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我有一个使用 .net 框架 4.0 版的 ac# 项目，并在 VS 2010 上运行。我创建了一个填充了一些扩展树节点的树视图。我希望用户能够通过上下文菜单或键盘快捷键（而不仅仅是拖放）复制、剪切和粘贴这些节点到剪贴板。

复制时代码运行良好，但是当我尝试粘贴这些节点时，它会引发此错误：无法将“System.IO.MemoryStream”类型的对象转换为“Namespace Path.TreeNodeEx”类型。

这是我的剪切/复制/粘贴方法。

public void Copy()
{
    Clipboard.SetData("Tree Node Ex", CurrentTreeNode.Clone());
}


public void Paste()
{
    CurrentTreeNode.Nodes.Add((TreeNodeEx)Clipboard.GetData("Tree Node Ex"));
}

我怀疑问题与序列化有关，但我尝试实现 ISeralizable 接口和 [Serializable] 属性无济于事。

有什么建议么？

4

4 回答 4

1

事实证明，附加到每个扩展树节点我都有一个存储额外信息的字典。显然你不能序列化字典，所以这阻止了任何树节点被序列化。

我ISerializable为这些扩展的树节点实现，然后将字典转换为两个列表，然后我在反序列化构造函数中将其转换回字典。

于 2010-08-14T01:30:16.423 回答
0

试试这个：

Clipboard.GetDataObject().GetData(typeof(TreeNodeEx))
于 2010-08-11T12:30:02.957 回答
0 
public void copy()
{
tempNode = TreeView.SelectedNode;
}
public void paste()
{
TreeView.SelectedNode.Nodes.Add(new TreeNode(tempNode.Text));
            tNode = TreeView.SelectedNode.LastNode;
            for (int i = 0; i <= tempNode.Nodes.Count - 1; i++)
            {
                TreeNode NodeClone = (TreeNode)tempNode.Nodes[i].Clone();
                tNode.Nodes.Add(NodeClone);
            }
public void cut()
{
tempNode = TreeView.SelectedNode;
            TreeView.SelectedNode.Remove();
}
于 2015-04-06T08:49:25.653 回答
0

老东西，但我花了几个小时面对同样的问题，所以这里是有效的：

Imports System.Runtime.Serialization

Public Class Form1

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load
    Me.TV.Nodes.Clear()
    Dim tNode As New TemplateNode()
    Me.TV.Nodes.Add(tNode)
    For i As Integer = 1 To 5
        Dim newNode As New TemplateNode()
        tNode.Nodes.Add(newNode)
        tNode = newNode
    Next
    Me.TV.ExpandAll()
End Sub


Private Sub TV_ItemDrag(sender As Object, e As ItemDragEventArgs) Handles TV.ItemDrag
    DoDragDrop(Me.TV.SelectedNode, DragDropEffects.Copy + DragDropEffects.Move + DragDropEffects.Scroll)
End Sub
Private Sub TV_DragEnter(sender As Object, e As DragEventArgs) Handles TV.DragEnter
    e.Effect = DragDropEffects.Move
End Sub
Private Sub TV_DragOver(sender As Object, e As DragEventArgs) Handles TV.DragOver
    e.Effect = DragDropEffects.Move
    If (e.KeyState And 8) = 8 Then
        e.Effect += DragDropEffects.Copy
    End If
End Sub
Private Sub TV_DragDrop(sender As Object, e As DragEventArgs) Handles TV.DragDrop
    Dim TemplateNode As TemplateNode = e.Data.GetData(GetType(TemplateNode))
    Me.TV.Nodes.Add(TemplateNode.Clone())
End Sub


Private Sub bCopy_Click(sender As Object, e As EventArgs) Handles bCopy.Click
    My.Computer.Clipboard.SetData("TemplateNode", Me.TV.SelectedNode)
End Sub
Private Sub bCut_Click(sender As Object, e As EventArgs) Handles bCut.Click
    My.Computer.Clipboard.SetData("TemplateNode", Me.TV.SelectedNode)
    Me.TV.SelectedNode.Remove()
End Sub
Private Sub bPaste_Click(sender As Object, e As EventArgs) Handles bPaste.Click
    Dim TemplateNode As TemplateNode = My.Computer.Clipboard.GetData("TemplateNode")
    If Me.TV.SelectedNode Is Nothing Then
        Me.TV.Nodes.Add(TemplateNode)
    Else
        Me.TV.SelectedNode.Nodes.Add(TemplateNode)
    End If
End Sub

End Class


<Serializable()> _
Public Class TemplateNode
    Inherits TreeNode

Public MyString As String = "MyStringValue"
Public MyDateTime As DateTime = DateTime.Now
Public MyBytes() As Byte

Public Sub New()
    Dim buff(255) As Byte
    For i As Integer = 0 To buff.GetUpperBound(0)
        buff(i) = CByte(Rnd() * 100)
    Next
    Me.MyBytes = buff
    Me.Text = Guid.NewGuid().ToString()
End Sub
Protected Friend Sub New(info As SerializationInfo, context As StreamingContext)
    MyBase.New(info, context)
End Sub

End Class
于 2015-04-20T20:03:18.460 回答