Dim lvw1 As WinForm.ListView = e.Form.Controls("ListView1") \'员工列表
Dim lvw2 As WinForm.ListView = e.Form.Controls("ListView2") \'活动一参与者列表
Dim lvw3 As WinForm.ListView = e.Form.Controls("ListView3") \'活动二参与者列表
Dim lvws() As Winform.ListView = {lvw1,lvw2,lvw3} \'看看我们是怎样批量设置某组控件属性的
For Each lvw As WinForm.ListView In lvws
    lvw.View = ViewMode.List
    lvw.AllowDrag = True
    lvw.AllowDrop = True
    lvw.Images.AddSmallImage("Man", "Man.ico") \'添加代表男性的一对图标
    lvw.Images.AddSmallImage("Woman", "Woman.ico") \'添加代表女性的一对图标
Next
For Each dr As DataRow In DataTables("员工").Select("","性别") \'列出所有员工
    Dim vr As WinForm.ListViewRow = lvw1.Rows.Add()
    vr.Text = dr("姓名")
    vr.Name = dr("姓名") \'将ListViewRow的Name属性设置为员工姓名
    If dr("性别") = "男" Then
        vr.ImageKey = "Man"
    Else
        vr.ImageKey = "Woman"
    End If
Next
Dim nms() As String = DataTables("活动").DataRows(0)("参与者").Split(",") \'列出活动一参与者
For Each nm As String In nms
    If nm > "" Then
        Dim vr As WinForm.ListViewRow = lvw2.Rows.Add()
        vr.Text = nm
        vr.Name = nm
        vr.ImageKey = lvw1.Rows(nm).ImageKey  \'从员工列表(ListView1)获取此员工的图标键值
    End If
Next
nms = DataTables("活动").DataRows(1)("参与者").Split(",") \'列出活动二参与者
For Each nm As String In nms
    If nm > "" Then
        Dim vr As WinForm.ListViewRow = lvw3.Rows.Add()
        vr.Text = nm
        vr.Name = nm
        vr.ImageKey = lvw1.Rows(nm).ImageKey \'从员工列表(ListView1)获取此员工的图标键值
    End If
Next

Dim lvw As WinForm.ListView = e.Sender
If lvw.Rows.Count >= 3  AndAlso e.Source.Name <> lvw.Name Then \'如果已经有三人,而且是从其他ListView拖动过来.
    Messagebox.show("每项活动最多允许三人参与!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    e.Cancel = True \'取消本次拖动
    Return
End If
If e.Source.Name =  "ListView1" \'如果是从员工列表中拖过来的行
    e.Delete = False \'不要删除原来的项目
End If
Dim itm As WinForm.ListViewRow =  e.Source.Rows(e.OldIndex) \'获取要拖动过来的行
If e.Source.Name <> e.Sender.Name Then \'如果是从其他ListView中拖动过来的
    If e.Sender.Rows.Contains(itm.Name) \'判断活动一是否已经包括此员工
        MessageBox.Show("此员工已经报名参加活动一,无需重复报名!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
        e.Cancel = True \'取消本次拖动
    End If
End If