我怎么能将DataGridView行拖放到彼此之下？

我有绑定List DataGridView ，我按“ myClass ”中的“ Priority ”属性对其进行排序。 所以我想将“ DataGridViewRow ”拖动到某个位置以更改它的“ Priority ”属性。

我怎么能“拖放”DataGridView行？ 以及如何处理？

Answer 1

我在MSDN上找到了这个代码示例

请注意以下事项：

1）。 必须将DataGridView属性AllowDrop设置为true（默认值为false）。

2）。 当DataGridView 不是数据绑定时，下面的示例开箱即用。 否则会抛出InvalidOperationException。 如果是数据绑定，则应该操纵DataSource中项目的顺序。

 private Rectangle dragBoxFromMouseDown; private int rowIndexFromMouseDown; private int rowIndexOfItemUnderMouseToDrop; private void dataGridView1_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(eX, eY)) { // Proceed with the drag and drop, passing in the list item. DragDropEffects dropEffect = dataGridView1.DoDragDrop( dataGridView1.Rows[rowIndexFromMouseDown], DragDropEffects.Move); } } } private void dataGridView1_MouseDown(object sender, MouseEventArgs e) { // Get the index of the item the mouse is below. rowIndexFromMouseDown = dataGridView1.HitTest(eX, eY).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(eX - (dragSize.Width / 2), eY - (dragSize.Height / 2)), dragSize); } else // Reset the rectangle if the mouse is not over an item in the ListBox. dragBoxFromMouseDown = Rectangle.Empty; } private void dataGridView1_DragOver(object sender, DragEventArgs e) { e.Effect = DragDropEffects.Move; } private void dataGridView1_DragDrop(object sender, DragEventArgs e) { // The mouse locations are relative to the screen, so they must be // converted to client coordinates. Point clientPoint = dataGridView1.PointToClient(new Point(eX, eY)); // Get the row index of the item the mouse is below. rowIndexOfItemUnderMouseToDrop = dataGridView1.HitTest(clientPoint.X, clientPoint.Y).RowIndex; // If the drag operation was a move then remove and insert the row. if (e.Effect== DragDropEffects.Move) { DataGridViewRow rowToMove = e.Data.GetData( typeof(DataGridViewRow)) as DataGridViewRow; dataGridView1.Rows.RemoveAt(rowIndexFromMouseDown); dataGridView1.Rows.Insert(rowIndexOfItemUnderMouseToDrop, rowToMove); } }