VB.NET 给DataGrid加上右键菜单

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代码如下:

Dim fileName As String
Dim MyXmlDataSet As New DataSet
fileName = "sunhai.xml"
MyXmlDataSet.ReadXml(fileName)
Form1.DefInstance.DataGrid1.DataSource = MyXmlDataSet 

  启动程序,DataTable默认是闭合的,需要手动点击展开,不胜其烦,用如下代码实现自动展开DataTable:

Private Sub Form1_Load(ByVal sender As Object,ByVal e As System.EventArgs) Handles MyBase.Load

  DataGrid1.Expand(-1) '要展开的行数,设为-1表示展开所有行
  DataGrid1.NavigateTo(0,"DataTableName") 

End Sub

  获得在DataGrid1鼠标右击的座标

Dim rowNum,columnNum As Integer '分别是行号和列号 
Private Sub DataGrid1_MouseDown(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGrid1.MouseDown
Dim myGrid As DataGrid = CType(sender,DataGrid)
Dim hti As System.Windows.Forms.DataGrid.HitTestInfo
hti = myGrid.HitTest(e.X,e.Y)

If e.Button = MouseButtons.Right And e.Clicks = 1 Then '如果是鼠标右击 
     Select Case hti.Type '
       Case System.Windows.Forms.DataGrid.HitTestType.Cell,System.Windows.Forms.DataGrid.HitTestType.RowHeader, System.Windows.Forms.DataGrid.HitTestType.ColumnHeader
        rowNum = hti.Row     '获得鼠标右击所在行
        columnNum = hti.Column '获得鼠标右击所在列
     End Select
  End If
End Sub

添加ContextMenu

在设计模式添加ContextMenu1:
  Text      Name
  删除一行    mnuDeleteRow
  插入一行     mnuInsertRow

把DataGrid1属性中的ContextMenu设为ContextMenu1。

Private Sub mnuDeleteRow_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles mnuDeleteRow.Click

  MyXmlDataSet.Tables(0).Rows.RemoveAt(rowNum) '删除行

End Sub

Private Sub mnuInsertRow_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles mnuInsertRow.Click

  Dim row1 As DataRow = MyXmlDataSet.Tables(0).NewRow   MyXmlDataSet.Tables(0).Rows.InsertAt(row1,rowNum)   MyXmlDataSet.AcceptChanges()  '不加这句,你会发现所插入行都到“最后”了

End Sub

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