Result.cs

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// TaskManagement.Domain/Shared/Result.cs
namespace TaskManagement.Domain.Common;
 
#pragma warning disable CS1570 // XML comment has badly formed XML
#pragma warning restore CS1570 // XML comment has badly formed XML
public class Result
{
    public bool IsSuccess {
        get;
    }
    public bool IsFailure => !IsSuccess;
    public IReadOnlyList<string> Errors {
        get;
    }
    protected Result(bool isSuccess, IEnumerable<string>? errors = null)
    {
        IsSuccess = isSuccess;
        Errors = errors?.ToList().AsReadOnly() ?? new List<string>().AsReadOnly();
    }
    public static Result Success() => new(true);
    public static Result Failure(string error) => new(false, new[] { error });
    public static Result Failure(IEnumerable<string> errors) => new(false, errors);
    public static Result<T> Success<T>(T value) => new(value);
    public static Result<T> Failure<T>(string error) => new(new[] { error });
    public static Result<T> Failure<T>(IEnumerable<string> errors) => new(errors);
}
 
#pragma warning disable CS1570 // XML comment has badly formed XML
#pragma warning restore CS1570 // XML comment has badly formed XML
public class Result<T> : Result
{
    public T? Value {
        get;
    }
    internal Result(T value) : base(true) => Value = value;
    internal Result(IEnumerable<string> errors) : base(false, errors) => Value = default;
    public TResult Match<TResult>(Func<T, TResult> onSuccess, Func<IReadOnlyList<string>, TResult> onFailure)
    {
        ArgumentNullException.ThrowIfNull(onSuccess);
        ArgumentNullException.ThrowIfNull(onFailure);
 
        return IsSuccess ? onSuccess(Value!) : onFailure(Errors);
    }
}