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   源码介绍

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使用MVVM设计模式设计的计算器示例

private void OperationNum(string s)
        {
            if (jiguo.Text != "")
            {
                switch (anxia)
                {
                    case "":
                        resultnum = double.Parse(jiguo.Text);
                        anxia = s;
                        break;
                    case " ":
                        resultnum = resultnum double.Parse(jiguo.Text);
                        anxia = s;
                        break;
                    case "-":
                        resultnum = resultnum - double.Parse(jiguo.Text);
                        anxia = s;
                        break;
                    case "*":
                        resultnum = resultnum * double.Parse(jiguo.Text);
                        anxia = s;
                        break;
                    case "/":
                        if (double.Parse(jiguo.Text) != 0.0)
                        {
                            resultnum = resultnum / double.Parse(jiguo.Text);
                        }
                        else
                        {
                            resultnum = 0.0;
                        }
                        anxia = s;
                        break;
                    default: break;
                }
            }
            else
            {
                anxia = s;
            }
        }