C#•16mo ago

❔ Reading a Json-File into a List Of Objects

Hey, i want to read a JSON File into a List of Objects. The JSON File looks like this:

{
  "Modes": [
    {
      "ConfigName": "Small Uppertext",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    },
    {
      "ConfigName": "Something Else",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    }
  ]
}

{
  "Modes": [
    {
      "ConfigName": "Small Uppertext",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    },
    {
      "ConfigName": "Something Else",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    }
  ]
}

I just shortened out the other letters. How can i import the JSON File into a List of Objects?

37 Replies

Pobiega•16mo ago

https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/how-to?pivots=dotnet-7-0

How to serialize and deserialize JSON using C# - .NET

Learn how to use the System.Text.Json namespace to serialize to and deserialize from JSON in .NET. Includes sample code.

Unicursal•16mo ago

I read through this, but how do i create a List of objects with this?

Pobiega•16mo ago

did you read the "deserialization" part?

How to read JSON as .NET objects (deserialize) A common way to deserialize JSON is to first create a class with properties and fields that represent one or more of the JSON properties. Then, to deserialize from a string or a file, call the JsonSerializer.Deserialize method. For the generic overloads, you pass the type of the class you created as the generic type parameter. For the non-generic overloads, you pass the type of the class you created as a method parameter. You can deserialize either synchronously or asynchronously.

Unicursal•16mo ago

Thats the only part i read through, but it explains only how to create an object from a json looking like this

{
      "ConfigName": "Something Else",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    }

{
      "ConfigName": "Something Else",
      "A": "ᴬ",
      "B": "ᴮ",
      "y": "ʸ",
      "z": "ᶻ"
    }

But i have stored multiple configurations in one json

Pobiega•16mo ago

and each of these "configurations" have their own structure? in your example above they have the same structure

Unicursal•16mo ago

yeah, they have the same structure

Pobiega•16mo ago

Then just make a class that has that structure and do JsonSerializer.Deserialize<List<MyClass>>(jsonStringVariable); oh, you have the "modes" wrapper, so just make a class that has that prop

Unicursal•16mo ago

I already tried, but i doesnt work out, i can send it in, but its very long due to 52 variables

Unicursal•16mo ago

config.txt

Pobiega•16mo ago

... why are those not just auto-properties?

Unicursal•16mo ago

What do you mean?

Pobiega•16mo ago

public string A { get; set; } no need for private string _A; and public string A { get => _A; set => _A = value; } just use public string A { get; set; }, it does the same thing

Unicursal•16mo ago

I found it on stackoverflow tbh, so i dont need that _A variables?

Pobiega•16mo ago

correct

public string Name { get; set; }
public string A { get; set; }
public string B { get; set; }
public string C { get; set; }
public string D { get; set; }
public string E { get; set; }
public string F { get; set; }
public string G { get; set; }
public string H { get; set; }
public string I { get; set; }
public string J { get; set; }
public string K { get; set; }
public string L { get; set; }
public string M { get; set; }
public string N { get; set; }
public string O { get; set; }
public string P { get; set; }
public string Q { get; set; }
public string R { get; set; }
public string S { get; set; }
public string T { get; set; }
public string U { get; set; }
public string V { get; set; }
public string W { get; set; }
public string X { get; set; }
public string Y { get; set; }
public string Z { get; set; }
public string a { get; set; }
public string b { get; set; }
public string c { get; set; }
public string d { get; set; }
public string e { get; set; }
public string f { get; set; }
public string g { get; set; }
public string h { get; set; }
public string i { get; set; }
public string j { get; set; }
public string k { get; set; }
public string l { get; set; }
public string m { get; set; }
public string n { get; set; }
public string o { get; set; }
public string p { get; set; }
public string q { get; set; }
public string r { get; set; }
public string s { get; set; }
public string t { get; set; }
public string u { get; set; }
public string v { get; set; }
public string w { get; set; }
public string x { get; set; }
public string y { get; set; }
public string z { get; set; }

public string Name { get; set; }
public string A { get; set; }
public string B { get; set; }
public string C { get; set; }
public string D { get; set; }
public string E { get; set; }
public string F { get; set; }
public string G { get; set; }
public string H { get; set; }
public string I { get; set; }
public string J { get; set; }
public string K { get; set; }
public string L { get; set; }
public string M { get; set; }
public string N { get; set; }
public string O { get; set; }
public string P { get; set; }
public string Q { get; set; }
public string R { get; set; }
public string S { get; set; }
public string T { get; set; }
public string U { get; set; }
public string V { get; set; }
public string W { get; set; }
public string X { get; set; }
public string Y { get; set; }
public string Z { get; set; }
public string a { get; set; }
public string b { get; set; }
public string c { get; set; }
public string d { get; set; }
public string e { get; set; }
public string f { get; set; }
public string g { get; set; }
public string h { get; set; }
public string i { get; set; }
public string j { get; set; }
public string k { get; set; }
public string l { get; set; }
public string m { get; set; }
public string n { get; set; }
public string o { get; set; }
public string p { get; set; }
public string q { get; set; }
public string r { get; set; }
public string s { get; set; }
public string t { get; set; }
public string u { get; set; }
public string v { get; set; }
public string w { get; set; }
public string x { get; set; }
public string y { get; set; }
public string z { get; set; }

