C#•3y ago

I can't JSON to List ;_; [Answered]

The JSON value could not be converted to System.Collections.Generic.List`1[Card]. Path: $ | LineNumber: 0 | BytePositionInLine: 1.'

The JSON value could not be converted to System.Collections.Generic.List`1[Card]. Path: $ | LineNumber: 0 | BytePositionInLine: 1.'

That's my error Here's my attempt to just call and dump it into a List.

        private static async Task ProcessRepositories()
        {
            var stringTask = client.GetStringAsync("https://api.magicthegathering.io/v1/cards/");
            var msg = await stringTask;
            var cards = JsonSerializer.Deserialize<List<Card>>(msg);
        }

        private static async Task ProcessRepositories()
        {
            var stringTask = client.GetStringAsync("https://api.magicthegathering.io/v1/cards/");
            var msg = await stringTask;
            var cards = JsonSerializer.Deserialize<List<Card>>(msg);
        }

100 Replies

BigggMoustacheOP•3y ago

I looked at the JSON returned and it starts like this {"cards":[{"name":"Ancestor's** so I see where my issue is, but I don't know how to address it. a <List<Card> is not the same as a {"cards": arrayOfCards so I understand I should make a class for the "cards" in the json, with my existing Cards class inside of it. I'm going to try that.

mtreit•3y ago

Did you create the json by hand?

BigggMoustacheOP•3y ago

No it's return from the URL above https://api.magicthegathering.io/v1/cards/ This returns 100 cards as default and the opening {"cards":[{"name":"Ancestor's here indicates there is an object above the actual card when returning multiple correct? I don't know what it looks like when returning 1 card alone that was meant to be a question. sorry

mtreit•3y ago

Are you using Visual Studio?

BigggMoustacheOP•3y ago

yepper

mtreit•3y ago

This might help you:

BigggMoustacheOP•3y ago

what do i click on?

mtreit•3y ago

That's on the Edit menu

BigggMoustacheOP•3y ago

lol I'm misunderstanding.

mtreit•3y ago

BigggMoustacheOP•3y ago

yeah I just gotta copy the return first. still get the error using autogenerated content sec

mtreit•3y ago

Did you try deserializing to RootObject?

BigggMoustacheOP•3y ago

System.Text.Json.JsonException: 'The JSON value could not be converted to System.Collections.Generic.List`1[Rootobject]. Path: $ | LineNumber: 0 | BytePositionInLine: 1.'

System.Text.Json.JsonException: 'The JSON value could not be converted to System.Collections.Generic.List`1[Rootobject]. Path: $ | LineNumber: 0 | BytePositionInLine: 1.'

mtreit•3y ago

No, just RootObject Not List

BigggMoustacheOP•3y ago

oh lmao okay okay that worked. I understand a bit now. I wasn't adding Card as array in my previous class second question, if it returns one object, this form is still generally valid, or is it implementation dependent

mtreit•3y ago

Not sure what you mean

BigggMoustacheOP•3y ago

the fact that the return structure is a list of cards in this case

mtreit•3y ago

Totally depends on what was serialized

BigggMoustacheOP•3y ago

if it's one card returned it'd probably still be {"cards": oneCardInArray oh alright

mtreit•3y ago

BTW you can change Card[] to List<Card> and it should still work just fine.

BigggMoustacheOP•3y ago

yeah thanks for that too so when the json has an array built in I can't use the Deserialize<List<Object> that is what was tripping me up because EVERY tutorial on it I found was using that the deserialize multiple objects returned b ythe json

mtreit•3y ago

I don't actually work with JSON that much but I don't think you can choose to deserialize a subset of the data. I think other formats like protobuf actually support that but I'm not aware that JSON does.

BigggMoustacheOP•3y ago

well not to to a portion, just the way you tell it it's a list or array but either way I understand a bit more, and thank you very much for that.

