如何检查一条路径是否是另一条路径的子路径? [英] How to check if one path is a child of another path?

问题描述

如何检查一条路径是否是另一条路径的子路径?
仅仅检查子字符串不是一种方法，因为可以有诸如 .和..等

How to check if one path is a child of another path?
Just checking for substring is not a way to go, because there can items such as . and .., etc

推荐答案

遗憾的是它不像 StartsWith 那样简单.

Unfortunately it's not as simple as StartsWith.

这是一个更好的答案，改编自 这个 重复的问题.为了便于使用，我已将其作为扩展方法.同样使用暴力catch，因为几乎任何访问文件系统的方法都可能因用户权限而失败.

Here's a better answer, adapted from this duplicate question. I've made it an extension method for ease of use. Also using a brute-force catch as just about any method that accesses the file system can fail based on user permissions.

public static bool IsSubDirectoryOf(this string candidate, string other)
{
    var isChild = false;
    try
    {
        var candidateInfo = new DirectoryInfo(candidate);
        var otherInfo = new DirectoryInfo(other);

        while (candidateInfo.Parent != null)
        {
            if (candidateInfo.Parent.FullName == otherInfo.FullName)
            {
                isChild = true;
                break;
            }
            else candidateInfo = candidateInfo.Parent;
        }
    }
    catch (Exception error)
    {
        var message = String.Format("Unable to check directories {0} and {1}: {2}", candidate, other, error);
        Trace.WriteLine(message);
    }

    return isChild;
}

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