判断dataGridView是否重复值

string[] com = new string[dgvRegisterdType.RowCount];
            for (int i = 0; i < dgvRegisterdType.RowCount; i++)
            {
                com[i] = dgvRegisterdType.Rows[i].Cells["clinic_type"].Value.ToString();
            }
            if (com.Distinct().Count() != com.Length)
            {
                MessageBox.Show("不允许有相同号类！", "提示");
                return;
            }string[] com = new string[dgvRegisterdType.RowC