempts="5" passwordAttemptWindow="10" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" applicationName="/" />
      </providers>
    </membership>

任何建议？

Answer 1

如何将数据/ connectionstring / obj保持在静态级别（如单例）？

它不像在整个Web实例中都会改变连接字符串，是吗？

static string/dataType _DataToBeRead1timeOnly = null;
static string/dataType DataToBeRead1timeOnly 
{
  get {
    if (_DataToBeRead1timeOnly == null) { _DataToBeRead1timeOnly = .... }
    return _DataToBeRead1timeOnly;
    }
}