转换为整数int数组的逗号分隔字符串 [英] Convert comma separated string of ints to int array

问题描述

我只找到一个办法做到这一点相反的方式轮：创造，而不是对如何输入转换如字符串str =1,2从一个int列表或数组分隔的字符串逗号， 3,4,5; 来int数组或列表

I only found a way to do it the opposite way round: create a comma separated string from an int list or array, but not on how to convert input like string str = "1,2,3,4,5"; to an array or list of ints.

下面是我实现的（由<一个启发href=\"http://stackoverflow.com/questions/1018407/what-is-the-most-elegant-way-to-get-a-set-of-items-by-index-from-a-collection/1018624#1018624\">this通过埃里克利珀后）：

Here is my implementation (inspired by this post by Eric Lippert):

    public static IEnumerable<int> StringToIntList(string str)
    {
        if (String.IsNullOrEmpty(str))
        {
            yield break;
        }

        var chunks = str.Split(',').AsEnumerable();

        using (var rator = chunks.GetEnumerator())
        {
            while (rator.MoveNext())
            {
                int i = 0;

                if (Int32.TryParse(rator.Current, out i))
                {
                    yield return i;
                }
                else
                {
                    continue;
                }
            }
        }
    }

你觉得这是一个很好的做法还是有一个更容易，甚至内置的方式？

Do you think this is a good approach or is there a more easy, maybe even built in way?

编辑：对不起任何混乱，但该方法需要处理像1,2 ,,, 3或无效的输入###，5，等，通过跳过它。

Sorry for any confusion, but the method needs to handle invalid input like "1,2,,,3" or "###, 5," etc. by skipping it.

推荐答案

您应该使用foreach循环，像这样的：

You should use a foreach loop, like this:

public static IEnumerable<int> StringToIntList(string str) {
    if (String.IsNullOrEmpty(str))
        yield break;

    foreach(var s in str.Split(',')) {
        int num;
        if (int.TryParse(s, out num))
            yield return num;
    }
}

请注意，喜欢你原来的职位，这将忽略不能解析的数字。

Note that like your original post, this will ignore numbers that couldn't be parsed.

如果你想抛出一个异常，如果一些无法解析，可以更简单地使用LINQ做到这一点：

If you want to throw an exception if a number couldn't be parsed, you can do it much more simply using LINQ:

return (str ?? "").Split(',').Select<string, int>(int.Parse);

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