C# return、continue、break

return 终止当前进程 可用循环判断，验证，等功能    

 if (ew == v)
            {
                PublicControlLib.Class.PublicProperties.ShowSuccess(this, "请检查后提交！", 2000);
                return;
            }

continue  终止本次循环  进行下一次循环   用作在循环中进行筛选数据

   for(int a = 0;a <Fg1Count;a++)
            {
                if (FG1.Rows[a].DefaultCellStyle.BackColor == Color.Red) 
                   continue;
                if (FG1.Rows[a].Visible == false)
                   continue;
                   DataRow Crow = DTmain.NewRow();
                   Crow["唯一码"] =  FG1.Rows[a].Cells[1].Value.ToString();
                   Crow["价格"] =FG1.Rows[a].Cells[5].Value;
                   DTmain.Rows.Add(Crow);
            }

break 跳出当前的循环、继续进行外围的循环

 for (int a = 0; a < dataGridViewX1.Rows.Count; a++)
            {
                for (int b = 0; b < dataGridViewX1.Columns.Count; b++)
                {
                    if (dataGridViewX1.Rows[a].Cells[b].Value == "")
                    {
                        break;
                    }
                }
            }