C#•14mo ago

✅ JsonSerializer: Won't deserialize correctly

Hi there. Hoping someone can help me spot the source of my problem with my simple WinForms app here.
Basically, I can serialize an object correctly, but when I try to deserialize it, the "sub objects" don't populate correctly. No errors are thrown.
The object itself is a Dictionary<string, Dictionary<string, ScreenSettings>> Where the following class is in the same form: public class ScreenSettings { public string Name; public bool Hide; } During debug, I can see that the JSON is correctly created with Serialize, however when I Deserialize, the "ScreenSettings" are not populated. What am I doing wrong here?
Grateful in advance for the kind help.

9 Replies

Pobiega•14mo ago

can you paste the json and the class definitions?

cap5lut•14mo ago

STJ ignores fields by default, so u would either have to make these properties (thats usually the better way anyway), or pass correctly configured options along: https://learn.microsoft.com/en-us/dotnet/api/system.text.json.jsonserializeroptions.includefields?view=net-7.0#system-text-json-jsonserializeroptions-includefields

MODiX•14mo ago

Thinker

REPL Result: Success

public class ScreenSettings
{
    public string Name { get; set; }
    public bool Hide { get; set; }
}

var json = """
{
  "Foo": {
    "Bar": {
      "Name": "baz",
      "Hide": true
    }
  }
}
""";

System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, ScreenSettings>>>(json)

public class ScreenSettings
{
    public string Name { get; set; }
    public bool Hide { get; set; }
}

var json = """
{
  "Foo": {
    "Bar": {
      "Name": "baz",
      "Hide": true
    }
  }
}
""";

System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, ScreenSettings>>>(json)

Result: Dictionary<string, Dictionary<string, ScreenSettings>>

{
  "Foo": {
    "Bar": {
      "name": "baz",
      "hide": true
    }
  }
}

{
  "Foo": {
    "Bar": {
      "name": "baz",
      "hide": true
    }
  }
}

Compile: 578.230ms | Execution: 59.356ms | React with ❌ to remove this embed.

som45oulOP•14mo ago

Thanks. I did add the IncludeFields option, but it didn't seem to make any difference, unfortunately. I'll try using properties to see if that makes a difference. Thanks for the quick response!

cap5lut•14mo ago

then u did something wrong:

MODiX•14mo ago

cap5lut

REPL Result: Success

internal class ScreenSettings
{
    public string Name;
    public bool Hide;
}


var options = new System.Text.Json.JsonSerializerOptions() 
{
    IncludeFields = true
};

var json = """
{
  "Foo": {
    "Bar": {
      "Name": "baz",
      "Hide": true
    }
  }
}
""";

System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, ScreenSettings>>>(json, options)

internal class ScreenSettings
{
    public string Name;
    public bool Hide;
}


var options = new System.Text.Json.JsonSerializerOptions() 
{
    IncludeFields = true
};

var json = """
{
  "Foo": {
    "Bar": {
      "Name": "baz",
      "Hide": true
    }
  }
}
""";

System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, ScreenSettings>>>(json, options)

Result: Dictionary<string, Dictionary<string, ScreenSettings>>

{
  "Foo": {
    "Bar": {
      "name": "baz",
      "hide": true
    }
  }
}

{
  "Foo": {
    "Bar": {
      "name": "baz",
      "hide": true
    }
  }
}

Compile: 594.205ms | Execution: 72.083ms | React with ❌ to remove this embed.

som45oulOP•14mo ago

Well, that worked. I took the bot's advice and yours, and made them properties ... bingo! Thank you for the help, folks.

cap5lut•14mo ago

but yeah, making it properties is better anyway ;p if this answers ur question, dont forget to $close this thread 🙂

MODiX•14mo ago

Use the /close command to mark a forum thread as answered

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✅ JsonSerializer: Won't deserialize correctly