Requests

RRBMKBlaze

11/17/2023

Hello, i have never done something that i will say before, how can i send a request to an API Url, get responce in a form of a .json file and then getting specific values from the .json into variables. How can i do that?

AAngius

11/17/2023

HttpClient Then .GetFromJsonAsync<T>() Where T is a class that represents the JSON response

PPixxelKick

11/17/2023

Is the API returning a json file or a json response? Json File you'll need to handle slightly different as it's a text file which has a small bit of headers and you need to open a stream reader, I think? I want to say a text file cant be read exactly the same way as a raw byte stream of text, the file has a little bit of stuff at the start to go "Im a file!"

RRBMKBlaze

11/17/2023

json responce

PPixxelKick

11/17/2023

oh then thats easy yeh, what Z23Z said is 👍

RRBMKBlaze

11/17/2023

how could i pass data into httpclient

AAngius

11/17/2023

What data?

PPixxelKick

11/17/2023

https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclient?view=net-8.0&viewFallbackFrom=dotnet-aspire-8.0

AAngius

11/17/2023

A GET request has no body, only query parameters

RRBMKBlaze

11/17/2023

for exaplme the api im using requires username + password to be passed in order to get a valid login token

AAngius

11/17/2023

Ah, a POST request then .PostAsJsonAsync<T>(url, data)

PPixxelKick

11/17/2023

is it FormContent or Body or Url Params?

RRBMKBlaze

11/17/2023

"Content-Type: application/json" body

PPixxelKick

11/17/2023

Body, aight

RRBMKBlaze

11/17/2023

var client = new HttpClient();

var pairs = new List<KeyValuePair<string, string>> {                 
    new KeyValuePair<string, string>("username", "username"),
    new KeyValuePair<string, string>("password", "password")
};
var content = new FormUrlEncodedContent(pairs);

var response = client.PostAsync(URL_LOGIN, content).Result;

if (response.IsSuccessStatusCode) {
    string _data = await response.Content.ReadAsStringAsync();
}

var client = new HttpClient();

var pairs = new List<KeyValuePair<string, string>> {                 
    new KeyValuePair<string, string>("username", "username"),
    new KeyValuePair<string, string>("password", "password")
};
var content = new FormUrlEncodedContent(pairs);

var response = client.PostAsync(URL_LOGIN, content).Result;

if (response.IsSuccessStatusCode) {
    string _data = await response.Content.ReadAsStringAsync();
}

So something like this?

PPixxelKick

11/17/2023

FormUrlEncodedContent is for when it has to be submitted as FormContent PostAsJsonAsync is when it has to be submitted as just application/json in the body

RRBMKBlaze

11/17/2023

httpclient.PostAsJsonAsync? ah just needed to add a reference to http.formating altho im confused on what type the "value" has to be

AAngius

11/17/2023

class PostData
{
    [JsonProperty("username")]
    public string Username { get; init; }
    [JsonProperty("password")]
    public string Password { get; init; }
}

class PostData
{
    [JsonProperty("username")]
    public string Username { get; init; }
    [JsonProperty("password")]
    public string Password { get; init; }
}

var client = new HttpClient();

var data = new PostData {
    Username = ...,
    Password = ...,
}
var response = await client.PostAsJsonAsync(url, data);
var responseData = response.ReadFromJsonAsync<SomeClass>();

var client = new HttpClient();

var data = new PostData {
    Username = ...,
    Password = ...,
}
var response = await client.PostAsJsonAsync(url, data);
var responseData = response.ReadFromJsonAsync<SomeClass>();

SomeClass being a class that describes the data you get from the endpoint

RRBMKBlaze

11/17/2023

okay thanks also if you dont mind how can i enable cs9+ , i cant find <LangVersion> inside my .csproj

AAngius

11/17/2023

What's the framework version you're using?

RRBMKBlaze

11/17/2023

i find that in .csproj?

AAngius

11/17/2023

Yep

RRBMKBlaze

11/17/2023

4.8

AAngius

11/17/2023

Oof Why not use a recent version of .NET instead?

RRBMKBlaze

11/17/2023

idk xD i never got to update it +idk how to do it

AAngius

11/17/2023

You probably created a project with .NET Framework instead of .NET For reference, $newproject

MMODiX

11/17/2023

When creating a new project, prefer using .NET over .NET Framework, unless you have a very specific reason to be using .NET Framework. .NET Framework is now legacy code and only get security fix updates, it no longer gets new features and is not recommended. https://cdn.discordapp.com/attachments/569261465463160900/899381236617855016/unknown.png

RRBMKBlaze

11/17/2023

never touched those things

AAngius

11/17/2023

Did you not create this project, then?

RRBMKBlaze

11/17/2023

aight lemme remake my project i did but i used .net framework

AAngius

11/17/2023

Well, shouldn't have

RRBMKBlaze

11/17/2023

dw i didnt go much into it aigh so i got 7.0 rn

AAngius

11/17/2023

8.0 is current Might have to update VS to use it, tho

RRBMKBlaze

11/17/2023

hm gimme a sec i updated it, we will talk tmr if thats fine i have to do smt rn

PPixxelKick

11/17/2023

I wish "paste json as class" automated this, hopefully eventually this becomes a thing

RRBMKBlaze

11/17/2023

@ZZZZZZZZZZZZZZZZZZZZZZZZZ ive got the framework on my project how do i enable cs 9 now?

