C#•6mo ago

JsonSerialization Help

I have this class in C# (functionallity removed)

public class Command
{
    [JsonIgnore]
    public IEnumerable<Flag> Flags => _flags;
    [JsonIgnore]
    public IEnumerable<string> AllowedFlags => _allowedFlags;
    [JsonPropertyName("command")]
    public string Name { get; }

    [JsonPropertyName("allowedFlags")]
    private readonly HashSet<string> _allowedFlags;
    [JsonPropertyName("flags")]
    private readonly List<Flag> _flags = [];
    [JsonPropertyName("arguments")]
    private readonly List<string> _arguments;

public class Command
{
    [JsonIgnore]
    public IEnumerable<Flag> Flags => _flags;
    [JsonIgnore]
    public IEnumerable<string> AllowedFlags => _allowedFlags;
    [JsonPropertyName("command")]
    public string Name { get; }

    [JsonPropertyName("allowedFlags")]
    private readonly HashSet<string> _allowedFlags;
    [JsonPropertyName("flags")]
    private readonly List<Flag> _flags = [];
    [JsonPropertyName("arguments")]
    private readonly List<string> _arguments;

A record that allows parsing of multiple commands:

[JsonSerializable(typeof(CommandConfig))]
public record CommandConfig
{
    [JsonPropertyName("commands")]
    public IList<Command> Commands { get; init; }
}

[JsonSerializable(typeof(CommandConfig))]
public record CommandConfig
{
    [JsonPropertyName("commands")]
    public IList<Command> Commands { get; init; }
}

and this is the json file:

{
    "commands": [
        {
            "command": "log",
            "allowedFlags": ["pretty"],
            "arguments": [],
            "flags": {
                "Name": "pretty",
                "Value": "%h~%cn~%ch~%cI~%s"
            }
        }
    ]
}

{
    "commands": [
        {
            "command": "log",
            "allowedFlags": ["pretty"],
            "arguments": [],
            "flags": {
                "Name": "pretty",
                "Value": "%h~%cn~%ch~%cI~%s"
            }
        }
    ]
}

I get this error:

Unhandled exception. System.InvalidOperationException: Each parameter in the deserialization constructor on type 'BL.Core.Command' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. Fields are only considered when 'JsonSerializerOptions.IncludeFields' is enabled. The match can be case-insensitive.

Unhandled exception. System.InvalidOperationException: Each parameter in the deserialization constructor on type 'BL.Core.Command' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. Fields are only considered when 'JsonSerializerOptions.IncludeFields' is enabled. The match can be case-insensitive.

Serialization has the IncludeFields option set to true and all properties has JsonIgnore on them. Can someone please help?

19 Replies

sibber•6mo ago

flags isnt a list its a Dict<string, string> but thats a weird api why even make that a dictionary i think in this case youd need an ordered list of key value pairs and manually map it

המשוררOP•6mo ago

youre correct i've changed it to a list of dict<string, string>

"flags": [
    {
        "name": "pretty",
        "value": "%h~%cn~%ch~%cI~%s"
    }
]

"flags": [
    {
        "name": "pretty",
        "value": "%h~%cn~%ch~%cI~%s"
    }
]

still not working though

sibber•6mo ago

right but now the issue is when you have multiple flags youre going to have more than one "name" key and more than one "value" key i assume see what i mean? oh

המשוררOP•6mo ago

so flags should be:

"flags": {
  "flagname": "flagvalue",
}

"flags": {
  "flagname": "flagvalue",
}

sibber•6mo ago

wait so is this the correct json? because this is now an array of objects

המשוררOP•6mo ago

still incorrect

sibber•6mo ago

im lost is this your api? what do you want to do exactly?

המשוררOP•6mo ago

flag is a simple record

public record Flag(string Name, string Value);

public record Flag(string Name, string Value);

maybe I should've done this one different? it says the problem is in the Command class

sibber•6mo ago

in this case it would serialize to

[
    { "pretty": "blabla" },
    ...
]

[
    { "pretty": "blabla" },
    ...
]

but what are you trying to do? if you don't want the serializer to use the constructor there's probably an attribute for that

המשוררOP•6mo ago

There is but it doesn't matter ig

sibber•6mo ago

wdym? that's why you're getting the exception

המשוררOP•6mo ago

I created this

[JsonConstructor]
public Command(
    string name,
    HashSet<string> allowedFlags,
    List<Flag> flags,
    List<string> arguments)
{
    Name = name;
    _allowedFlags = allowedFlags;
    _flags = flags;
    _arguments = arguments;
}

[JsonConstructor]
public Command(
    string name,
    HashSet<string> allowedFlags,
    List<Flag> flags,
    List<string> arguments)
{
    Name = name;
    _allowedFlags = allowedFlags;
    _flags = flags;
    _arguments = arguments;
}

is has everything even names are the same between json and variables like it should still error

sibber•6mo ago

and whats the entire json youre deserializing?

המשוררOP•6mo ago

{
    "commands": [
        {
            "name": "log",
            "allowedFlags": [ "pretty" ],
            "arguments": [],
            "flags": [
                {
                    "pretty": "%h~%cn~%ch~%cI~%s"
                }
            ]
        }
    ]
}

{
    "commands": [
        {
            "name": "log",
            "allowedFlags": [ "pretty" ],
            "arguments": [],
            "flags": [
                {
                    "pretty": "%h~%cn~%ch~%cI~%s"
                }
            ]
        }
    ]
}

commands is a list of commands

sibber•6mo ago

lol i forgot how json worked this is wrong this is what your model looks like in json:

MODiX•6mo ago

sibber

REPL Result: Success

var t = new Command("test", [], [new("pretty", "test")], []);
var c = System.Text.Json.JsonSerializer.Serialize(t);

return c;

class Root
{
    public Command[] commands { get; set; }
}

class Command
{

public string Name { get; }
    public HashSet<string> _allowedFlags { get; }
 public   List<Flag> _flags { get; }
 public   List<string> _arguments {get; }

[System.Text.Json.Serialization.JsonConstructor]
public Command(
    string name,
    HashSet<string> allowedFlags,
    List<Flag> flags,
    List<string> arguments)
{
    Name = name;
    _allowedFlags = allowedFlags;
    _flags = flags;
    _arguments = arguments;
}
}
record Flag(string Name, string Value);

var t = new Command("test", [], [new("pretty", "test")], []);
var c = System.Text.Json.JsonSerializer.Serialize(t);

return c;

class Root
{
    public Command[] commands { get; set; }
}

class Command
{

public string Name { get; }
    public HashSet<string> _allowedFlags { get; }
 public   List<Flag> _flags { get; }
 public   List<string> _arguments {get; }

[System.Text.Json.Serialization.JsonConstructor]
public Command(
    string name,
    HashSet<string> allowedFlags,
    List<Flag> flags,
    List<string> arguments)
{
    Name = name;
    _allowedFlags = allowedFlags;
    _flags = flags;
    _arguments = arguments;
}
}
record Flag(string Name, string Value);

Result: string

{"Name":"test","_allowedFlags":[],"_flags":[{"Name":"pretty","Value":"test"}],"_arguments":[]}

{"Name":"test","_allowedFlags":[],"_flags":[{"Name":"pretty","Value":"test"}],"_arguments":[]}

Compile: 473.919ms | Execution: 80.263ms | React with ❌ to remove this embed.

sibber•6mo ago

typing code on my phone is a pita

המשוררOP•6mo ago

How can I make it without underscore

sibber•6mo ago

thats just because i copy pasted the properties because im lazy you can name them whatever you want and make it case insensitive

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