实现DataGridView行的拖动,即实现行的顺序交换
时间:2014-05-21 05:27:18
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1.界面准备
(1)首先在form中添加一个DataGridView控件,将默认AllowDrop=false 的属性设置为True,否侧不能拖动!
(2)对DataGridView的对象实现非数据源的绑定,因为设置DataSource属性即当控件被数据绑定时,无法以编程方式向
DataGridView 的行集合中添加行。
2.代码准备
(1)控制移动时鼠标的图形,否则是一个禁止移动的标识
private void dataGridView1_DragEnter(object
sender, DragEventArgs e)
{
e.Effect =
DragDropEffects.Move;
}
(2)控制拖动的条件,也可以自行放宽条件
private
void dataGridView1 _CellMouseMove(object sender,
DataGridViewCellMouseEventArgs e)
{
if ((e.Clicks < 2) &&
(e.Button == MouseButtons.Left))
{
if ((e.ColumnIndex
== -1) && (e.RowIndex > -1))
dataGridView1.DoDragDrop(dataGridView1.Rows[e.RowIndex],
DragDropEffects.Move);
}
}
(3)拖动后实现行的删除和添加,实现行交换位置的错觉
int selectionIdx = 0;
private
void dataGridView1_DragDrop(object sender, DragEventArgs e)
{
int idx = GetRowFromPoint(e.X,
e.Y);
if (idx < 0) return;
if
(e.Data.GetDataPresent(typeof(DataGridViewRow)))
{
DataGridViewRow row
= (DataGridViewRow)e.Data.GetData(typeof(DataGridViewRow));
dataGridView1.Rows.Remove(row);
selectionIdx =
idx;
dataGridView1.Rows.Insert(idx, row);
}
}
private int GetRowFromPoint(int x, int y)
{
for (int i = 0; i <
dataGridView1.RowCount; i++)
{
Rectangle rec =
dataGridView1.GetRowDisplayRectangle(i, false);
if
(dataGridView1.RectangleToScreen(rec).Contains(x, y))
return i;
}
return -1;
}
(4)控制被移动的行始终是选中行
private void
kryptonDataGridView1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs
e)
{
if (selectionIdx > -1)
{
dataGridView1.Rows[selectionIdx].Selected = true;
dataGridView1.CurrentCell = dataGridView1.Rows[selectionIdx].Cells[0];
}
}
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