我有一个带有三个TextBox的VB表单。以下是我希望该程序实现的示例:
所以,这就是形式......程序对文本文件进行排序并获取名称,目标和位置。例如。
当点击更新按钮时,程序应该意识到James和Jordan被写了两次,删除其中一个并添加他们的目标,所以它应该输出:
为此,我已将数据传输到ListBoxes中,这样可以更轻松地删除重复项,然后将数据传输回多行TextBox,使其可编辑。到目前为止,这是我的代码。它要么给出错误的结果,要么指数超出范围错误。
Dim Count1 As Integer
Dim Count2 As Integer
Dim Count3 As Integer
Dim NewInt As Integer
Dim ValOne As Integer
Dim ValTwo As Integer
ListBox1.Items.Clear()
ListBox2.Items.Clear()
ListBox3.Items.Clear()
NewInt = 0
ValOne = 0
ValTwo = 0
ListBox1.Items.AddRange(Players.Text.Split(vbNewLine))
ListBox2.Items.AddRange(Goals.Text.Split(vbNewLine))
ListBox3.Items.AddRange(Positions.Text.Split(vbNewLine))
Count1 = ListBox1.Items.Count
Count2 = ListBox2.Items.Count
Count3 = ListBox3.Items.Count
If Count1 = Count2 And Count1 = Count3 And Count2 = Count3 Then
'Set two counters to compare all words with each other
For iFirstCounter As Integer = 0 To ListBox1.Items.Count - 1
For iSecondCounter As Integer = 0 To ListBox1.Items.Count - 1
'Make sure there will not be an 'out of range' error,
'because you are removing items from the listbox.
iSecondCounter = Convert.ToInt64(iSecondCounter)
iFirstCounter = Convert.ToInt64(iFirstCounter)
ListBox2.Items.RemoveAt(iSecondCounter)
ListBox2.Items.RemoveAt(iFirstCounter)
If iFirstCounter < iSecondCounter Then
ListBox2.Items.Insert(iFirstCounter, NewInt.ToString)
Else
ListBox2.Items.Insert(iSecondCounter, NewInt.ToString)
End If
Next
Next
Players.Text = ""
Goals.Text = ""
Positions.Text = ""
Dim i As Integer
For i = 0 To ListBox1.Items.Count - 1
If Players.Text = "" Then
Players.Text = ListBox1.Items(i)
Else
Players.Text = Players.Text & vbNewLine & ListBox1.Items(i)
End If
Next
Dim a As Integer
For a = 0 To ListBox2.Items.Count - 1
If Goals.Text = "" Then
Goals.Text = ListBox2.Items(a)
Else
Goals.Text = Goals.Text & vbNewLine & ListBox2.Items(a)
End If
Next
Dim b As Integer
For b = 0 To ListBox3.Items.Count - 1
If Positions.Text = "" Then
Positions.Text = ListBox3.Items(b)
Else
Positions.Text = Positions.Text & vbNewLine & ListBox3.Items(b)
End If
Next
Else
MessageBox.Show("The Text Boxes don't contain an equal number of values ... please add more/remove some values")
End If
可以通过多种方式完成,例如:
If TextBox2.Lines.Count > 1 Then
Dim LineList As List(Of String) = TextBox2.Lines.ToList 'textbox lines
Dim NewLines As List(Of String) = TextBox2.Lines.ToList 'can't edit list we're looping over, a copy of lines
Dim NamesList As New List(Of String)
For x = 0 To LineList.Count - 1
Dim linesplit As String() = LineList(x).Split({" "}, StringSplitOptions.RemoveEmptyEntries)
If NamesList.Contains(linesplit(0)) Then
NewLines.Remove(LineList(x))
Else
NamesList.Add(linesplit(0))
End If
Next
TextBox2.Lines = NewLines.ToArray
End If
这是通过LINQ和Lambdas执行此操作的代码示例。
Module Module1
Sub Main()
Dim ungroupedPlayers(1) As String
ungroupedPlayers(0) = "Jordan 26 Center"
ungroupedPlayers(1) = "Jordan 4 Center"
Dim players = ungroupedPlayers.ToList().ConvertAll(Of Player)(Function(x As String) As Player
Dim split() As String = x.Split(" "c)
Dim p As New Player
p.PlayerName = split(0)
p.Count = split(1)
p.Position = split(2)
Return p
End Function)
Dim playersGrouped = From p In players
Group By PlayerName = p.PlayerName Into g = Group
Select PlayerName, Count = g.Sum(Function(ip As Player) ip.Count), Position = g.Min(Function(ip As Player) ip.Position.ToString())
Dim groupedPlayers() As String = playersGrouped.ToList().ConvertAll(Of String)(Function(ip)
Return ip.PlayerName.ToString() & " " & ip.Count.ToString() & " " & ip.Position.ToString()
End Function).ToArray()
For Each groupedPlayer as String in groupedPlayers
Console.WriteLine(groupedPlayer)
Next
Console.Read()
End Sub
Public Class Player
Public PlayerName As String
Public Count As Integer
Public Position As String
End Class
End Module
你不需要沉重的ListBox
控制来处理玩家数据。
使用List(Of T)
并创建类Player
以提高可读性。
您可以在表单中显示值之前删除重复项。
而不是多行文本框,您可以使用DataGridView
作为“编辑数据的正确工具”。
Public Class Player
Public Property Name As String
Public Property Position As String
Public Property Goals As Integer
End
Public Class PlayersForm : Form
Private Sub Form_Load(sender As Object, e As System.EventArgs) Handles MyBase.Load
Dim data As List(Of Player) = LoadPlayersData()
Dim players As List(Of Player) = NormalizeData(data)
' Use DataGridView
Me.DataGridView1.DataSource = players
End Sub
Private Function LoadPlayersData() As List(Of Player)
Dim rawData As String() = File.ReadAllLines("pathToTextFile")
Return rawData.Select(Function(line) LineToPlayer(line)).ToList()
End Function
Private Function NormalizeData(players As List(Of Player)) As List(Of Player)
Return players.Group(Function(player) player.Name)
.Select(Function(group)
Return New Player With
{
.Name = group.Key,
.Position = group.First().Position,
.Goals = group.Sum(Function(player) player.Goals)
}
End Function)
.ToList()
End Function
Private Function LineToPlayer(line As String) As Player
Dim values = line.Split(" "c)
Return New Player With
{
.Name = values(0),
.Position = values(2),
.Goals = Integer.Parse(values(1))
}
End Function
End Class
当您进行任何更改时,DataGridView
控件将自动更新您的列表(播放器)。这使你有可能有一些其他控件自动显示最好的得分手,例如,没有额外的数据从字符串转换为整数和返回。