Asp. NET Tutorial: A method of flattening absolute and relative paths

Introduction

When doing file path processing, often need to operate on the relative path of a path, then how to flatten the relative path to generate a new absolute path?

Path.Combine () method

We know that System.IO.Path is a static class designed to handle paths, and it has a combine () method that is used to splice paths, and we test the stitching effect.

We used a command-line program to test a series of relative paths relative to the file c:abc123avatar.html, and the test code was as follows:

Class Program

{

static string path = @ "c:abc123avatar.html";

static void Main (string[] args)

{

Console.WriteLine (path);

Console.WriteLine ("Enter a relative path to complete the merge:");

Console.WriteLine ();

while (true)

{

Console.WriteLine ("Merge as:" + Merge Path (Console.ReadLine ()));

Console.WriteLine ();

}

}

private static string merge path (string p)

{

Return Path.Combine (Path.getdirectoryname (Path), p);

}

}

The "Merge Path" method has the ability to first get the directory where the file is located, and then flatten it with the relative path.

Test results:

As you can see, the general path flattening is fine, but enter "..." is not handled properly as a superior directory, but directly to the merge, which is not what I expected to see.

What to do to support "..." What is the relative path of the form?

Using the constructor of a URI object

I found that the URI object can be constructed with a URI and a relative path to be constructed as a new URI, and we can represent the local file path in the form of "file://...", let's change the code to do a split test on the relative URI.

Changed code:

Class Program

{

static string path = @ "c:abc123avatar.html";

static string path = @ "file:///C:/abc/123/avatar.html";

static void Main (string[] args)

{

Console.WriteLine (path);

Console.WriteLine ("Enter a relative path to complete the merge:");

Console.WriteLine ();

while (true)

{

Console.WriteLine ("Merge as:" + Merge Path (Console.ReadLine ()));

Console.WriteLine ("Merge as:" + merge Uri (Console.ReadLine ()));

Console.WriteLine ();

}

}

private static string merge path (string p)

{

Return Path.Combine (Path.getdirectoryname (Path), p);

}

Private static string merge Uri (string p)

{

return new Uri (new Uri (path), p). Absoluteuri;

}

}

Test results:

Great, perfect support ". /"form of the relative path!"

Perfect

The next step is to convert the path to a URI, then flatten the relative path, and then convert back to the path form.

The conversion is only a method of string processing, the modified code is as follows:

Class Program

{

static string path = @ "c:abc123avatar.html";

static void Main (string[] args)

{

Console.WriteLine (path);

Console.WriteLine ("Enter a relative path to complete the merge:");

Console.WriteLine ();

while (true)

{

Console.WriteLine ("Merge as:" + Merge Path (Console.ReadLine ()));

Console.WriteLine ();

}

}

private static string merge path (string p)

{

return new Uri (new Uri ("file:///" + path). Replace ("\", "/")), P.replace ("\", "/")). Absoluteuri.substring (8). Replace ("/", "\");

}

}

Test results:

Conclusion

The result is very satisfactory, but I always think this is a earthwork, the cottage method, who has a more convenient, orthodox point of approach?

Thank you for coming up with the orthodox wording so soon: Path.GetFullPath (Path.combin (@ "C:ac", "... text"));

I have been looking for so long, and toss so long, just to make a cottage to come, really ashamed ah, hehe.