WinForm拖放数据插入到文本光标位置

示例说明

将ListBox一行数据拖到TextBox中指定光标位置。涉及事件有：

• ListBox的MouseDown，用于鼠标单击选中数据
• TextBox的DragEnter，用鼠标将数据拖到TextBox时发生，复制数据
• TextBox的DragDrop，鼠标拖放完成时发生，粘贴插入数据

示例代码

private void ListBox_MouseDown(object sender, MouseEventArgs e)
{
    var index = lb.IndexFromPoint(e.X, e.Y);
    var item = lb.Items[index].ToString();
    txt.DoDragDrop(item, DragDropEffects.Copy);
}

private void TextBox_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Copy;
}

private void TextBox_DragDrop(object sender, DragEventArgs e)
{
    var point = tx.PointToClient(new Point(e.X, e.Y));
    var data = e.Data.GetData(typeof(string)) as string;
    txt.Text = txt.Text.Insert(txt.SelectionStart, data);
}