我正在为我的VB课做一个作业，我真的很难用它，我真的很感激一些帮助，指针和/或例子。我不希望给出确切的答案，但类似的例子会非常好。
CSV文件有5列，每列有25行。最重要的是我需要取最后两列并计算最后两行的标记，这两行都是十进制整数，并将其放在输出中。换句话说，我需要将两列合并，并将计算结果放在该列中。
这是作业：
申请标题：库存控制
目的：
此Windows MDI应用程序允许用户显示整个库存并计算销售价格，或以库存价格显示库存中的选定商品。
步骤：
从主文档中，用户将从菜单中选择“全部”或“选择”。相应的表单将显示在MDI窗口中。如果用户已选择全部，则只会显示库存项目，并按最后一列中的销售价格排列。如果用户选择了选择，则会出现一个选中的列表框，允许用户选择她希望看到的库存项目。然后，所选项目将显示在最后一列中具有售价的列中。然后，用户应该可以使用File Exit菜单项退出程序。
算法，处理和条件：
计划要求：
这是我到目前为止的代码：
Public Class frmMain
Private Sub mnuFileExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFileExit.Click
'Close the program
Me.Close()
End Sub
Private Sub mnuHelpAbout_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuHelpAbout.Click
'Simple help box
MessageBox.Show("Inventory control program. Version 1.0")
End Sub
Private Sub mnuInvenListAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuInvenListAll.Click
'Create the child form the form
Dim mdiChild1 As New frmAll
'Set form as parent.
mdiChild1.MdiParent = Me
'display the form as Show
mdiChild1.Show()
End Sub
Private Sub mnuInvenSelect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuInvenSelect.Click
'Create the child for the form
Dim mdiChild2 As New frmSelect
'Set form as parent.
mdiChild2.MdiParent = Me
'display the form as Show
mdiChild2.Show()
End Sub
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.LayoutMdi(MdiLayout.TileHorizontal)
End Sub
End Class
=-=-=-=-=
Imports System.IO
Imports System.Convert
Public Class frmAll
'Declare Streamreader
Private objReader As StreamReader
'Declare arrays to hold the information
Private strNumber(24) As String
Private strName(24) As String
Private strSize(24) As String
Private Sub frmAll_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Set objReader
objReader = New StreamReader("products.csv")
Call FillArray()
End Sub
Private Sub FillArray()
'Declare variables and arrays
Dim decCost(24, 1) As Decimal
Dim strFields() As String
Dim strRec As String
Dim intCount As Integer = 0
Dim chrdelim As Char = ToChar(",")
'Set strRec to read the lines
strRec = objReader.ReadLine
'Do while loop to fill array.
Do While strRec <> Nothing
strFields = strRec.Split(chrdelim)
strNumber(intCount) = strFields(0)
strName(intCount) = strFields(1)
strSize(intCount) = strFields(2)
decCost(intCount, 0) = ToDecimal(strFields(3))
decCost(intCount, 1) = ToDecimal(strFields(4))
'Set strRec to read the lines again
strRec = objReader.ReadLine
'increment the index
intCount += 1
Loop
Call Calculate(decCost)
End Sub
Private Sub Calculate(ByVal numIn(,) As Decimal)
'Define arrays to hold total cost
Dim decRowTotal(24) As Decimal
'Define variables to hold the counters for rows and columns
Dim intR As Integer
Dim intC As Integer
'Calcualte total cost
For intC = 0 To numIn.Length
For intR = 0 To decRowTotal.Length
decRowTotal(intR) += numIn(intR, intC) * 1
Next
Next
Call Output(numIn, decRowTotal)
End Sub
Private Sub Output(ByVal NumIn(,) As Decimal, ByVal RowTotalIn() As Decimal)
Dim strOut As String
Dim intR As Integer = 0
Dim intC As Integer = 0
strOut = "ID" & vbTab & "Item" & vbTab & "Size" & vbTab & "Total Price" & vbCrLf & vbCrLf
For intR = 0 To 24
strOut &= strNumber(intC) & vbTab
strOut &= strName(intC) & vbTab
strOut &= strSize(intC) & vbTab
For intC = 0 To 1
strOut &= NumIn(intR, intC).ToString
Next
strOut &= vbTab & RowTotalIn(intR) & vbCrLf
Next
rtbAll.Text = strOut
End Sub
End Class
-=-=-=-=-=
'Imports
Imports System.IO
Imports System.Convert
Public Class InventoryItems
'Declare ItemList Array
Private ItemList As New ArrayList
'IItem declared as new Object.
Private IItem As New Object
Public Function Reader() As ArrayList
'Declare variables for reading the file.
Dim chrDelim As Char = Convert.ToChar(",")
Dim strRec As String
Dim strFields() As String
Dim objReader As StreamReader
objReader = New StreamReader("products.csv")
strRec = objReader.ReadLine
'Declares a new instance of the InvenItems class
'and stores each of the items in their own instance
'of the class
Do While strRec <> Nothing
IItem = New InvenItems
strFields = strRec.Split(chrDelim)
IItem.Number = strFields(0)
IItem.Name = strFields(1)
IItem.Size = strFields(2)
IItem.Price = ToDecimal(strFields(3))
IItem.MarkUp = ToDecimal(strFields(4))
ItemList.Add(IItem)
strRec = objReader.ReadLine
Loop
Return ItemList
End Function
Public Class InvenItems
'Declare class variables.
Private strNumber As String
Private strName As String
Private strSize As String
Private decCost As Decimal
Private decMarkUp As Decimal
'Create constructor
Public Sub New()
End Sub
'Create override function
Public Overrides Function ToString() As String
Return strNumber
End Function
'Create property for Number.
Public Property Number As String
Set(ByVal value As String)
strNumber = value
End Set
Get
Return strNumber
End Get
End Property
'Create property for Name.
Public Property Name As String
Set(ByVal value As String)
strName = value
End Set
Get
Return strName
End Get
End Property
'Create property for size.
Public Property Size As String
Set(ByVal value As String)
strSize = value
End Set
Get
Return strSize
End Get
End Property
'Create property for cost.
Public Property Cost As Decimal
Set(ByVal value As Decimal)
decCost = value
End Set
Get
Return decCost
End Get
End Property
Public Property MarkUp As Decimal
Set(ByVal value As Decimal)
decMarkUp = value
End Set
Get
Return decMarkUp
End Get
End Property
End Class
End Class
感谢您提供任何指示，建议和示例。
答案 0 :(得分：0)
这将告诉您需要在InventoryItems.Reader中使用Dim IItem = New InvenItems，这将显示另一个问题。