我有一个带有列表框和树视图的 winform.
I have a winform with a listbox and a treeview.
一旦我的列表框充满了项目,我想将它们(多个或单个)从列表框中拖放到树视图中的一个节点中.
Once my listbox is filled with items, I want to drag them (multiple or single) from the listbox and drop them in a node in the treeview.
如果有人在 C# 中有一个很好的例子,那就太好了.
If somebody has a good example in C# that would be great.
我已经有一段时间没有搞乱拖放了,所以我想我会写一个快速的示例.
It's been a while since I've messed with Drag/Drop so I figured I'll write a quick sample.
基本上,我有一个表单,左侧是列表框,右侧是树视图.然后我在上面放了一个按钮.单击按钮时,它只是将接下来十天的日期放入列表框中.它还使用 2 个父节点和两个子节点填充 TreeView.然后,您只需处理所有后续的拖放事件即可使其正常工作.
Basically, I have a form, with a listbox on the left, and a treeview on the right. Then I put a button on top. When the button is clicked, it just puts the date of the next ten days into the list box. It also populates the TreeView with 2 parents nodes and two child nodes. Then, you just have to handle all the subsequent drag/drop events to make it work.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.treeView1.AllowDrop = true;
this.listBox1.AllowDrop = true;
this.listBox1.MouseDown += new MouseEventHandler(listBox1_MouseDown);
this.listBox1.DragOver += new DragEventHandler(listBox1_DragOver);
this.treeView1.DragEnter += new DragEventHandler(treeView1_DragEnter);
this.treeView1.DragDrop += new DragEventHandler(treeView1_DragDrop);
}
private void button1_Click(object sender, EventArgs e)
{
this.PopulateListBox();
this.PopulateTreeView();
}
private void PopulateListBox()
{
for (int i = 0; i <= 10; i++)
{
this.listBox1.Items.Add(DateTime.Now.AddDays(i));
}
}
private void PopulateTreeView()
{
for (int i = 1; i <= 2; i++)
{
TreeNode node = new TreeNode("Node" + i);
for (int j = 1; j <= 2; j++)
{
node.Nodes.Add("SubNode" + j);
}
this.treeView1.Nodes.Add(node);
}
}
private void treeView1_DragDrop(object sender, DragEventArgs e)
{
TreeNode nodeToDropIn = this.treeView1.GetNodeAt(this.treeView1.PointToClient(new Point(e.X, e.Y)));
if (nodeToDropIn == null) { return; }
if(nodeToDropIn.Level > 0)
{
nodeToDropIn = nodeToDropIn.Parent;
}
object data = e.Data.GetData(typeof(DateTime));
if (data == null) { return; }
nodeToDropIn.Nodes.Add(data.ToString());
this.listBox1.Items.Remove(data);
}
private void listBox1_DragOver(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void treeView1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
this.listBox1.DoDragDrop(this.listBox1.SelectedItem, DragDropEffects.Move);
}
}
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