c# - 获取2个字符串之间的差异

Question

我正在尝试计算两个字符串之间的差异

例如

string val1 = "Have a good day";
string val2 = "Have a very good day, Joe";

结果将是一个字符串列表，其中包含 2 个项目“very”和“, Joe”

到目前为止，我对这个任务的研究还没有太多结果

编辑:结果可能需要 2 个单独的字符串列表，一个包含添加，一个包含删除

Answer 1

这是我能想到的最简单的版本:

class Program
{
    static void Main(string[] args)
    {
        string val1 = "Have a good day";
        string val2 = "Have a very good day, Joe";

        MatchCollection words1 = Regex.Matches(val1, @"\b(\w+)\b");
        MatchCollection words2 = Regex.Matches(val2, @"\b(\w+)\b");

        var hs1 = new HashSet<string>(words1.Cast<Match>().Select(m => m.Value));
        var hs2 = new HashSet<string>(words2.Cast<Match>().Select(m => m.Value));

        // Optionaly you can use a custom comparer for the words.
        // var hs2 = new HashSet<string>(words2.Cast<Match>().Select(m => m.Value), new MyComparer());

        // h2 contains after this operation only 'very' and 'Joe'
        hs2.ExceptWith(hs1); 

    }
}

custom comparer :

public class MyComparer : IEqualityComparer<string>
{
    public bool Equals(string one, string two)
    {
        return one.Equals(two, StringComparison.OrdinalIgnoreCase);
    }

    public int GetHashCode(string item)
    {
        return item.GetHashCode();
    }
}