c# - 找出多少个字符串匹配

说我有两个字符串：

"SomeTextHereThatIsTheSource"
"SomeTextHereThatIsCloseToTheSourceButNotTheSame"

是否有一种巧妙的.net方式可以知道文本的哪一部分是相同的（从头开始）。

因此，在此示例中，结果将是：

"SomeTextHereThatIs"

最佳答案

您可以使用TakeWhile：

string MatchFromStart(string s1, string s2)
{
    if (s1 == null || s2 == null) return "";

    var matchingArray = s1.TakeWhile((c, i) => { return i < s2.Length && c == s2[i]; });
    return String.Join("", matchingArray);
}

然后使用它：

string s1 = "SomeTextHereThatIsTheSource";
string s2 = "SomeTextHereThat";
string s3 = "SomeTextHereThatIsCloseToTheSourceButNotTheSame";
Console.WriteLine(MatchFromStart(s1, s2));   // SomeTextHereThat
Console.WriteLine(MatchFromStart(s2, s1));   // SomeTextHereThat
Console.WriteLine(MatchFromStart(s3, s1));   // SomeTextHereThatIs
Console.WriteLine(MatchFromStart("", s1));   // (blank string)
Console.WriteLine(MatchFromStart(s3, ""));   // (blank string)
Console.WriteLine(MatchFromStart(null, s1)); // (blank string)
Console.WriteLine(MatchFromStart(s2, null)); // (blank string)

关于c# - 找出多少个字符串匹配，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14417962/