DataTable案例VB.Net [英] DataTable case VB.Net

问题描述

你们知道appDt（0）和schedDt（0）的索引类型是什么？他们为什么不指示.rows属性？

Do You guys know what kind of indexing appDt(0) and schedDt(0) have? Why they didn't indicate .rows property instead?

Dim tb As TextBox = CType(UserIdTextBox, TextBox)
           Dim userName As String = tb.Text
           Dim gvw As GridView = CType(sender, GridView)
           Dim scheduleId As Integer = Integer.Parse(gvw.SelectedRow.Cells(1).Text)

           Dim caspbll As New CASpBLL

           Dim schedDt As tbCASp_ExamScheduleDataTable = caspbll.GetExamSchedule(scheduleId)
           Dim appDt As QuickAppInfoDataTable = caspbll.AppInfoSummary(userName)
           Dim regDt As tbCASp_RegistrationDataTable = caspbll.GetExamReg(userName, scheduleId)
           If appDt IsNot Nothing AndAlso appDt.Rows.Count = 1 Then
               If regDt IsNot Nothing AndAlso regDt.Rows.Count = 0 And (Not caspbll.AlreadyRegisteredForThisExam(appDt(0).ApplicationID, schedDt(0).ExamID)) Then
                   Dim RegNumber As String = ""
                   Dim RegId As Integer
                   RegId = caspbll.NewRegistration(appDt(0).ApplicationID, scheduleId, HttpContext.Current.Request.UserHostAddress, RegNumber)
                   Dim CASp As New CASpBLL
                   CASp.UpdateExamRegFromDSA601(Today.ToShortDateString(), SpecialAccomodationCheckBox.Checked, NoSaturdayExamCheckBox.Checked, RegId)
                   Response.Redirect(String.Format("view_registration.aspx?regid={0}", RegId.ToString()))
               Else
                   lblErrorMsg.Visible = True
                   lblErrorMsg.Text = "User has already registered for a session for this exam"
               End If
           Else
               lblErrorMsg.Visible = True
               lblErrorMsg.Text = "UserId doesn't exist."
           End If

推荐答案

否如果没有看到您正在访问的对象的代码，您可以真正为您解答此问题。但我希望您的QuickAppInfoDataTable和tbCASp_RegistrationDataTable类型都实现iEnumerator / iEnumerable，因此引用其中一个实例的实例已经为您引用了该行。 http://msdn.microsoft.com/en-us /library/system.collections.ienumerator(v=vs.110).aspx [ ^ ]

No one can really answer this for you without seeing the code for the objects you're accessing. But I'd expect that your QuickAppInfoDataTable and tbCASp_RegistrationDataTable types are both implementing iEnumerator/iEnumerable, so referencing an instance of either is already referencing the row for you. http://msdn.microsoft.com/en-us/library/system.collections.ienumerator(v=vs.110).aspx[^]

这篇关于DataTable案例VB.Net的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！