如何在数据拖动的时候动态创建一个显示选中数据的label?我作了2个datagrid互相拖,要求选中数据以拖动,就出现一个背景为透明的label,显示选中的数据,知道拖到另一个datagrid的dragdrop的时候label消失?
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不是有dodragdrop的事件的嘛
Inherits System.Windows.Forms.Form#Region " Windows Form Designer generated code " Public Sub New()
MyBase.New() 'This call is required by the Windows Form Designer.
InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub 'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer 'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
Friend WithEvents DataGrid2 As System.Windows.Forms.DataGrid
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.DataGrid1 = New System.Windows.Forms.DataGrid
Me.DataGrid2 = New System.Windows.Forms.DataGrid
CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()
CType(Me.DataGrid2, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'DataGrid1
'
Me.DataGrid1.AllowDrop = True
Me.DataGrid1.DataMember = ""
Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText
Me.DataGrid1.Location = New System.Drawing.Point(48, 8)
Me.DataGrid1.Name = "DataGrid1"
Me.DataGrid1.Size = New System.Drawing.Size(280, 184)
Me.DataGrid1.TabIndex = 0
'
'DataGrid2
'
Me.DataGrid2.AllowDrop = True
Me.DataGrid2.DataMember = ""
Me.DataGrid2.HeaderForeColor = System.Drawing.SystemColors.ControlText
Me.DataGrid2.Location = New System.Drawing.Point(48, 272)
Me.DataGrid2.Name = "DataGrid2"
Me.DataGrid2.Size = New System.Drawing.Size(272, 208)
Me.DataGrid2.TabIndex = 1
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 12)
Me.ClientSize = New System.Drawing.Size(480, 534)
Me.Controls.Add(Me.DataGrid2)
Me.Controls.Add(Me.DataGrid1)
Me.Name = "Form1"
Me.Text = "Form1"
CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()
CType(Me.DataGrid2, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False) End Sub#End Region Dim dt As DataTable
Dim dt1 As DataTable
Dim s As String
Dim s1 As String
Dim dragLabel As New Label Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
dt = New DataTable
dt1 = New DataTable
Dim dc As New DataColumn("ds", GetType(String))
Dim dc1 As New DataColumn("ds", GetType(String))
dt.Columns.Add(dc)
dt1.Columns.Add(dc1) Dim dr1 As DataRow
Dim dr As DataRow dr = dt1.NewRow()
dr("ds") = ""
dt1.Rows.Add(dr) dr1 = dt.NewRow()
dr1("ds") = "111"
dt.Rows.Add(dr1) dr1 = dt.NewRow()
dr1("ds") = "222"
dt.Rows.Add(dr1) dr1 = dt.NewRow()
dr1("ds") = "33"
dt.Rows.Add(dr1) dr1 = dt.NewRow()
dr1("ds") = "444"
dt.Rows.Add(dr1) dr1 = dt.NewRow()
dr1("ds") = "555"
dt.Rows.Add(dr1) 'Dim dv As DataView
'dv = dt.DefaultView
'dv.AllowNew = False Me.DataGrid1.DataSource = dt
Me.DataGrid2.DataSource = dt1 dragLabel.Visible = True
dragLabel.BackColor = System.Drawing.Color.Blue
' dragLabel.BackColor = System.Drawing.Color.Transparent
dragLabel.Size = New System.Drawing.Size(72, 23) End Sub Private Sub DataGrid2_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid2.DragEnter
Me.DataGrid2.Select() End Sub Private Sub DataGrid2_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid2.DragEnter e.Effect = DragDropEffects.Copy Me.DataGrid2.Refresh() End Sub Private Sub DataGrid2_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid2.DragDrop
Me.dragLabel.Visible = False Dim i As Int16 = 1
Dim dr As DataRow
dr = dt1.Rows(Me.DataGrid2.CurrentCell.RowNumber)
dr(0) = s
dt1.Rows.Add(dr) End Sub Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
Dim s As String = Me.ActiveControl.Name
End Sub Private Sub DataGrid1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGrid1.MouseDown
Me.dragLabel.Visible = True
Me.dragLabel.Location = New System.Drawing.Point(e.X, e.Y)
Me.dragLabel.Text = s1 If e.Button = MouseButtons.Left Then
If Me.DataGrid1.CurrentCell.ColumnNumber < dt.Columns.Count _
Or Me.DataGrid1.CurrentCell.RowNumber < dt.Rows.Count _
Then
If dt.Rows.Count = Me.DataGrid1.CurrentCell.RowNumber Then
Else
s = dt.Rows(Me.DataGrid1.CurrentCell.RowNumber)(Me.DataGrid1.CurrentCell.ColumnNumber)
Me.DataGrid1.DoDragDrop(s, DragDropEffects.Copy)
End If
End If
End If
End Sub Private Sub DataGrid2_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGrid2.MouseDown
Me.dragLabel.Visible = True
Me.dragLabel.Location = New System.Drawing.Point(e.X, e.Y)
Me.dragLabel.Text = s1
If e.Button = MouseButtons.Left Then
If Me.DataGrid2.CurrentCell.ColumnNumber < dt1.Columns.Count _
Or Me.DataGrid2.CurrentCell.RowNumber < dt1.Rows.Count _
Then
s1 = dt1.Rows(Me.DataGrid2.CurrentCell.RowNumber)(Me.DataGrid2.CurrentCell.ColumnNumber)
If s1 <> "" Then
Me.DataGrid2.DoDragDrop(s, DragDropEffects.Move) End If
End If
End If End Sub Private Sub DataGrid1_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid1.DragDrop
Me.dragLabel.Visible = False
Dim i As Int16 = 1
Dim dr As DataRow
dt1.Rows(Me.DataGrid2.CurrentCell.RowNumber)(Me.DataGrid2.CurrentCell.ColumnNumber) = String.Empty
dr = dt.Rows(Me.DataGrid1.CurrentCell.RowNumber)
dr(0) = s1
dt.Rows.Add(dr) End Sub Private Sub DataGrid1_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid1.DragOver
e.Effect = DragDropEffects.Move Me.DataGrid1.Refresh() End Sub Private Sub DataGrid1_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles DataGrid1.DragEnter
Me.DataGrid1.Select()
End Sub
End Class
以上是我的代码,该如何加阿?