C＃有内置的解析页面数字符串支持？ [英] Does C# have built-in support for parsing page-number strings?

问题描述

C＃有内置支持用于解析页码的字符串？由页码，我的意思是你可能会进入一个打印对话框，这是逗号和破折号分隔的混合物格式

Does C# have built-in support for parsing strings of page numbers? By page numbers, I mean the format you might enter into a print dialog that's a mixture of comma and dash-delimited.

事情是这样的：

1,3,5-10,12

什么是非常好的是，给我回一些用字符串表示所有页码列表的解决方案。在上面的例子中，得到一个列表像这样就好了：

What would be really nice is a solution that gave me back some kind of list of all page numbers represented by the string. In the above example, getting a list back like this would be nice:

1,3,5,6,7,8,9,10,12

我只是想避免滚动我自己，如果有一个简单的方法做。它

I just want to avoid rolling my own if there's an easy way to do it.

推荐答案

应该是简单的：

foreach( string s in "1,3,5-10,12".Split(',') ) 
{
    // try and get the number
    int num;
    if( int.TryParse( s, out num ) )
    {
        yield return num;
        continue; // skip the rest
    }

    // otherwise we might have a range
    // split on the range delimiter
    string[] subs = s.Split('-');
    int start, end;

    // now see if we can parse a start and end
    if( subs.Length > 1 &&
        int.TryParse(subs[0], out start) &&
        int.TryParse(subs[1], out end) &&
        end >= start )
    {
        // create a range between the two values
        int rangeLength = end - start + 1;
        foreach(int i in Enumerable.Range(start, rangeLength))
        {
            yield return i;
        }
    }
}

修改感谢修复;-)

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