始终使用 T.TryParse（string str，out T value） 。抛出异常的代价很高，如果可以 先验地
处理异常，则应避免抛出异常。使用try-
catch块来“节省”性能（因为无效数据速率较低）会滥用异常处理，但会牺牲可维护性和良好的编码习惯。遵循良好的软件工程开发实践，编写测试案例，运行应用程序，然后进行基准测试并进行优化。
“我们应该忘记效率低下的问题，大约有97％的时间是这样： 过早的优化是万恶之源 。但是，我们不应该在那3％的临界水平上放弃自己的机会。”
-Donald Knuth
因此，就像在碳信用额度中一样，您任意分配try-catch 的性能 较差 ，而TryParse的性能则 更好
。只有在运行了应用程序并确定我们有某种类型的wrt字符串解析速度减慢之后，我们才考虑使用TryParse以外的任何方法。
（编辑：由于提问者似乎希望定时数据与好的建议一起使用，因此这是请求的定时数据）
用户（对于非信徒）10,000个输入上的各种故障率的时间：
Failure Rate Try-Catch TryParse Slowdown 0%00:00:00.0131758 00:00:00.0120421 0.1 10%00:00:00.1540251 00:00:00.0087699 16.6 20%00:00:00.2833266 00:00:00.0105229 25.9 30%00:00:00.4462866 00:00:00.0091487 47.8 40%00:00:00.6951060 00:00:00.0108980 62.8 50%00:00:00.7567745 00:00:00.0087065 85.9 60%00:00:00.7090449 00:00:00.0083365 84.1 70%00:00:00.8179365 00:00:00.0088809 91.1 80%00:00:00.9468898 00:00:00.0088562 105.9 90%00:00:01.0411393 00:00:00.0081040 127.5100%00:00:01.1488157 00:00:00.0078877 144.6/// <param name="errorRate">Rate of errors in user input</param>/// <returns>Total time taken</returns>public static TimeSpan TimeTryCatch(double errorRate, int seed, int count){ Stopwatch stopwatch = new Stopwatch(); Random random = new Random(seed); string bad_prefix = @"X"; stopwatch.Start(); for(int ii = 0; ii < count; ++ii) { string input = random.Next().ToString(); if (random.NextDouble() < errorRate) {input = bad_prefix + input; } int value = 0; try { value = Int32.Parse(input); } catch(FormatException) { value = -1; // we would do something here with a logger perhaps } } stopwatch.Stop(); return stopwatch.Elapsed;}/// <param name="errorRate">Rate of errors in user input</param>/// <returns>Total time taken</returns>public static TimeSpan TimeTryParse(double errorRate, int seed, int count){ Stopwatch stopwatch = new Stopwatch(); Random random = new Random(seed); string bad_prefix = @"X"; stopwatch.Start(); for(int ii = 0; ii < count; ++ii) { string input = random.Next().ToString(); if (random.NextDouble() < errorRate) {input = bad_prefix + input; } int value = 0; if (!Int32.TryParse(input, out value)) { value = -1; // we would do something here with a logger perhaps } } stopwatch.Stop(); return stopwatch.Elapsed;}public static void TimeStringParse(){ double errorRate = 0.1; // 10% of the time our users mess up int count = 10000; // 10000 entries by a user TimeSpan trycatch = TimeTryCatch(errorRate, 1, count); TimeSpan tryparse = TimeTryParse(errorRate, 1, count); Console.WriteLine("trycatch: {0}", trycatch); Console.WriteLine("tryparse: {0}", tryparse);}
