Vb.net 单击标题时如何对Listview列进行排序
我正在写一个家庭作业计划,我有一个ListView元素 我正在寻找一个代码片段,它允许我在单击列标题时按字母顺序排列列。如果已按升序排序,则切换到降序,反之亦然,然后按默认/第一个排序,即下面屏幕截图中的“状态” 我在谷歌上搜索了一下,没有找到任何有用的东西,你能帮我吗Vb.net 单击标题时如何对Listview列进行排序,vb.net,listview,sorting,Vb.net,Listview,Sorting,我正在写一个家庭作业计划,我有一个ListView元素 我正在寻找一个代码片段,它允许我在单击列标题时按字母顺序排列列。如果已按升序排序,则切换到降序,反之亦然,然后按默认/第一个排序,即下面屏幕截图中的“状态” 我在谷歌上搜索了一下,没有找到任何有用的东西,你能帮我吗 Private Sub ColumnClick(ByVal sender As Object, _ ByVal e As System.Windows.Forms.ColumnClickEventArgs) _
Private Sub ColumnClick(ByVal sender As Object, _
ByVal e As System.Windows.Forms.ColumnClickEventArgs) _
Handles lvKalender.ColumnClick
Select Case e.Column
' Nach Namen sortieren
Case 0
If lvKalender.Columns.Item(0).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(0).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(0).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(0).ListView.Sorting = SortOrder.Ascending
End If
Case 1
If (1).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(1).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(1).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(1).ListView.Sorting = SortOrder.Ascending
End If
Case 2
If lvKalender.Columns.Item(2).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(2).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(2).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(2).ListView.Sorting = SortOrder.Ascending
End If
Case 3
If lvKalender.Columns.Item(3).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(3).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(3).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(3).ListView.Sorting = SortOrder.Ascending
End If
Case 4
If lvKalender.Columns.Item(4).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(4).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(4).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(4).ListView.Sorting = SortOrder.Ascending
End If
Case 5
If lvKalender.Columns.Item(5).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(5).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(5).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(5).ListView.Sorting = SortOrder.Ascending
End If
Case 6
If lvKalender.Columns.Item(6).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(6).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(6).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(6).ListView.Sorting = SortOrder.Ascending
End If
End Select
End Sub
Private子列单击(ByVal sender作为对象_
ByVal e作为System.Windows.Forms.ColumnClickEventArgs)_
处理lvKalender.column单击
选择案例e.列
“Nach Namen sortieren
案例0
如果lvKalender.Columns.Item(0.ListView.SortingSortOrder.Descending,则
lvKalender.Columns.Item(0.ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(0).ListView.Sorting SortOrder
lvKalender.Columns.Item(0).ListView.Sorting=SortOrder.升序
如果结束
案例1
如果(1).ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(1).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(1).ListView.Sorting SortOrder.升序
lvKalender.Columns.Item(1).ListView.Sorting=SortOrder.升序
如果结束
案例2
如果是lvKalender.Columns.Item(2).ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(2).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(2).ListView.Sorting SortOrder.然后升序
lvKalender.Columns.Item(2).ListView.Sorting=SortOrder.升序
如果结束
案例3
如果是lvKalender.Columns.Item(3).ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(3).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(3).ListView.Sorting SortOrder.然后升序
lvKalender.Columns.Item(3).ListView.Sorting=SortOrder.升序
如果结束
案例4
如果是lvKalender.Columns.Item(4).ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(4).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(4).ListView.Sorting SortOrder.然后升序
lvKalender.Columns.Item(4).ListView.Sorting=SortOrder.升序
如果结束
案例5
如果lvKalender.Columns.Item(5).ListView.Sorting SortOrder.Descending
