Question

我已经将我的applciation托管到IIS -7并且浏览正确但是它让我现在登录，desipte我检查它有一个正确的连接字符串，它在我的日志页面抛出错误

描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 96:         SqlParameter[] arrParams = new SqlParameter[0];
Line 97:         _userDetails = Data.GetSQLQueryResults(sqlQuery, 0, arrParams);
Line 98:         if (_userDetails.Rows.Count != 0)
Line 99:         {
Line 100:            _userAccountID = _userDetails.Rows[0]["UserAccountID"].ToString();


Source File: d:\Projects\June 20\CorrDefensev2\App_Code\UserInfo.cs    Line: 98 

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   UserInfo.setUserData(MembershipUser membershipUser) in d:\Projects\June 20\CorrDefensev2\App_Code\UserInfo.cs:98
   UserInfo..ctor(String username) in d:\Projects\June 20\CorrDefensev2\App_Code\UserInfo.cs:76
   Account_Login.Login1_LoggingIn(Object sender, LoginCancelEventArgs e) in d:\Projects\June 20\CorrDefensev2\MyPublic\Login.aspx.cs:76
   System.Web.UI.WebControls.Login.OnLoggingIn(LoginCancelEventArgs e) +115
   System.Web.UI.WebControls.Login.AttemptLogin() +85
   System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +101
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.ImageButton.OnCommand(CommandEventArgs e) +125
   System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +177
   System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563



the solution: all i had to use sql server authentication that is a connection string in web.config with the username, password, and it works fantastic...

Answer 1

 SqlParameter[] arrParams = new SqlParameter[0];
 _userDetails = Data.GetSQLQueryResults(sqlQuery, 0, arrParams);

您传递的arrParams中包含零元素，您的查询可能需要一些参数来返回结果。您现在可以获得_userDetails的空值。您可以通过在_userDetails

上设置null来阻止异常

if (_userDetails != null && _userDetails.Rows.Count != 0)
{

}

找出确切原因

if (_userDetails != null)
{
   //No data table returned
   if( _userDetails.Rows.Count != 0)
   {
        //No record found
   }
}

为什么iis主机应用程序不允许登录？

1 个答案: