ResultProgram.cs

// See https://aka.ms/new-console-template for more information
using FluentResults;

//1. simple
Console.WriteLine(Divide(5, 0));


//2. fluent
var fluent = Result.Fail("error message 1")
                   .WithError("error message 2")
                   .WithError("error message 3")
                   .WithSuccess("success message 1");



//3. Try
var result = Result.Try(() =>
{
    if (IsInvalid())
    {
        return Result.Fail("Some error");
    }

    int id = DoSomethingCritical();

    return Result.Ok(id);

    static bool IsInvalid() => Random.Shared.NextDouble() > 0.5;

    static int DoSomethingCritical() => Random.Shared.NextDouble() > 0.5 ? 42 : throw new Exception("Bad");
});
Console.WriteLine(result);





static Result<int> Divide(int dividend, int divisor) =>
    divisor == 0 ? Result.Fail("Cannot divide by zero") : (dividend / divisor);

ResultTest.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FluentResults" Version="3.16.0" />
  </ItemGroup>

</Project>

ValueObjectsProgram.cs

// See https://aka.ms/new-console-template for more information
using Vogen;


var ttt = ScrapedString.TryFrom("\t   \t", out var parsed);
var tdtt = ScrapedString.From("\t   \t");


[ValueObject<string>(conversions: Conversions.TypeConverter | Conversions.SystemTextJson)]
public readonly partial struct Password { }

[ValueObject]
public readonly partial struct CustomerId { }

[ValueObject]
public readonly partial struct AccountId
{
    private static int NormalizeInput(int input)
    {
        // todo: normalize (sanitize) your input;
        return input;
    }
}

[ValueObject<decimal>]
public readonly partial struct PaymentAmount;

[ValueObject<string>(parsableForStrings: ParsableForStrings.GenerateMethodsAndInterface)]
public partial class ScrapedString
{
    private static Validation Validate(string value) =>
        value.Length == 0 ? Validation.Invalid("Can't be empty") : Validation.Ok;

    private static string NormalizeInput(string input) => input.Trim();
}



[ValueObject(typeof(float),
    conversions: Conversions.SystemTextJson,
    throws: typeof(ArgumentException),
    customizations: Customizations.TreatNumberAsStringInSystemTextJson)]
[Instance("Freezing", 0)]
[Instance("Boiling", 100)]
public readonly partial struct Celsius
{
    public static Validation Validate(float value) =>
        value >= -273 ? Validation.Ok : Validation.Invalid("Cannot be colder than absolute zero");
}

ValueObjectsTest.csproj

<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<OutputType>Exe</OutputType>
		<TargetFramework>net8.0</TargetFramework>
		<ImplicitUsings>enable</ImplicitUsings>
		<Nullable>enable</Nullable>

		<!--Be able to browse generated files-->
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)Generated</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

	<ItemGroup>
		<PackageReference Include="Vogen" Version="4.0.19" />
	</ItemGroup>

</Project>