大佬教程收集整理的这篇文章主要介绍了如何缩短以下C#if语句？，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
交换机是否可以采用这种方式？
static String RevisedConversionFunction(String input,String from,String to) { double exchangeRateUSD; double exchangeRateAUD; double exchangeRateCAD; double exchangeRateEUR; double exchangeRateGBP; double exchangeRateNZD; double fromExchangeRate; double toExchangeRate; exchangeRateUSD = 1; exchangeRateAUD = 1.31; exchangeRateCAD = 1.28; exchangeRateEUR = 0.95; exchangeRateGBP = 0.68; exchangeRateNZD = 1.36; fromExchangeRate = 0; toExchangeRate = 0; if (from.Equals("USD")) { fromExchangeRate = exchangeRateUSD; } if (from.Equals("AUD")) { fromExchangeRate = exchangeRateAUD; } if (from.Equals("CAD")) { fromExchangeRate = exchangeRateCAD; } if (from.Equals("EUR")) { fromExchangeRate = exchangeRateEUR; } if (from.Equals("GBP")) { fromExchangeRate = exchangeRateGBP; } if (from.Equals("NZD")) { fromExchangeRate = exchangeRateNZD; } if (to.Equals("USD")) { toExchangeRate = exchangeRateUSD; } if (to.Equals("AUD")) { toExchangeRate = exchangeRateAUD; } if (to.Equals("CAD")) { toExchangeRate = exchangeRateCAD; } if (to.Equals("EUR")) { toExchangeRate = exchangeRateEUR; } if (to.Equals("GBP")) { toExchangeRate = exchangeRateGBP; } if (to.Equals("NZD")) { toExchangeRate = exchangeRateNZD; } double amount; Double.TryParse(input,out amount); amount = (amount / fromExchangeRatE) * toExchangeRate; amount = Math.round(amount,2); String result = Convert.ToString(amount); return result; }
我不熟悉交换机,但有没有办法可以在这种情况下使用它们？
提前致谢,
马特
编辑 – 编辑 – 编辑 – 编辑 – 编辑
谢谢大家的意见.
static String RevisedConversionFunction(String input,String to) { //Exchange Rates Dictionary<String,double> rates = new Dictionary<String,double>(); rates.Add("USD",1); rates.Add("AUD",1.31); rates.Add("CAD",1.28); rates.Add("EUR",0.95); rates.Add("GBP",0.68); rates.Add("NZD",1.36); //Conversion double amount; Double.TryParse(input,out amount); return Convert.ToString(Math.round(((amount / rates[from]) * rates[to]),2)); }
码：
static String RevisedConversionFunction(String input,String to) { Dictionary<String,decimal> dExchange = new Dictionary<String,decimal>() { {"USD",1},{"AUD",1.31m},{"CAD",1.28m},{"EUR",0.95m},{"GBP",0.68m},{"NZD",1.36m} }; if (dExchange.ContainsKey(from) && dExchange.ContainsKey(to)) { return Math.round((decimal.Parse(input) / dExchange[from]) * dExchange[to],2).ToString(); } else { // at least one currency not in the Dictionary - exception handling? return null; } }
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