[英]How could I Drag and Drop DataGridView Rows under each other?
I've DataGridView
that bound a List<myClass>
and i sort it by " Priority
" property in " myClass
". 我有一个绑定List<myClass>
DataGridView
,我按“ myClass
”中的“ Priority
”属性对其进行排序。 So I want to drag an " DataGridViewRow
" to certain position to change it's " Priority
" property. 所以我想将“ DataGridViewRow
”拖动到某个位置以更改它的“ Priority
”属性。
How could I "Drag & Drop" DataGridView Rows ?. 我怎么能“拖放”DataGridView行? And how to handle this ?. 以及如何处理这个?
I found this code sample on MSDN 我在MSDN上找到了这个代码示例
Note the following: 请注意以下事项:
1). 1)。 DataGridView property AllowDrop must be set to true (default is false). 必须将DataGridView属性AllowDrop设置为true(默认值为false)。
2). 2)。 The example below works out of the box when the DataGridView is NOT data-bound. 当DataGridView 不是数据绑定时,下面的示例开箱即用。 Otherwise it will throw an InvalidOperationException. 否则会抛出InvalidOperationException。 If it is databound, you should manipulate the order of items in the DataSource
. 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(e.X, e.Y))
{
// 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(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 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(e.X, e.Y));
// 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);
}
}
The Answer from 'Wahid Bitar' helped me a lot. 来自'Wahid Bitar'的答案对我帮助很大。 I cannot comment the above, so a small addition: If deleting a row is unwanted as commented by 'neminem': Just add to DragDrop Event just before the lines that finally moves it: 我不能评论上面的内容,所以一个小小的补充:如果删除行是不需要的'neminem'注释:只需在最终移动它的行之前添加到DragDrop事件:
if (rowIndexOfItemUnderMouseToDrop < 0 )
{
return;
}
dataGridView1.Rows.RemoveAt(rowIndexFromMouseDown);
dataGridView1.Rows.Insert(rowIndexOfItemUnderMouseToDrop, rowToMove);
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