获取两个字符串的通用前缀 [英] get common prefix of two string

问题描述

我正在尝试在C#中比较两个字符串，但是我无法找到一种无需自己构建东西即可获得所需结果的方法.

I am trying to compare two string in C# but I cant find a way to get the result I need without building something myself.

字符串:

TestasdOne
TestasdTwo

TestasdOne
TestasdTwo

结果:

Testasd

Testasd

我尝试了linq，但无法正常工作. 我尝试过Google.

I tried linq but could not get it to work. I tried Google.

提前谢谢.

推荐答案

以下是非linq版本，它更加有效，清晰和可读

Here is the non-linq version which is more efficient, clear and readable

public static string CommonPrefix(string a, string b)
{
    if (a == null)
        throw new ArgumentNullException(nameof(a));

    if (b == null)
        throw new ArgumentNullException(nameof(b));

    var min = Math.Min(a.Length, b.Length);
    var sb = new StringBuilder(min);
    for (int i = 0; i < min && a[i] == b[i]; i++)
        sb.Append(a[i]);

    return sb.ToString();
}

喜欢使用

Console.WriteLine(CommonPrefix("TestasdOne", "TestasdTwo")); //Testasd

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