operationfactory.cs

C#计算器 用来计算简单的小计算！

using System;
using System.Collections.Generic;
using System.Text;

namespace Calculator
{
    /// <summary>
    /// 简单工厂
    /// 根据条件，创建对象
    /// </summary>
    public class OperationFactory
    {
        public static Operation CreateOperation(string operate)
        {
            Operation o = null;
            switch(operate)
            {
                case "+":
                    o = new OperationAdd();
                    break;
                case "-":
                    o = new OperationSub();
                    break;
                case "*":
                    o = new OperationMul();
                    break;
                case "/":
                    o = new OperationDiv();
                    break;
                case "sqrt":
                    o = new OperationSqrt();
                    break;
                case "squa":
                    o = new OperationSqua();
                    break;
                case "%":
                    o = new OperationDivRem();
                    break;
                case "rec":
                    o = new OperationRec();
                    break;
            }
            return o;
        }
    }
}