How can I robustly combine URIs in C# to handle leading/trailing slashes? [duplicate]

Question

I'm working on a C# project where I need to combine a base URL with various endpoints. However, I'm running into issues when the endpoint has a leading slash. For example:

string baseUrl = "https://example.com/api/v1/"; string endpoint = "/sessions/logon/"; Uri baseUri = new Uri(baseUrl); Uri fullUri = new Uri(baseUri, endpoint); Console.WriteLine(fullUri);

This code results in https://example.com/sessions/logon instead of the expected https://example.com/api/v1/sessions/logon. The leading slash in the endpoint causes it to override the base URL path.

Is there a robust way to combine URIs that correctly handles leading/trailing slashes?

Is there a robust way to combine URIs that correctly handles leading/trailing slashes? yes - use a library that does all that plus handles all the edge cases you haven’t thought of - eg flurl.dev — stuartd
– stuartd, Commented Jun 20, 2024 at 11:45

Alex Hovy · Accepted Answer · 2024-06-20 11:23:32Z

I came up with a solution that involves creating an extension method to handle this scenario. Here’s the extension method I developed:

public static class UriExtension { public static Uri Combine(this Uri baseUri, params string[] endpoints) { // Convert baseUri to string, trim it, and ensure it ends with a slash string baseUrl = baseUri.ToString().TrimEnd('/') + "/"; // Trim each endpoint and join them with slashes string combinedPath = string.Join("/", endpoints.Select(e => e.Trim('/'))); Uri fullUri = new Uri(new Uri(baseUrl), combinedPath); return fullUri; } }

Usage

Here's how I use this extension method in my code. I've split the endpoint into parts just to illustrate the issue with the slashes:

Uri baseUri = new Uri("https://example.com/api/v1/"); string[] endpoints = { "/sessions/", "/logon/" }; Uri fullUri = baseUri.Combine(endpoints); Console.WriteLine(fullUri);

This method ensures that no matter if the URIs have slashes at the beginning or end, they will be correctly combined into https://example.com/api/v1/sessions/logon/.

This solution has worked well for me, handling all variations of leading and trailing slashes gracefully.

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