asp.net - ASP.Net - 数学运算和百分比 - VB

Question

我有一个如下表，我在每列中填充了“通过”和“失败”记录的数量。然后，我尝试计算每列的故障率以及 3 个“IR Room”设备和 3 个“Employee Exit”设备的平均故障率。

我正在使用本文底部的代码填充标签，但是我有两个问题：-

1. 我在第 86 行收到“输入字符串格式不正确”错误（将 irAverageFailureRate 调暗为字符串）

2. 我不禁想到有更好的方法来做到这一点。我是 ASP/VB 的新手，因此我们将不胜感激地收到任何有关如何改进它的建议。

   Sub getYesterdayStats()
   
   Dim con As OleDbConnection
   Dim cmdClockings As OleDbDataAdapter
   Dim dsClockings As New DataSet
   Dim yesterday As String = DateTime.Today.AddDays(-1).ToString("yyyy/MM/dd")
   
   
   con = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; DATA SOURCE=\\XXX.XX.XXX.XX\XXXX.mdb;Jet OLEDB:Database Password=XXXXX;")
   cmdClockings = New OleDbDataAdapter("SELECT efrLog.PID, efrLog.LType, efrLog.LDName from efrLog WHERE LDate = '" & yesterday & "'", con)
   
   cmdClockings.Fill(dsClockings, "Clockings")
   
   ' Get pass and fail count for each device
   Dim ir1Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'IR Room 1'").Count
   Dim ir1Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'IR Room 1'").Count
   Dim ir2Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'IR Room 2'").Count
   Dim ir2Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'IR Room 2'").Count
   Dim ir3Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'IR Room 3'").Count
   Dim ir3Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'IR Room 3'").Count
   Dim ee1Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'Employee Exit 1'").Count
   Dim ee1Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'Employee Exit 1'").Count
   Dim ee2Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'Employee Exit 2'").Count
   Dim ee2Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'Employee Exit 2'").Count
   Dim ee3Pass As Integer = dsClockings.Tables("Clockings").Select("LType = 'PASS' AND LDName = 'Employee Exit 3'").Count
   Dim ee3Fail As Integer = dsClockings.Tables("Clockings").Select("LType = 'DENY' AND LDName = 'Employee Exit 3'").Count
   
   ' Calculate totals for each device
   Dim ir1total As Integer = ir1Pass + ir1Fail
   Dim ir2total As Integer = ir2Pass + ir2Fail
   Dim ir3total As Integer = ir3Pass + ir3Fail
   Dim ee1total As Integer = ee1Pass + ee1Fail
   Dim ee2total As Integer = ee2Pass + ee2Fail
   Dim ee3total As Integer = ee3Pass + ee3Fail
   
   ' Calcualte failure rate for each device
   Dim ir1failureRate As String = Format((ir1Fail / ir1Pass) * 100, "0.00")
   Dim ir2failureRate As String = Format((ir2Fail / ir2Pass) * 100, "0.00")
   Dim ir3failureRate As String = Format((ir3Fail / ir3Pass) * 100, "0.00")
   Dim ee1failureRate As String = Format((ee1Fail / ee1Pass) * 100, "0.00")
   Dim ee2failureRate As String = Format((ee2Fail / ee2Pass) * 100, "0.00")
   Dim ee3failureRate As String = Format((ee3Fail / ee3Pass) * 100, "0.00")
   
   ' Calculate average failure rate for IR and EE devices
   Dim irAverageFailureRate As String = Format((Format((ir1Fail / ir1Pass) * 100, "0.00") + Format((ir2Fail / ir2Pass) * 100, "0.00") + Format((ir3Fail / ir3Pass) * 100, "0.00")) / 3, "0.00")
   Dim eeAverageFailureRate As String = Format((Format((ee1Fail / ee1Pass) * 100, "0.00") + Format((ee2Fail / ee2Pass) * 100, "0.00") + Format((ee3Fail / ee3Pass) * 100, "0.00")) / 3, "0.00")
   
   ' Assign values to labels
   lblIR1pass.Text = ir1Pass
   lblIR1fail.Text = ir1Fail
   lblIR2pass.Text = ir2Pass
   lblIR2fail.Text = ir2Fail
   lblIR3pass.Text = ir3Pass
   lblIR3fail.Text = ir3Fail
   lblEE1pass.Text = ee1Pass
   lblEE1fail.Text = ee1Fail
   lblEE2pass.Text = ee2Pass
   lblEE2fail.Text = ee2Fail
   lblEE3pass.Text = ee3Pass
   lblEE3fail.Text = ee3Fail
   lblIR1tot.Text = ir1total
   lblIR2tot.Text = ir2total
   lblIR3tot.Text = ir3total
   lblEE1tot.Text = ee1total
   lblEE2tot.Text = ee2total
   lblEE3tot.Text = ee3total
   lblIR1fr.Text = ir1failureRate & "%"
   lblIR2fr.Text = ir2failureRate & "%"
   lblIR3fr.Text = ir3failureRate & "%"
   lblEE1fr.Text = ee1failureRate & "%"
   lblEE2fr.Text = ee2failureRate & "%"
   lblEE3fr.Text = ee3failureRate & "%"
   lblIRafr.Text = irAverageFailureRate & "%"
   lblEEafr.Text = eeAverageFailureRate & "%"
   

   结束子

Answer 1

该行中有很多不必要的格式。

Dim irAverageFailureRate As String = ((CDbl(ir1Fail) / ir1Pass) + (CDbl(ir2Fail) / ir2Pass) + (CDbl(ir3Fail) / ir3Pass) / 3).ToString("P")

我从Standard Numeric Format Strings得到百分比的“P” 。