C# 将绝对路径转换为相对路径

引言

 

在项目中常需要将绝对路径,转换为相对路径,来增加程序相关配置的的灵活性(不用因为整体挪个位置就导致我们的程序不能正常工作)

 

解决问题方法

 

自己写代码解决:

private string RelativePath(string absolutePath, string relativeTo)
{
string[] absoluteDirectories = absolutePath.Split('\\');
string[] relativeDirectories = relativeTo.Split('\\'); //Get the shortest of the two paths
int length = absoluteDirectories.Length < relativeDirectories.Length ? absoluteDirectories.Length : relativeDirectories.Length; //Use to determine where in the loop we exited
int lastCommonRoot = -1;
int index; //Find common root
for (index = 0; index < length; index++)
if (absoluteDirectories[index] == relativeDirectories[index])
lastCommonRoot = index;
else
break; //If we didn't find a common prefix then throw
if (lastCommonRoot == -1)
throw new ArgumentException("Paths do not have a common base"); //Build up the relative path
StringBuilder relativePath = new StringBuilder(); //Add on the ..
for (index = lastCommonRoot + 1; index < absoluteDirectories.Length; index++)
if (absoluteDirectories[index].Length > 0)
relativePath.Append("..\\"); //Add on the folders
for (index = lastCommonRoot + 1; index < relativeDirectories.Length - 1; index++)
relativePath.Append(relativeDirectories[index] + "\\");
relativePath.Append(relativeDirectories[relativeDirectories.Length - 1]); return relativePath.ToString();
}

 

通过C#中URI类来解决:

System.Uri uri1 = new Uri(@"C:\filename.txt");
System.Uri uri2 = new Uri(@"C:\mydirectory\anotherdirectory\"); Uri relativeUri = uri2.MakeRelativeUri(uri1); Console.WriteLine(relativeUri.ToString());

 

 

参考文献

 

http://msdn.microsoft.com/en-us/library/system.uri.makerelativeuri(v=vs.110).aspx

 

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