拖拽改变DataGridView的行顺序
DataGridView并没有属性可以设置改变行顺序，需要做如下操作，假设改变dataGridView2的行顺序,
定义全局变量记录最后一次选中的行号:
int selectionIdx = 0;
在DragEnter事件中添加如下代码：
private void dataGridView2_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
在CellMouseMove事件中添加如下代码：
private void dataGridView2_CellMouseMove(object sender, DataGridViewCellMouseEventArgs e)
{
if ((e.Clicks < 2) && (e.Button == MouseButtons.Left))
{
if ((e.ColumnIndex == -1) && (e.RowIndex > -1))
dataGridView2.DoDragDrop(dataGridView2.Rows[e.RowIndex], DragDropEffects.Move);
}
}
在DragDrop事件中添加如下代码：
private void dataGridView2_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));
dataGridView2.Rows.Remove(row);
selectionIdx = idx;
dataGridView2.Rows.Insert(idx, row);
}
}
private int GetRowFromPoint(int x, int y)
{
for (int i = 0; i < dataGridView2.RowCount; i++)
{
Rectangle rec = dataGridView2.GetRowDisplayRectangle(i, false);
if (dataGridView2.RectangleToScreen(rec).Contains(x, y))
return i;
}
return -1;
}
在RowsAdded事件中添加如下代码：
private void dataGridView2_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
if (selectionIdx > -1)
{
dataGridView2.Rows[selectionIdx].Selected = true;
dataGridView2.CurrentCell = dataGridView2.Rows[selectionIdx].Cells[0];
}
}
通过上面的设置即可完成拖动来改变行顺序。
注意:此方法要求dataGridView2数据不能是绑定的，必须是静态添加进去的。
可以通过如下方式给添加数据：
dataGridView2.Rows.Clear();
StringBuilder sql = new StringBuilder();
sql.Append("select * from BAS_UserStandard ");
DataTable dt = SqlProxy.GetData(sql.ToString());
if (dt.Rows.Count > 0)
{
int N = dt.Columns.Count;
for (int col_index = 0; col_index < N; col_index++)
{
dataGridView2.Columns.Add(dt.Columns[col_index].ColumnName, dt.Columns[col_index].ColumnName);
}
foreach (DataRow item in dt.Rows)
{
int index = dataGridView2.Rows.Add();
for (int col_index = 0; col_index < N; col_index++)
{
dataGridView2.Rows[index].Cells[col_index].Value = item[col_index];
}
}
}