C
C#•2y ago
「ᴜɴɪᴄᴜʀꜱᴀʟ」

❔ 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
Pobiega•2y 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.
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
I read through this, but how do i create a List of objects with this?
Pobiega
Pobiega•2y 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.
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y 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
Pobiega•2y ago
and each of these "configurations" have their own structure? in your example above they have the same structure
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
yeah, they have the same structure
Pobiega
Pobiega•2y 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
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
I already tried, but i doesnt work out, i can send it in, but its very long due to 52 variables
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
Pobiega
Pobiega•2y ago
... why are those not just auto-properties?
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
What do you mean?
Pobiega
Pobiega•2y 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
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
I found it on stackoverflow tbh, so i dont need that _A variables?
Pobiega
Pobiega•2y 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
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
okay i changed that
Pobiega
Pobiega•2y ago
is it called "Name" or "ConfigName" in your JSON?
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
ConfigName
Pobiega
Pobiega•2y ago
but you want the .NET class property to just be "Name", right?
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
It doesnt make a difference
Pobiega
Pobiega•2y ago
either do 
[JsonPropertyName("ConfigName")]
public string Name { get; set; }
[JsonPropertyName("ConfigName")]
public string Name { get; set; }
or 
public string ConfigName { get; set; }
public string ConfigName { get; set; }
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
i used this one then, just for more practise in changing that in .NET
Pobiega
Pobiega•2y ago
okay
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y 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
Pobiega•2y 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
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
Okay changed it too
Pobiega
Pobiega•2y 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;
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
And configs is List Of Config then?
Pobiega
Pobiega•2y ago
yup
Pobiega
Pobiega•2y ago
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y 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
Pobiega•2y 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
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y ago
Okay, thank you. Is there a way to use this in .NET Framework and not .NET Core?
Pobiega
Pobiega•2y ago
¯\_(ツ)_/¯ framework is dead and buried
「ᴜɴɪᴄᴜʀꜱᴀʟ」
「ᴜɴɪᴄᴜʀꜱᴀʟ」OP•2y 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
Pobiega•2y 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
MODiX•2y 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
Accord•2y 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.
Want results from more Discord servers?
Add your server