如何将两个数字字符串相加? [英] How to add two strings that are numbers?

问题描述

我正在遍历一些节点并获取电荷并将它们加在一起.尽管收费是字符串类型.

i am looping through some nodes and getting the charge and adding them together. the charge is of type string though.

第一次循环字符串charge = "309",

first time it loops string charge = "309",

第二次循环字符串charge = "38";

second time it loop string charge = "38";

 `Looping through list of nodes
 {
   saBillDetail.TotalServiceUsage += totalSvcNode.InnerText;
 }
`

我原以为我可以将它们加在一起，但它们却像这样连接起来:

I would have expected that I could add them together, but they are being concatenated instead like this:

`charge + charge = '30938'`

如何强制将这些字符串视为数字?并在循环结束时得到这样的输出

How can I force these strings to be treated as numbers? and get output like this at the end of the loop

`charge + charge = '347'`

推荐答案

因为人们已经回答了这也许是另一种解决方案所以你不会出错

As people allready answered this maybe another solution So you don't get errors

    private static int AddTwoStrings(string one, string two) 
    {
        int iOne = 0;
        int iTwo = 0;
        Int32.TryParse(one, out iOne);
        Int32.TryParse(two, out iTwo);
        return iOne + iTwo;
    }

或者如果你想要一个字符串结果.

Or if you want a string result.

private static String AddTwoStrings(string one, string two) 
{
    int iOne = 0;
    int iTwo = 0;
    Int32.TryParse(one, out iOne);
    Int32.TryParse(two, out iTwo);
    return (iOne + iTwo).ToString();
}

正如 Alexei Levenkov 所说，您可以/应该处理异常.也许这样的事情会在开发过程中对您有所帮助

As Alexei Levenkov stated you could/should handle exceptions. Maybe something like this will help you during development

    private static int AddTwoStrings(string one, string two) 
    {
        int iOne = 0;
        int iTwo = 0;
        bool successParseOne = Int32.TryParse(one, out iOne);
        bool successParseTwo = Int32.TryParse(two, out iTwo);
        if (!successParseOne) 
        {
            throw new ArgumentException("one");
        }
        else if(!successParseTwo)
        {
            throw new ArgumentException("two");
        }

        return (iOne + iTwo);
    }

因此，当您输入错误号码时，您会在使用 try/catch 时收到通知

So when you have a wrong number you will be notified if you use try/catch

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