Accord•3y ago

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mtreit•3y ago

You can serialize a List<Card> yourself to see what that looks like in JSON. The root element is a JSON array in that case. It looks like this (I removed all properties except Name for brevity)

[{"Name":"Card 0"},{"Name":"Card 1"},{"Name":"Card 2"},{"Name":"Card 3"},{"Name":"Card 4"},{"Name":"Card 5"},{"Name":"Card 6"},{"Name":"Card 7"},{"Name":"Card 8"},{"Name":"Card 9"}]

[{"Name":"Card 0"},{"Name":"Card 1"},{"Name":"Card 2"},{"Name":"Card 3"},{"Name":"Card 4"},{"Name":"Card 5"},{"Name":"Card 6"},{"Name":"Card 7"},{"Name":"Card 8"},{"Name":"Card 9"}]

BigggMoustacheOP•3y ago

Yeah I get that bud

mtreit•3y ago

Now you could take that and deserialize that to a List<Card>. But that's not the format that the web site is giving you.

BigggMoustacheOP•3y ago

so what's the point of deserialize<list<object>> right that's not the format yeah I was just approaching it the wrong way because I didn't look at the data

mtreit•3y ago

The point is that you would use that for data that is formatted like the example I gave above.

BigggMoustacheOP•3y ago

Yeah that's how the bulk data is formatted I tried that first which is why I was on this path lol couldn't get that sorted either xD. well I may just comment here for you when I try the bulk data again. thank you very much for the help. yes the return from the api was the {"cards": {...} thing I couldn't figure out how to send specific delimiters to it, but that's not really a C# question lol

mtreit•3y ago

(Invoke-WebRequest "https://api.magicthegathering.io/v1/cards").Content

(Invoke-WebRequest "https://api.magicthegathering.io/v1/cards").Content

BigggMoustacheOP•3y ago

lol why is this a bruh moment? I have 0 experience with this jsyk xD I did a specific card via \card\cardIdNumber instead of a query to get a single card and it returned JSON in the same format. Unless you meant something else. I lied actually. It is inconsistent. lol. I figured it'd automatically wrap it in an array so it could be deserialized the same way every time. Hey one more question if you don't mind. There's SDK available for this API and .net but I'm avoiding to learn more about .net and not their SDK. Does that make sense? Or should I just use the SDK and this hardship is a bit of a waste of time?

mtreit•3y ago

@rtreit probably loves this question... My twin brother. He doesn't like SDKs

BigggMoustacheOP•3y ago

lmaooo I figured it would be a valuable learning experience. Was I wrong?

mtreit•3y ago

Using the raw web calls instead of the SDK is absolutely a valuable learning experience

BigggMoustacheOP•3y ago

I'll probably take up the SDK at some point to make learning other things easier, but for now it seemed like a good choice. most awesome. Thanks for the reassurance bud. If you have suggestion for what specifically to git gud with in this regard I'm all ears xD I was just gonna pick things that looked relevant from the docs and try implementing whatever

rtreit•3y ago

^this

mtreit•3y ago

Just keep doing what you're doing I think

BigggMoustacheOP•3y ago

aight. Thanks again. blobthumbsup

Unknown User•3y ago

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mtreit•3y ago

I only used System.Text.Json for this experiment

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BigggMoustacheOP•3y ago

oh I didn't know that was a thing thanks man

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BigggMoustacheOP•3y ago

could you edit in the code I did? so i can see easier to compare?

Unknown User•3y ago

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BigggMoustacheOP•3y ago

do you mean don't pass the response to a string first?

Unknown User•3y ago

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BigggMoustacheOP•3y ago

alright will do

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mtreit•3y ago

I'm not sure what you're saying so 🙂

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mtreit•3y ago

https://tenor.com/view/horse-horse-shock-gif-23419738

Tenor

BigggMoustacheOP•3y ago

lmao i'm gonna try and do that in a bit thanks again

Unknown User•3y ago

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BigggMoustacheOP•3y ago

yeah that makes a ton of sense

Unknown User•3y ago

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BigggMoustacheOP•3y ago

so i can deserialize the object that gets the json directly i didn't know that

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BigggMoustacheOP•3y ago

tbh i didn't even know what that object is because i always see it as var isn't it just a string anyways?

