Cascade a url string

Question

Coming from this question, i'm looking for a way to cascade a url like Path.Combine for file system does including a path-parameter.

My input are the following 3 parameters:

string host = "test.com"; //also possilbe: "test.com/"
string path = "/foo/"; //also possilbe: "foo", "/", "","/foo","foo/"
string file = "test.temp"; //also possilbe: "/test.temp"

The expected result is

http://test.com/foo/test.temp

This approach is the best I could find but it does'n work for all cases:

Uri myUri = new Uri(new Uri("http://" + host +"/"+ path), file);

Why don't you trim host, path, file every time before you combine them. Then when you combine them use the forward slashes. — blogbydev, Sep 30 '15 at 09:09
then trim based on case if forward slash is present, add forward slash if not empty and create a final host, path, file. Then combine them like scheme+host+path. — blogbydev, Sep 30 '15 at 09:13
@RezaAghaei yes that's pretty good, i already upvoted Ales Potocnik Hahonina's answer before i asked this question but i'm looking more for a slim one liner — fubo, Sep 30 '15 at 12:14
@fubo I think the idea of using the extension method for this task is very friendly and I think it is one of the best answers of that tread that it worth to be mentioned here too:) — Reza Aghaei, Sep 30 '15 at 12:20
@RezaAghaei i'm a friend of extension methods too but when you have too much of them and use them only once in your whole code, i better try to solve the problem without a extension instead of havin a overcrowded code — fubo, Sep 30 '15 at 12:23

Tim Schmelter · Answer 1 · 2015-09-30T09:39:29.883

1

You can use the UriBuilder class + IO.Path.Combine for the Path:

var builder = new UriBuilder();
builder.Host = host.Trim('/');
builder.Path = Path.Combine(path.Trim('/'), file.Trim('/'));
string result = builder.ToString();  // "http://test.com/foo/test.temp"

If you want the Uri-inctance just use the Uri-property of the UriBuilder.

edited Sep 30 '15 at 09:39

answered Sep 30 '15 at 09:27

Tim Schmelter

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@fubo: then remove the redundant slashes. I've edited my answer and tested it with your samples. – Tim Schmelter Sep 30 '15 at 09:39
exactly that's the part of `Path.Combine` i don't understand. it should remove or add them automatically – fubo Sep 30 '15 at 09:42

Henk Mollema · Accepted Answer · 2015-09-30T12:07:03.313

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You could try using Uri.TryCreate():

Uri uri;
bool success = Uri.TryCreate(new Uri("http://" + host), path.Trim('/') + "/" + file.Trim('/'), out uri);

This will return false if the url is somehow in an incorrect format. However, if you are sure the format is correct, you can just use the Uri constructor:

var uri = new Uri(new Uri("http://" + host), path.Trim('/') + "/" + file.Trim('/'));

edited Sep 30 '15 at 12:07

answered Sep 30 '15 at 11:47

Henk Mollema

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score 0 · Answer 3 · answered Sep 30 '15 at 09:30

0

here you go

string url = string.Join("/", new[] { host, path, file }.Select(x => x.Trim('/'))
.Where(x => !String.IsNullOrEmpty(x)));

answered Sep 30 '15 at 09:30

Byyo

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While this code may answer the question, providing additional context regarding why and/or how this code answers the question improves its long-term value. – ryanyuyu Sep 30 '15 at 12:56

Cascade a url string

3 Answers3