Concatenate URL with variable in C#

Question

I am trying to concatenate a URL with a variable and then the "rest" of the URL.

It goes like this:

variableName = "1234";

....

var requestMessage = new HttpRequestMessage(HttpMethod.Get, _configuration["MY_BASE_URL" + variableName + "/theRestOfTheUrl"]);

Where the "MY_BASE_URL" is saved as an variable as: "http://mytestsite.com/users/"

but when doing this I get the error:

"error":"An invalid request URI was provided. The request URI must either be an absolute URI or BaseAddress must be set.

What am I doing wrong? When just passing:

var requestMessage = new HttpRequestMessage(HttpMethod.Get, _configuration["MY_BASE_URL"]);

where I instead have named "MY_BASE_URL" as "http://mytestsite.com/users/1234/theRestOfTheUrl" I get no errors, but I would to be able to add the variableName too + what comes after, with the option of having the variableName being dynamic - and therefore I can't give it as an entire hardcoded string.

Create a variable and try to create MY_BASE_URL" + variableName + "/theRestOfTheUrl out of _configuration. — Hamed Moghadasi
– Hamed Moghadasi, Commented Jan 28, 2020 at 12:17

Prasad Telkikar · Accepted Answer · 2020-01-28 12:23:24Z

3

_configuration["MY_BASE_URL"] is a configuration variable which returns your base URL i.e http://mytestsite.com/users/, now you need to append variable value to it then hard coded string /theRestOfTheUrl.

Instead of writing everything inside _configuration key, write it with string interpolation

Try

string url = $"{_configuration["MY_BASE_URL"]}{variableName}/theRestOfTheUrl";
Console.WriteLine(url); // http://mytestsite.com/users/1234/theRestOfTheUrl

Your code will look like

variableName = "1234";

....

string url = $"{_configuration["MY_BASE_URL"]}{variableName}/theRestOfTheUrl";
var requestMessage = new HttpRequestMessage(HttpMethod.Get, url);

POC: .net Fiddle

edited Jan 28, 2020 at 12:23

answered Jan 28, 2020 at 12:11

Prasad Telkikar

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Comments

Mohammed ElGayyar · Accepted Answer · 2023-09-03 22:26:35Z

0

I think you just missed a square bracket _configuration["MY_BASE_URL"]

variableName = "1234";

....

var requestMessage = new HttpRequestMessage(HttpMethod.Get, _configuration["MY_BASE_URL"] + variableName + "/theRestOfTheUrl");

answered Sep 3, 2023 at 22:26

Mohammed ElGayyar

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