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mtreit•3y ago

I really have no idea what @tebeco is talking about but as someone who doesn't know json I assume he has some point

BigggMoustacheOP•3y ago

yeah for sure. I'm just learning it so i didn't bother doing the extras

Unknown User•3y ago

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mtreit•3y ago

I'm aware of this but have no idea how it applies to the code examples in this thread

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BigggMoustacheOP•3y ago

hey can you write out what you mean for me?

        private static async Task ProcessRepositories()
        {
            var stringTask = client.GetStringAsync(
                "https://api.magicthegathering.io/v1/cards?name=avacyn");
            var msg = await stringTask;
            var cards = JsonSerializer.Deserialize<Rootobject>(msg);
        }

        private static async Task ProcessRepositories()
        {
            var stringTask = client.GetStringAsync(
                "https://api.magicthegathering.io/v1/cards?name=avacyn");
            var msg = await stringTask;
            var cards = JsonSerializer.Deserialize<Rootobject>(msg);
        }

here's the original method just so i can see what you're saying

Unknown User•3y ago

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BigggMoustacheOP•3y ago

oh crap lmao that's uh, a huge improvement

mtreit•3y ago

What does that have to do with utf8?

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BigggMoustacheOP•3y ago

it's a lot less data getting created and dumped for no reason

mtreit•3y ago

System.Text.Json doesn't care? I'm missing something

Unknown User•3y ago

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BigggMoustacheOP•3y ago

what does GetJsonAsync come from?

Unknown User•3y ago

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BigggMoustacheOP•3y ago

nope. I saw some stuff about blazor

Unknown User•3y ago

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BigggMoustacheOP•3y ago

but I'm not using anything blazor googling the command

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mtreit•3y ago

I guess I need to see a benchmark

BigggMoustacheOP•3y ago

well json.http isn't it xD

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mtreit•3y ago

That wasn't a joke <:PES_SadGe:814280618959568896>

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BigggMoustacheOP•3y ago

I'm supposed to be doing shoulder shrugs right now 👀

Unknown User•3y ago

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BigggMoustacheOP•3y ago

oh no i was just shitposting lol. I'm sitting her etrying to get this package to work instead of finishing workout

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mtreit•3y ago

Just do the simplest thing possible and don't worry about micro-optimization

BigggMoustacheOP•3y ago

i added from package manager but still not working

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BigggMoustacheOP•3y ago

not recognizing the command saved and reopened 1 sec

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS1061    'HttpClient' does not contain a definition for 'GetJsonAsync' and no accessible extension method 'GetJsonAsync' accepting a first argument of type 'HttpClient' could be found (are you missing a using directive or an assembly reference?)    MTGCardDownloader    C:\Users\samue\source\repos\Goofin\MTGCardDownloader\MTGCardDownloader\MTGCardDownloader\Program.cs    20    Active

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS1061    'HttpClient' does not contain a definition for 'GetJsonAsync' and no accessible extension method 'GetJsonAsync' accepting a first argument of type 'HttpClient' could be found (are you missing a using directive or an assembly reference?)    MTGCardDownloader    C:\Users\samue\source\repos\Goofin\MTGCardDownloader\MTGCardDownloader\MTGCardDownloader\Program.cs    20    Active

i installed from package manager and have using

BigggMoustacheOP•3y ago

Unknown User•3y ago

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BigggMoustacheOP•3y ago

is it because client is HttpClient?

Unknown User•3y ago

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BigggMoustacheOP•3y ago

LMAO no error now 1 sec lmao because I read getfromjsonasyn when googling and didn't catch it derp Hot diggity that's cool man thanks a ton for telling me about that package what's BCL Oh. I had to add it 🤷🏻‍♂️ what that means, idk. lmao. yeah wasn't available to HttpClient until added unless i did something wrong which is always a possibility xD

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Accord•3y ago

✅ This post has been marked as answered!

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I can't JSON to List ;_; [Answered]