is all you need

Unicursal•16mo ago

okay i changed that

Pobiega•16mo ago

is it called "Name" or "ConfigName" in your JSON?

Unicursal•16mo ago

ConfigName

Pobiega•16mo ago

but you want the .NET class property to just be "Name", right?

Unicursal•16mo ago

It doesnt make a difference

Pobiega•16mo ago

either do

[JsonPropertyName("ConfigName")]
public string Name { get; set; }

[JsonPropertyName("ConfigName")]
public string Name { get; set; }

public string ConfigName { get; set; }

public string ConfigName { get; set; }

Unicursal•16mo ago

i used this one then, just for more practise in changing that in .NET

Pobiega•16mo ago

okay

Unicursal•16mo ago

And this one? Isnt it need then too?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TextChanger
{
    public class ConfigList
    {
        private List<Config> configs;
        public List<Config> Configs { get => configs; set => configs = value; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TextChanger
{
    public class ConfigList
    {
        private List<Config> configs;
        public List<Config> Configs { get => configs; set => configs = value; }
    }
}

Pobiega•16mo ago

public class RootObject
{
    public List<Config> Modes { get; set; }
}

public class RootObject
{
    public List<Config> Modes { get; set; }
}

your property is called "Modes" so either use JsonPropertyName to change it, or just call it modes

Unicursal•16mo ago

Okay changed it too

Pobiega•16mo ago

now all you need is

string json = ""; // get a json string somehow, File.ReadAllText maybe
var obj = JsonSerializer.Deserialize<RootObject>(json);

var configs = obj.Modes;

string json = ""; // get a json string somehow, File.ReadAllText maybe
var obj = JsonSerializer.Deserialize<RootObject>(json);

var configs = obj.Modes;

Unicursal•16mo ago

And configs is List Of Config then?

Pobiega•16mo ago

yup

Pobiega•16mo ago

Unicursal•16mo ago

Okay, thank you :) Just one more question, is there a way i can check if the json has the correct format? And give an error or something? Or give default values if a letter doesnt have a value in the config?

Pobiega•16mo ago

default value, just assign a default value in your model ie public string l { get; set; } = "default value"; check for error, well, the Deserialize method can return null, so check for that you'll get an exception if the json is wacky

Unicursal•16mo ago

Okay, thank you. Is there a way to use this in .NET Framework and not .NET Core?

Pobiega•16mo ago

¯\_(ツ)_/¯ framework is dead and buried

Unicursal•16mo ago

Hm, okay, than i stick to Core. But how can I remove the other files from the Release Folder? I mean this one "runtimeconfig.json"

Pobiega•16mo ago

if you want to "release" your app, use dotnet publish that will package it for distribution you can even use single file publishing to make it a single .exe file $singlefile

MODiX•16mo ago

dotnet publish -c Release -r <runtime identifier> -p:PublishSingleFile=true Use of -r|--runtime implies --self-contained true. Add --self-contained false to publish as runtime-dependent. -r RID and -p:PublishSingleFile=true can be moved to .csproj as the following properties:

<RuntimeIdentifier>RID</RuntimeIdentifier>
<PublishSingleFile>true</PublishSingleFile>

<RuntimeIdentifier>RID</RuntimeIdentifier>
<PublishSingleFile>true</PublishSingleFile>

but to target multiple RIDs, you have to use dotnet publish with the -r option for each RID. You can also add -p:IncludeNativeLibrariesForSelfExtract=true to include native libraries (like Common Language Runtime dlls) in the output executable. You might want to instead publish your application compiled Ahead Of Time to native code, see $nativeaot. https://docs.microsoft.com/en-us/dotnet/core/deploying/single-file https://docs.microsoft.com/en-us/dotnet/core/rid-catalog https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-publish

Create a single file for application deployment - .NET

Learn what single file application is and why you should consider using this application deployment model.

.NET Runtime Identifier (RID) catalog

Learn about the runtime identifier (RID) and how RIDs are used in .NET.

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Reading a Json-File into a List Of Objects