Result<T>

Result pattern for explicit error handling without exceptions.

Properties

Property	Type	Description
IsSuccess	bool	Operation succeeded
IsFailure	bool	Operation failed
Data	T?	Success value
ErrorMessage	string?	Primary error message
Errors	IReadOnlyList<string>	All error messages
ErrorCode	string?	Error categorization code

Factory Methods

Method	Description
Success(T data)	Creates successful result
Failure(string message, string? code)	Creates failed result
Failure(IEnumerable<string> errors, string? code)	Multiple errors
Failure(Result result)	Copy errors from another result

Instance Methods

Method	Description
Map<TNew>(Func<T, TNew>)	Transform success value
OnSuccess(Action<T>)	Execute if successful
OnFailure(Action<IReadOnlyList<string>>)	Execute if failed
GetValueOrDefault(T?)	Get value or default

Usage

public async Task<Result&lt;User&gt;> CreateUserAsync(CreateUserCommand cmd)
{
    if (await _repo.EmailExistsAsync(cmd.Email))
        return Result&lt;User&gt;.Failure("Email already exists", "EMAIL_EXISTS");

    var user = new User(cmd.Email, cmd.Name);
    await _repo.AddAsync(user);
    return Result&lt;User&gt;.Success(user);
}