我做的计算机器的/，*，-，+一直按下去的话，它会一直在运算的，可是真正的计算机器不是这样的啊，我的运算符的代码是这样的，帮我看看啊，大侠们
 private void Oper_Click(object sender, EventArgs e)
        {
           
            this.curVal = float.Parse(this.textBox1.Text);
            this.append = false；   
           
            if (this.preOper == null)
            {
                this.preOper = ((Button)sender).Text;
                this.prevVal = curVal;

                return;
            }
         
            switch (this.preOper)
            {
                case "+": this.prevVal += this.curVal; break;
                case "-": this.prevVal -= this.curVal; break;
                case "*": this.prevVal *= this.curVal; break;
                case "/": this.prevVal /= this.curVal; break;
               
                default: break;
            }
           
            this.textBox1.Text = this.prevVal.ToString();
            
                       this.preOper = ((Button)sender).Text;
                        
        }

要多用几次计算器。它的算法很有规律的，要弄清楚先前的数和现在的数。还要记下操作符。