我正在编写一个控制台实用程序来对命令行上指定的文件进行一些处理,但我遇到了一个无法通过Google/Stack和Overflow解决的问题。如果指定了完整路径(包括驱动器号),如何将该路径重新格式化为相对于当前工作目录?
一定有类似于VirtualPathUtility.MakeRelative函数的东西,但如果有,我也不知道。
发布于 2009-03-31 22:15:10
如果您不介意斜杠被交换,您可以滥用Uri
Uri file = new Uri(@"c:\foo\bar\blop\blap.txt");
// Must end in a slash to indicate folder
Uri folder = new Uri(@"c:\foo\bar\");
string relativePath =
Uri.UnescapeDataString(
folder.MakeRelativeUri(file)
.ToString()
.Replace('/', Path.DirectorySeparatorChar)
);
作为函数/方法:
string GetRelativePath(string filespec, string folder)
{
Uri pathUri = new Uri(filespec);
// Folders must end in a slash
if (!folder.EndsWith(Path.DirectorySeparatorChar.ToString()))
{
folder += Path.DirectorySeparatorChar;
}
Uri folderUri = new Uri(folder);
return Uri.UnescapeDataString(folderUri.MakeRelativeUri(pathUri).ToString().Replace('/', Path.DirectorySeparatorChar));
}
发布于 2009-03-31 22:14:05
您可以使用Environment.CurrentDirectory
获取当前目录,使用FileSystemInfo.FullPath
获取任何位置的完整路径。因此,完全限定当前目录和相关文件,然后检查完整文件名是否以目录名开头-如果是,只需根据目录名的长度获取适当的子字符串。
下面是一些示例代码:
using System;
using System.IO;
class Program
{
public static void Main(string[] args)
{
string currentDir = Environment.CurrentDirectory;
DirectoryInfo directory = new DirectoryInfo(currentDir);
FileInfo file = new FileInfo(args[0]);
string fullDirectory = directory.FullName;
string fullFile = file.FullName;
if (!fullFile.StartsWith(fullDirectory))
{
Console.WriteLine("Unable to make relative path");
}
else
{
// The +1 is to avoid the directory separator
Console.WriteLine("Relative path: {0}",
fullFile.Substring(fullDirectory.Length+1));
}
}
}
我并不是说它是世界上最健壮的东西(符号链接可能会把它搞糊涂),但如果这只是一个你偶尔会用到的工具,那也没问题。
发布于 2013-10-18 23:37:19
public string MakeRelativePath(string workingDirectory, string fullPath)
{
string result = string.Empty;
int offset;
// this is the easy case. The file is inside of the working directory.
if( fullPath.StartsWith(workingDirectory) )
{
return fullPath.Substring(workingDirectory.Length + 1);
}
// the hard case has to back out of the working directory
string[] baseDirs = workingDirectory.Split(new char[] { ':', '\\', '/' });
string[] fileDirs = fullPath.Split(new char[] { ':', '\\', '/' });
// if we failed to split (empty strings?) or the drive letter does not match
if( baseDirs.Length <= 0 || fileDirs.Length <= 0 || baseDirs[0] != fileDirs[0] )
{
// can't create a relative path between separate harddrives/partitions.
return fullPath;
}
// skip all leading directories that match
for (offset = 1; offset < baseDirs.Length; offset++)
{
if (baseDirs[offset] != fileDirs[offset])
break;
}
// back out of the working directory
for (int i = 0; i < (baseDirs.Length - offset); i++)
{
result += "..\\";
}
// step into the file path
for (int i = offset; i < fileDirs.Length-1; i++)
{
result += fileDirs[i] + "\\";
}
// append the file
result += fileDirs[fileDirs.Length - 1];
return result;
}
这段代码可能不是万无一失的,但这就是我想出来的。它更健壮一点。它采用两条路径并返回路径B作为相对于路径A的路径。
示例:
MakeRelativePath("c:\\dev\\foo\\bar", "c:\\dev\\junk\\readme.txt")
//returns: "..\\..\\junk\\readme.txt"
MakeRelativePath("c:\\dev\\foo\\bar", "c:\\dev\\foo\\bar\\docs\\readme.txt")
//returns: "docs\\readme.txt"
https://stackoverflow.com/questions/703281
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