Question

VB Listview 前面有Checkbox 怎样判断"没有选中任何项",即前面勾勾都没有被勾上,一项也没有!

Answer 1

可参考下面例子，有选中项时分别列出选中项名称，无选中项时，显示“无选中项”

Private Sub ListView1_ItemChecked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckedEventArgs) Handles ListView1.ItemChecked
Dim txt As String = Nothing
For Each listitem As ListViewItem In ListView1.Items
If listitem.Checked Then
txt += listitem.Text + ","
End If
Next
If txt = Nothing Then
TextBox1.Text = "没有选中项"
Else
TextBox1.Text = txt
End If

End Sub

Answer 2

用循环，然后判断Listview.ListItems(i).Checked = True是否选中

Answer 3

ListViewMain.SelectedIndex

当它为－1时，表示没有选中，大于－1时表示已经选择