问如果选定的单元格在同一列中，请执行某些操作

EN

int columnIndex = dgvC.SelectedCells[0].ColumnIndex;
bool sameCol = true;
for(int i=0;i<dgvC.SelectedCells.Count;i++)
    {
        if(dgvC.SelectedCells[i].ColumnIndex != columnIndex)
         {
           sameCol = false;
           break;
          }
     }
 if (sameCol)
     {
       MessageBox.Show("Same Column");
     }
  else
     {
       MessageBox.Show("Not same column");
     }

    int columnIndex = dgvC.SelectedCells[0].ColumnIndex;
    if (dgvC.SelectedCells.Cast<DataGridViewCell>().Any(r => r.ColumnIndex != columnIndex))
    {
        //Not same
    }
    else
    {
        //Same
    }

if(dgvC.SelectedCells.Cast<DataGridViewCell>()
            .GroupBy(c => c.ColumnIndex).Count() == 1)
{
   foreach (DataGridViewCell c in dgvC.SelectedCells)
     //your code
}

        Boolean allCells = true;
        int colIndex = dgvC.SelectedCells[0].ColumnIndex;

        foreach (DataGridViewCell c in dgvC.SelectedCells)
        {
            if(c.ColumnIndex != colIndex)
            {
                allCells = false;
            }
        }

        if(allCells)
        {
            //do stuff here
        }