C#•2y ago

WPF read and write to Json [Answered]

The title says it all, I don't know how to read and write to Json properly. I tried some things but they don't seem to work

        static List<persondata> persondata()
        {
            string fileName = @"C:\Users\elko\source\repos\JsonData\JsonData\bin\Debug\net6.0-windows\Persons.json";
            if (File.Exists(fileName))
            {
                var persons = JsonConvert.DeserializeObject<List<persondata>>
                    (File.ReadAllText(fileName));

                return persons;
            }
            return null;
        }
    }

        static List<persondata> persondata()
        {
            string fileName = @"C:\Users\elko\source\repos\JsonData\JsonData\bin\Debug\net6.0-windows\Persons.json";
            if (File.Exists(fileName))
            {
                var persons = JsonConvert.DeserializeObject<List<persondata>>
                    (File.ReadAllText(fileName));

                return persons;
            }
            return null;
        }
    }

i have looked for tutorials guides everywhere, but nothing worked for me. I must be doing something wrong

30 Replies

ero•2y ago

what does the json look like, and what does your persondata class look like

DayKnight•2y ago

My class is just this

    public class persondata
    {
        public string name { get; set; }
        public string address { get; set; }
        public string city { get; set; }
    }

    public class persondata
    {
        public string name { get; set; }
        public string address { get; set; }
        public string city { get; set; }
    }

My Json is empty right now

ero•2y ago

i mean if the json is empty, what data do you expect to deserialize into the list?

DayKnight•2y ago

<a:aPES4_WeirdStare:827518462745772084> Whops I forgot, that I actually had to have something in my Json. Thanks xd

Unknown User•2y ago

Message Not Public

Pobiega•2y ago

Be wary of mixing newtonsoft with System.Text.Json thou

ero•2y ago

can nsj/stj work with init props?

Unknown User•2y ago

Message Not Public

ero•2y ago

also your code won't work will it

public record PersonData(
  [JsonPropertyName("name")] string Name,
  [JsonPropertyName("address")] string Address,
  [JsonPropertyName("city")] string City
);

public record PersonData(
  [JsonPropertyName("name")] string Name,
  [JsonPropertyName("address")] string Address,
  [JsonPropertyName("city")] string City
);

this is probably what you meant

Unknown User•2y ago

Message Not Public

DayKnight•2y ago

Wow thanks everyone, I had no idea about the PascalCase and camelCase

TheRanger•2y ago

JsonConvert.DeserializeObject is from Newtonsoft Package so use [JsonProperty] instead

ero•2y ago

https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions

Unknown User•2y ago

Message Not Public

TheRanger•2y ago

newtonsoft isnt case sensitive i think

Unknown User•2y ago

Message Not Public

ero•2y ago

stj has JsonConvert?

Unknown User•2y ago

Message Not Public

ero•2y ago

i've only ever used JsonSerializer

TheRanger•2y ago

No the attribute JsonPropertyName is totally useless there

Unknown User•2y ago

Message Not Public

TheRanger•2y ago

and this JsonSerializer.Deserialize<

Unknown User•2y ago

Message Not Public

MODiX•2y ago

tebeco#0205

REPL Result: Success

using System.Text.Json;
using System.Text.Json.Serialization;

public record PersonData(
  [property: JsonPropertyName("name")] string Name,
  [property: JsonPropertyName("address")] string Address,
  [property: JsonPropertyName("city")] string City
);

var json = """
[
  {
    "name": "x1",
    "address": "y1",
    "city": "z1"
  },
  {
    "name": "x2",
    "address": "y2",
    "city": "z2"
  }
]
""";

var people = System.Text.Json.JsonSerializer.Deserialize<List<PersonData>>(json);

(people[0], people[1])

using System.Text.Json;
using System.Text.Json.Serialization;

public record PersonData(
  [property: JsonPropertyName("name")] string Name,
  [property: JsonPropertyName("address")] string Address,
  [property: JsonPropertyName("city")] string City
);

var json = """
[
  {
    "name": "x1",
    "address": "y1",
    "city": "z1"
  },
  {
    "name": "x2",
    "address": "y2",
    "city": "z2"
  }
]
""";

var people = System.Text.Json.JsonSerializer.Deserialize<List<PersonData>>(json);

(people[0], people[1])

Result: ValueTuple<PersonData, PersonData>

{
  "item1": {
    "name": "x1",
    "address": "y1",
    "city": "z1"
  },
  "item2": {
    "name": "x2",
    "address": "y2",
    "city": "z2"
  }
}

{
  "item1": {
    "name": "x1",
    "address": "y1",
    "city": "z1"
  },
  "item2": {
    "name": "x2",
    "address": "y2",
    "city": "z2"
  }
}

Compile: 639.697ms | Execution: 93.213ms | React with ❌ to remove this embed.

TheRanger•2y ago

iirc, stj is case sensitive, but u can pass an option settings to make it case insensitive

Unknown User•2y ago

Message Not Public

DayKnight•2y ago

Wow thanks everyone, I appreciate it a lot! It actually works. I can write to my Json. I don't know if it reads it, but I can suddenly write to it, I have not checked if it reads yet. Thanks! 👍 cathi

Unknown User•2y ago

Message Not Public

DayKnight•2y ago

Ah okay, that's fine. I don't have a preference, as long as I learn a way to read and write to Json. Doesn't matter which way to me. I appreciate all the help catlaugh

Accord•2y ago

✅ This post has been marked as answered!

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WPF read and write to Json [Answered]