c# - 在DataGridView之间拖放

我已经复制了一些代码并对其进行了修改以适合我的应用程序。并且我将继续调整和清理代码，直到对其进行统计。但是我遇到了一个小错误。我有两个datagridviews，希望将datagridrows从一个移到另一个。但是，当drag&drop事件全部触发时，由于dataGridView_Routes_DragDrop()中没有数据，所以e.Data.GetData将执行log命令。我做错了什么？我想念什么吗？我尝试浏览了几本指南，但没有任何内容专门涵盖此问题。

如何使数据网格将拖动的数据网格传递到其他数据网格？

    /* Drag & Drop */
    private Rectangle dragBoxFromMouseDown;
    private int rowIndexFromMouseDown;
    private void dataGridView_Trips_MouseMove(object sender, MouseEventArgs e)
    {
        if ((e.Button & MouseButtons.Left) == MouseButtons.Left)
        {
            // If the mouse moves outside the rectangle, start the drag.
            if (dragBoxFromMouseDown != Rectangle.Empty && !dragBoxFromMouseDown.Contains(e.X, e.Y))
            {
                // Proceed with the drag and drop, passing in the list item.
                DragDropEffects dropEffect = dataGridView_Trips.DoDragDrop(dataGridView_Trips.Rows[rowIndexFromMouseDown], DragDropEffects.Copy);
            }
        }
    }

    private void dataGridView_Trips_MouseDown(object sender, MouseEventArgs e)
    {
        // Get the index of the item the mouse is below.
        rowIndexFromMouseDown = dataGridView_Trips.HitTest(e.X, e.Y).RowIndex;
        if (rowIndexFromMouseDown != -1)
        {
            // Remember the point where the mouse down occurred.
            // The DragSize indicates the size that the mouse can move
            // before a drag event should be started.
            Size dragSize = SystemInformation.DragSize;

            // Create a rectangle using the DragSize, with the mouse position being
            // at the center of the rectangle.
            dragBoxFromMouseDown = new Rectangle(new Point(e.X - (dragSize.Width / 2), e.Y - (dragSize.Height / 2)), dragSize);
        }
        else
            // Reset the rectangle if the mouse is not over an item in the ListBox.
            dragBoxFromMouseDown = Rectangle.Empty;
    }

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

    private void dataGridView_Routes_DragDrop(object sender, DragEventArgs e)
    {
        if (e.Data.GetDataPresent(typeof(DataRowView)))
        {
            // The mouse locations are relative to the screen, so they must be
            // converted to client coordinates.
            Point clientPoint = dataGridView_Routes.PointToClient(new Point(e.X, e.Y));

            // If the drag operation was a copy then add the row to the other control.
            if (e.Effect == DragDropEffects.Copy)
            {
                DataGridViewRow rowToMove = e.Data(typeof(DataGridViewRow)) as DataGridViewRow;
                dataGridView_Routes.Rows.Add(rowToMove);
            }
        }
        else
        {
            log("Geen data! #01", "Fout");
        }
    }
    /* End Drag & Drop */

最佳答案

此解决方案适用于将datagridViews绑定到customObjects的人员。它可以像多种选择一样吸引人。建议被接受。

假设您要从datagridview1拖到datagridview2

//datagridview1 is bound to this BindingList
BindingList<myObject> object_bound_list1;

//datagridview2 is bound to this BindingList
BindingList<myObject> object_bound_list2;

List<myObject> selected_Object_list = new List<myObject>();
List<int> selected_pos_list = new List<int>();

private void dataGridView1_MouseMove(object sender, MouseEventArgs e)
{
    if ((e.Button & MouseButtons.Left) == MouseButtons.Left)
    {
        // Proceed with the drag and drop, passing in the list item.
        DragDropEffects dropEffect = dataGridView1.DoDragDrop(
        selected_Object_list,
        DragDropEffects.Move);
    }
}

private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
    // Get the index of the item the mouse is below.
    int rowIndexFromMouseDown = dataGridView1.HitTest(e.X, e.Y).RowIndex;

    //if shift key is not pressed
    if (Control.ModifierKeys != Keys.Shift && Control.ModifierKeys != Keys.Control)
    {
        //if row under the mouse is not selected
        if (!selected_pos_list.Contains(rowIndexFromMouseDown) && rowIndexFromMouseDown > 0)
        {
        //if there only one row selected
            if (dataGridView1.SelectedRows.Count == 1)
            {
                //select the row below the mouse
                dataGridView.ClearSelection();
                dataGridView1.Rows[rowIndexFromMouseDown].Selected = true;
            }
        }
    }

    //clear the selection lists
    selected_Object_list.Clear();
    selected_pos_list.Clear();

    //add the selected objects
    foreach (DataGridViewRow row in dataGridView1.SelectedRows)
    {
        selected_Object_list.Add(object_bound_list1[row.Index]);
        selected_pos_list.Add(row.Index);
    }
}

private void dataGridView2_DragOver(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Move;
}

private void dataGridView2_DragDrop(object sender, DragEventArgs e)
{
    if (e.Effect == DragDropEffects.Move)
    {
        foreach (var item in selected_Object_list)
        {
            object_bound_list2.Add(item);
        }
    }
}

关于c# - 在DataGridView之间拖放，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14199510/