Question

我有一个树视图和2个按钮我想点击UP_button，如果我点击DOWN_button选择节点上面那么选择应该下去

Answer 1

private void SelectNode(TreeNode node)
{
    if(node.IsSelected)
    {
        // Determine which TreeNode to select.
        switch(myComboBox.Text)
        {
            case "Previous":
                node.TreeView.SelectedNode = node.PrevNode;
                break;
            case "PreviousVisible":
                node.TreeView.SelectedNode = node.PrevVisibleNode;
                break;
            case "Next":
                node.TreeView.SelectedNode = node.NextNode;
                break;
            case "NextVisible":
                node.TreeView.SelectedNode = node.NextVisibleNode;
                break;
            case "First":
                node.TreeView.SelectedNode = node.FirstNode;
                break;
            case "Last":
                node.TreeView.SelectedNode = node.LastNode;
                break;
        }
    }
    node.TreeView.Focus();
}

修改
您当然会在按钮单击处理程序中使用“Previous”和“Next”或“PreviousVisible”和“NextVisible”的情况。此代码假定您从组合框中选择“操作”并按下按钮。

编辑2
如果您尝试上下移动节点（而不是选择），您可以使用以下内容：

TreeNode sourceNode = treeView.SelectedNode; if (sourceNode.Parent == null) { return; } treeView.Nodes.Remove(sourceNode); treeView.Nodes.Insert(sourceNode.Index + 1, sourceNode);

这会将当前节点向下移动一个。请注意，您必须编写更多代码来处理一些特殊情况（例如，第一个节点会发生什么？它是否适用于树的所有级别？），但基本上我会尝试这样做。

Answer 2

您可以使用节点的一些不错的内置属性，因此，您可以使用：

TreeView.SelectedNode = TreeView.SelectedNode.PrevNode;

和下来：

TreeView.SelectedNode = TreeView.SelectedNode.NextNode;

Answer 3

尝试UP：

    private void btnUP_Click(object sender, EventArgs e)
    {
        var tn = tv.SelectedNode;
        if(tn==null) return;

        var idx = tn.Index;
        txt.Text = "Node: " + idx;

        var par = tn.Parent;

        if(par==null) return;

        par.Nodes.Remove(tn);

        if (idx > 0)
        {
            par.Nodes.Insert(tn.Index - 1, tn);
            return;
        }

        //if you want to move int its parent's parent [grand parent :) ]
        if (par.Parent!=null)
            par.Parent.Nodes.Add(tn);
    }

Answer 4

我的问题解决了。
thanx答案

private void button1_Click(object sender, EventArgs e)
{
  TreeNode node = new TreeNode();
  node = treeView1.SelectedNode;
  treeView1.SelectedNode = node.NextVisibleNode;
  node.TreeView.Focus();
}

Answer 5

对于ASP.NET Treeview：

    /// <summary>
    /// MoveComponentUpLinkButton_Click
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void MoveComponentUpLinkButton_Click(object sender, EventArgs e)
    {
        // Get the selected node
        TreeNode sourceNode = this.MyTreeview.SelectedNode;
        if (sourceNode != null)
        {
            // Get the selected node's parent
            TreeNode parentNode = this.MyTreeview.SelectedNode.Parent;
            if (parentNode != null)
            {
                int index = -1;

                // For each node in selected nodes parent
                for (int j = 0; j < parentNode.ChildNodes.Count; j++)
                {
                    // If we found the selected node
                    if (sourceNode == parentNode.ChildNodes[j])
                    {
                        // save index
                        index = j;
                        break;
                    }
                }

                // If node is not already at top of list
                if (index > 0)
                {
                    // Move it up
                    parentNode.ChildNodes.RemoveAt(index);
                    parentNode.ChildNodes.AddAt(index - 1, sourceNode);
                    sourceNode.Selected = true;
                }
            }
        }
    }

    /// <summary>
    /// MoveComponentDownLinkButton_Click
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void MoveComponentDownLinkButton_Click(object sender, EventArgs e)
    {
        // Get the selected node
        TreeNode sourceNode = this.MyTreeview.SelectedNode;
        if (sourceNode != null)
        {
            // Get the selected node's parent
            TreeNode parentNode = this.MyTreeview.SelectedNode.Parent;
            if (parentNode != null)
            {
                int index = -1;

                // For each node in selected nodes parent
                for (int j = 0; j < parentNode.ChildNodes.Count; j++)
                {
                    // If we found the selected node
                    if (sourceNode == parentNode.ChildNodes[j])
                    {
                        // save index
                        index = j;
                        break;
                    }
                }

                // If node is not already at botton of list
                if (index < parentNode.ChildNodes.Count - 1)
                {
                    // Move it down
                    parentNode.ChildNodes.RemoveAt(index);
                    parentNode.ChildNodes.AddAt(index + 1, sourceNode);
                    sourceNode.Selected = true;
                }
            }
        }
    }

如何在c＃中以树形视图编程方式向上移动选定项目？

5 个答案: