TryCatch与TryParse的优缺点 [英] pros and cons of TryCatch versus TryParse

问题描述

使用以下两种方法中的一种来从对象中拉出双精度的利弊是什么?除了个人喜好以外，我正在寻找反馈的问题还包括调试的简易性，性能，可维护性等.

What are the pros and cons of using either of the following approaches to pulling out a double from an object? Beyond just personal preferences, issues I'm looking for feedback on include ease of debugging, performance, maintainability etc.

public static double GetDouble(object input, double defaultVal)
{
    try
    {
        return Convert.ToDouble(input);
     }
     catch
     {
        return defaultVal;
     }
}

public static double GetDouble(object input, double defaultVal)
{
    double returnVal;
    if (double.TryParse(input.ToString(), out returnVal))
    {
        return returnVal;
    }
else
    {
        return defaultVal;
    }
}

推荐答案

• TryParse将比捕获异常更快
• TryParse表示预期-这里没有发生任何异常情况，只是您怀疑您的数据可能无效.
• TryParse不在正常控制流中使用异常处理
• TryParse will be faster than catching an exception
• TryParse indicates something expected - nothing exceptional is happening here, it's just that you suspect your data may not be valid.
• TryParse isn't using exception handling for normal control flow

基本上，请使用TryParse:)

顺便说一下，您的代码可以重写为:

By the way, your code can be rewritten as:

public static double GetDouble(object input, double defaultVal)
{
    double parsed;
    return double.TryParse(input.ToString(), out parsed)) ? parsed : defaultVal;
}

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