C#•2d ago

error during deserialization of a yaml file

I'm building a system that add the config file in the yaml format feature in my program, the program will throw this exception:

YamlDotNet.Core.YamlException: Exception during deserialization
    System.InvalidCastException: Invalid cast from 'System.String' to 'dinfo.core.Handlers.ConfigTools.YamlConfigStructure'.

YamlDotNet.Core.YamlException: Exception during deserialization
    System.InvalidCastException: Invalid cast from 'System.String' to 'dinfo.core.Handlers.ConfigTools.YamlConfigStructure'.

i will link the file in the message

config-file.cs

21 Replies

SckabOP•2d ago

using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;
...

var yml = @"
name: George Washington
age: 89
height_in_inches: 5.75
addresses:
  home:
    street: 400 Mockingbird Lane
    city: Louaryland
    state: Hawidaho
    zip: 99970
";

var deserializer = new DeserializerBuilder()
    .WithNamingConvention(UnderscoredNamingConvention.Instance)  // see height_in_inches in sample yml 
    .Build();

//yml contains a string containing your YAML
var p = deserializer.Deserialize<Person>(yml);
var h = p.Addresses["home"];
System.Console.WriteLine($"{p.Name} is {p.Age} years old and lives at {h.Street} in {h.City}, {h.State}.");
// Output:
// George Washington is 89 years old and lives at 400 Mockingbird Lane in Louaryland, Hawidaho.

using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;
...

var yml = @"
name: George Washington
age: 89
height_in_inches: 5.75
addresses:
  home:
    street: 400 Mockingbird Lane
    city: Louaryland
    state: Hawidaho
    zip: 99970
";

var deserializer = new DeserializerBuilder()
    .WithNamingConvention(UnderscoredNamingConvention.Instance)  // see height_in_inches in sample yml 
    .Build();

//yml contains a string containing your YAML
var p = deserializer.Deserialize<Person>(yml);
var h = p.Addresses["home"];
System.Console.WriteLine($"{p.Name} is {p.Age} years old and lives at {h.Street} in {h.City}, {h.State}.");
// Output:
// George Washington is 89 years old and lives at 400 Mockingbird Lane in Louaryland, Hawidaho.

this is what is written in the docs

Keswiik•2d ago

Post the full stack trace of your error.

SckabOP•2d ago

it's too long

Keswiik•2d ago

$code

MODiX•2d ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat For longer snippets, use: https://paste.mod.gg/

Keswiik•2d ago

use the paste site

SckabOP•2d ago

thanks!

Keswiik•2d ago

I'm guessing something failed with deserializing your model and that's why this is breaking post the text in your yaml config file too

SckabOP•2d ago

yessir

SckabOP•2d ago

https://paste.mod.gg/atvyaayiqsav/0

BlazeBin - atvyaayiqsav

A tool for sharing your source code with the world!

SckabOP•2d ago

this is the error, and this is the file:

recursive = true

recursive = true

i want that the user is able to just put in the file only the configs he wants to change

Keswiik•2d ago

also, some critique on your model:

public class YamlConfigStructure
{
    [YamlMember(Alias = "recursive")]
    public bool RecursiveConfig { get; set; } = false;

    [YamlMember(Alias = "verbose")]
    public bool VerboseConfig { get; set; } = false;

    [YamlMember(Alias = "ignore_gitignore")]
    public bool IgnoreGitignoreConfig { get; set; } = false;

    [YamlMember(Alias = "no_tui")]
    public bool NoTuiConfig { get; set; } = false;

    [YamlMember(Alias = "ignored_files_or_directory")]
    public IgnoreFilesOrDirectory IgnoredFilesOrDirectory { get; set; } = new();
}

public class YamlConfigStructure
{
    [YamlMember(Alias = "recursive")]
    public bool RecursiveConfig { get; set; } = false;

    [YamlMember(Alias = "verbose")]
    public bool VerboseConfig { get; set; } = false;

    [YamlMember(Alias = "ignore_gitignore")]
    public bool IgnoreGitignoreConfig { get; set; } = false;

    [YamlMember(Alias = "no_tui")]
    public bool NoTuiConfig { get; set; } = false;

    [YamlMember(Alias = "ignored_files_or_directory")]
    public IgnoreFilesOrDirectory IgnoredFilesOrDirectory { get; set; } = new();
}

There's no real reason to append Config to every single property name. Making your model like this (and adding the YamlMember attributes) defeats the purpose of using:

var deserializer = new DeserializerBuilder()
            .WithNamingConvention(UnderscoredNamingConvention.Instance)
            .Build();

var deserializer = new DeserializerBuilder()
            .WithNamingConvention(UnderscoredNamingConvention.Instance)
            .Build();

SckabOP•2d ago

thanks! yeah, i need to change that

Keswiik•2d ago

Then you need to tell the deserializer that's what you want by using IgnoreUnmatchedProperties. It's failing to load because you only have 1 key in there.

SckabOP•2d ago

i modified it like this, but it still gives the same error message

config-file.cs

SckabOP•2d ago

in the error message isn't specified the exact line where the error accours, and this doesn't help me at all

Keswiik•2d ago

It's working fine for me locally

class Config {
    public bool Recursive { get; set; } = true;
    public bool Verbose { get; set; } = true;
}

class Program
{
    static void Main(string[] args) {
        var deserializer = new DeserializerBuilder()
            .WithNamingConvention(UnderscoredNamingConvention.Instance)
            .IgnoreUnmatchedProperties()
            .Build();

        var configStr = "recursive: false";

        var config = deserializer.Deserialize<Config>(configStr);
    }
}

class Config {
    public bool Recursive { get; set; } = true;
    public bool Verbose { get; set; } = true;
}

class Program
{
    static void Main(string[] args) {
        var deserializer = new DeserializerBuilder()
            .WithNamingConvention(UnderscoredNamingConvention.Instance)
            .IgnoreUnmatchedProperties()
            .Build();

        var configStr = "recursive: false";

        var config = deserializer.Deserialize<Config>(configStr);
    }
}

Keswiik•2d ago

SckabOP•2d ago

mmmmmmmmmmmmmmmmmmmmmmmmmmmh, this is really strange, i have the code on github, do you want to see the entire codebase (this is the first big project that i make so don't judge me pls)?

Keswiik•2d ago

no point in me digging through your entire codebase for a serialization problem for starters, i would try fixing your config model and see if that changes anything

SckabOP•2d ago

it's not really big tho, you can check the file really fast

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error during deserialization of a yaml file

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