我怎样才能在两个字符串之间找到交叉点的主要元素呢？

Question

I am working on a project that requires some string manipulation and i need some help.

Say i have two strings:

string1 = "1 2 3 4 5";
string2 = "1 2 4 6 7";

This is actually what most of the strings I will be working with look like.

I would like to know what is a smart, modern method, if any, to find the number of intersection between string of this type, something idealy like this:

//a way to create GetCardinal is what I am looking for     
int cardinal = GetCardinal(string1, string2);
//Cardinal should be 3 as the intersection is "1 2 4"

I am mainly interested in methods that work great for the type of inputs like string1 and string2, meaning sequences of numbers separated by blank spaces

The reason for not using a List of int's is because the strings are output values and I am expecting some character outputs as well.

Thank you, Ciprian

Answer 1

String.Split , String.Join and a little bit of LINQ ( Intersect ) will do the job:

var result = String.Join(" ", string1.Split(' ').Intersect(string2.Split(' ')));

If you just need number of elements in the intersection, use Count :

var cardinal = string1.Split(' ').Intersect(string2.Split(' ')).Count();

Answer 2

你必须用空格分割它们，然后你可以使用Intersect + Count ：

int cardinal = string1.Split().Intersect(string2.Split()).Count();

Answer 3

You can use the split function of string plus some Linq

    int GetCardinal(string s1, string s2)
    {
        return s1.Split(' ').Intersect(s2.Split(' ')).Count();
    }

or if you could have multiple spaces or tabs:

    int GetCardinal(string s1, string s2)
    {
        char []separators = new char[] { ' ', '\t' };
        return s1.Split(separators, StringSplitOptions.RemoveEmptyEntries).Intersect(s2.Split(separators, StringSplitOptions.RemoveEmptyEntries)).Count();
    }