lvKalender.Columns.Item(5).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(5).ListView.Sorting SortOrder.然后升序
lvKalender.Columns.Item(5).ListView.Sorting=SortOrder.升序
如果结束
案例6
如果是lvKalender.Columns.Item(6).ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(6).ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(6).ListView.Sorting SortOrder.然后升序
lvKalender.Columns.Item(6).ListView.Sorting=SortOrder.升序
如果结束
结束选择
端接头
如果我了解您的问题,您希望在列表视图中对日期列(可能还有一些值?)进行排序。问题是列表视图中的所有内容都是字符串/文本。有些子项(COL)可能看起来像日期,但那只是因为你的大脑就是这样翻译/解释它们的——它们实际上是字符串
这样做的影响是,对包含数字的文本进行排序很少奏效。例如,“90”
的排序总是高于“300”
,因为“9”
“3”
,“19.08.2014”
的排序总是高于“10.01.2019”
。数字和数字的值不一样
要按文本以外的内容进行排序,您需要一个ListViewItemSorter
。这是日期:
Friend Class ListViewItemDateComparer
Implements IComparer
Private col As Integer
Private _sort As SortOrder = SortOrder.Ascending
Public Sub New(column As Integer, sort As Windows.Forms.SortOrder)
col = column
_sort = sort
End Sub
Public Function Compare(x As Object,
y As Object) As Integer Implements System.Collections.IComparer.Compare
Dim returnVal As Integer = -1
' parse LV contents back to DateTime value
Dim dtX As DateTime = DateTime.Parse(CType(x, ListViewItem).SubItems(col).Text)
Dim dtY As DateTime = DateTime.Parse(CType(y, ListViewItem).SubItems(col).Text)
' compare
returnVal = DateTime.Compare(dtX, dtY)
If _sort = SortOrder.Descending Then
returnVal *= -1
End If
Return returnVal
End Function
End Class
要使用它:
Dim LVSorter = New ListViewItemDateComparer(COL_TO_SORT, Sort_Order)
myLV.ListViewItemSorter = LVSorter
COL\u TO\u SORT
是您希望对包含日期的列/子项索引进行排序
Sort\u Order
将是标准的WinForms排序器(SortOrder.Ascending
etc)
要比较其他数据类型,Decimal
例如,克隆比较器
并更改进行比较的3行:
' parse LV contents back to Decimal value
Dim dtX As Decimal = Decimal.Parse(CType(x, ListViewItem).SubItems(col).Text)
Dim dtY As Decimal = Decimal.Parse(CType(y, ListViewItem).SubItems(col).Text)
' compare
returnVal = Decimal.Compare(dtX, dtY)
Private子列单击(ByVal sender作为对象_
ByVal e作为System.Windows.Forms.ColumnClickEventArgs)_
处理lvKalender.column单击
如果lvKalender.Columns.Item(e.Column.ListView.Sorting SortOrder.Descending,则
lvKalender.Columns.Item(e.Column.ListView.Sorting=SortOrder.Descending
ElseIf lvKalender.Columns.Item(e.Column.ListView.SortingSortOrder.升序
lvKalender.Columns.Item(e.Column.ListView.Sorting=SortOrder.升序
如果结束
端接头
私有子ListViewProcess\u ColumnClick(发送者作为对象,e作为ColumnClickEventArgs)处理ListViewProcess.ColumnClick
sender.AutoResizeColumn(例如Column、ColumnHeaderAutoResizeStyle.HeaderSize)
如果sender.Columns.Item(e.Column.ListView.SortingSortOrder.Descending,则
sender.Columns.Item(e.Column).ListView.Sorting=SortOrder.Descending
ElseIf sender.Columns.Item(e.Column.ListView.Sorting SortOrder.Ascending然后
sender.Columns.Item(e.Column).ListView.Sorting=SortOrder.升序
如果结束
端接头
您可能想用英语翻译Thatbite schreiben Sie!:)首先对不起,蒂姆,我已经用谷歌翻译工具翻译了,让我猜猜。您想根据列表视图列的内容(日期、数字、字符串)对其进行排序吗?不,一小时一次都是字符串=stude是整数日期是字符串,因为我在mysql中编写了日期
Private Sub ColumnClick(ByVal sender As Object, _
ByVal e As System.Windows.Forms.ColumnClickEventArgs) _
Handles lvKalender.ColumnClick
If lvKalender.Columns.Item(e.Column).ListView.Sorting <> SortOrder.Descending Then
lvKalender.Columns.Item(e.Column).ListView.Sorting = SortOrder.Descending
ElseIf lvKalender.Columns.Item(e.Column).ListView.Sorting <> SortOrder.Ascending Then
lvKalender.Columns.Item(e.Column).ListView.Sorting = SortOrder.Ascending
End If
End Sub
Private Sub ListViewProcess_ColumnClick(sender As Object, e As ColumnClickEventArgs) Handles ListViewProcess.ColumnClick
sender.AutoResizeColumn(e.Column, ColumnHeaderAutoResizeStyle.HeaderSize)
If sender.Columns.Item(e.Column).ListView.Sorting <> SortOrder.Descending Then
sender.Columns.Item(e.Column).ListView.Sorting = SortOrder.Descending
ElseIf sender.Columns.Item(e.Column).ListView.Sorting <> SortOrder.Ascending Then
sender.Columns.Item(e.Column).ListView.Sorting = SortOrder.Ascending
End If
End Sub