AAngius

11/17/2023

If you have a .NET 8 project, you should be on C# 12 from the get-go

RRBMKBlaze

11/17/2023

ah okay tyty

RRBMKBlaze

11/17/2023

ive never met this error before:

RRBMKBlaze

11/17/2023

i mean i did but i do not understand it

AAngius

11/17/2023

You need the extension method from... uh, whatever namespace See if quick fixes fix it

RRBMKBlaze

11/17/2023

ah okay

AAngius

11/17/2023

System.Net.Http.Json is where thos extension methods are

RRBMKBlaze

11/17/2023

now it doesnt show up in COM oh okay there was http.extentions one installed it and included it still doesnt fix it

AAngius

11/17/2023

Wym "installed"? It's not a nuget, no need to install anything

RRBMKBlaze

11/17/2023

it is its not in the COM list for me

RRBMKBlaze

11/17/2023

installing this fixed it

AAngius

11/17/2023

Huh, maybe it is, then

RRBMKBlaze

11/26/2023

before i installed the latest vs i didnt have to install it, cus i installed a package requireing it before which prob installed it @ZZZZZZZZZZZZZZZZZZZZZZZZZ sorry for the ping, i stopped working on this for some time as of irl stuff, how do i get the data from the class inputed into ReadFromJsonAsync<>();?

AAngius

11/26/2023

The example you mentioned is how There isn't anything more to it

RRBMKBlaze

11/26/2023

im confused lmfao what example did i mention

AAngius

11/26/2023

My message you replied to

RRBMKBlaze

11/26/2023

i got my "responeData" i got that but how do i get the value that has been returned from the response

AAngius

11/26/2023

From responseData

RRBMKBlaze

11/26/2023

like my class has a int Token, how do i get that Token from responseData

AAngius

11/26/2023

The SomeClass class should describe the data you expect to receive

RRBMKBlaze

11/26/2023

yeah ive got that

AAngius

11/26/2023

So if you expect to receive

{
    "status": "running",
    "count": 67162,
    "identifier": "781b-1-3bb2-1"
}

{
    "status": "running",
    "count": 67162,
    "identifier": "781b-1-3bb2-1"
}

you will have a class

class MyCoolData
{
    [JsonProperty("status")]
    public string Status { get; init; }
    [JsonProperty("count")]
    public int Count { get; init; }
    [JsonProperty("identifier")]
    public string Identifier { get; init; }
}

class MyCoolData
{
    [JsonProperty("status")]
    public string Status { get; init; }
    [JsonProperty("count")]
    public int Count { get; init; }
    [JsonProperty("identifier")]
    public string Identifier { get; init; }
}

and after getting the data from the stream

var responseData = await response.ReadFromJsonAsync<MyCoolData>();

var responseData = await response.ReadFromJsonAsync<MyCoolData>();

you can get the status with

var s = responseData.Status;

var s = responseData.Status;

RRBMKBlaze

11/26/2023

yea but how do i get the value of "Count" for example from responseData

AAngius

11/26/2023

responseData.Count

RRBMKBlaze

11/26/2023

i did that with my "Token" variable but it wasnt under responsedata

AAngius

11/26/2023

MyCoolData responseData = await response.ReadFromJsonAsync<MyCoolData>();

MyCoolData responseData = await response.ReadFromJsonAsync<MyCoolData>();

this might be easier to understand

RRBMKBlaze

11/26/2023

tyty, im getting status 443 from the api url, it means that the url endpoint doesnt exist?

AAngius

11/26/2023

I don't remember every status code by heart Look up what it means on MDN

RRBMKBlaze

11/26/2023

RRBMKBlaze

11/26/2023

AAngius

11/26/2023

Notice your lack of await

RRBMKBlaze

11/26/2023

im blind sorry fr this time late night coding 10/10 would not recommend im confused, out of nowhere it throws an "System.Text.Json.JsonException: ''I' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0.'" from System.Text.Json.JsonException, i didnt touch that part of my code, google search did not help

AAngius

11/26/2023

What's the actual response you get from the API? Run it via some REST client like Bruno or Nightingale Or even just open it in the browser Chances are, that for some reason what you get from that URL isn't valid JSON

RRBMKBlaze

11/26/2023

how can i pass the json parms trought tho

AAngius

11/26/2023

Right, that's why I mentioned using some client You can pass params there at will Alternatively, read the response as a string and log it to the console

RRBMKBlaze

11/26/2023

ill extract the response into a plain text file

AAngius

11/26/2023

That'll do in a pinch as well Yeah

RRBMKBlaze

11/26/2023

i get returned "Internal Server Error" as plain string text, an issue of the api was already created on github but closed ill make anothjer one

AAngius

11/26/2023

Ah, that'll do it, yeah Might want to check the response status first, before trying to deserialize it

RRBMKBlaze

11/26/2023

i think its 505

AAngius

11/26/2023

That way you can actually tell that an error has occured instead of crashing the app

RRBMKBlaze

11/26/2023

nvm i have trycatch dw Yeah ill try tmr some poeple were saying they get same issue around same time.

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