ListView是VB.Net很重要的一个控件。但是如何针对某一个Column排序，如何实现点击Column排序，CLR并没有提供相关方法。
今天，我们来实现这个功能。
首先，我们给项目里新建一个类，名字取如：“ColumnSort.vb”即可，然后添加如下代码：
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Public Class ColumnSort : Implements IComparer Private columnNum As Integer = 0 Public bAscending As Boolean = True Public Sub New(ByVal column_to_sort As Integer) columnNum = column_to_sort End Sub Private Function CompareInt(ByVal x As Integer, ByVal y As Integer) As Integer If x > y Then Return 1 ElseIf x < y Then Return -1 Else Return 0 End If End Function Public Function Compare(ByVal a As Object, ByVal b As Object) As Integer Implements IComparer.Compare Dim listItemA As System.Windows.Forms.ListViewItem = DirectCast(a, System.Windows.Forms.ListViewItem) Dim listItemB As System.Windows.Forms.ListViewItem = DirectCast(b, System.Windows.Forms.ListViewItem) Dim xText As String = listItemA.SubItems(columnNum).Text Dim yText As String = listItemB.SubItems(columnNum).Text Dim xInt As Integer, yInt As Integer If bAscending Then If Integer.TryParse(xText, xInt) AndAlso Integer.TryParse(yText, yInt) Then Return CompareInt(xInt, yInt) Else Return [String].Compare(xText, yText) End If Else If Integer.TryParse(xText, xInt) AndAlso Integer.TryParse(yText, yInt) Then Return -1 * CompareInt(xInt, yInt) Else Return -1 * [String].Compare(xText, yText) End If End If End Function End Class |
然后在ListView的ColumnClick事件中添加如下代码：
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'将ListView1改为自己的ListView的名字 Dim columnsort As New ColumnSort(e.Column) columnsort.bAscending = (ListView1.Sorting = SortOrder.Ascending) If columnsort.bAscending Then ListView1.Sorting = SortOrder.Descending Else ListView1.Sorting = SortOrder.Ascending End If ListView1.ListViewItemSorter = columnsort ListView1.ListViewItemSorter = Nothing |
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