OperationResult

ReadMe.md

OperationResult is a nice way to return success error messages out of service classes.

IOperationResult

using System.Collections.Generic;

public interface IOperationResult
{
	public bool Succeeded { get; }

	public IEnumerable<OperationError> Errors { get; }
}

public interface IOperationResult<out T>: IOperationResult
{
	public T Value { get; }
}

OperationResult.cs

using System.Collections.Generic;

public class OperationResult: IOperationResult
    {
        public bool Succeeded { get; init; }

        public IEnumerable<OperationError> Errors { get; init; } = new List<OperationError>();

        public static OperationResult Success { get; } = new() { Succeeded = true };
        
        public static OperationResult<T> SucceededWithValue<T>(T value)
        {
            return new()
            {
                Succeeded = true,
                Value = value
            };
        }

        public static OperationResult Failed(params OperationError[] errors)
        {
            var result = new OperationResult
            {
                Succeeded = false,
                Errors = errors ?? Array.Empty<OperationError>()
            };
            return result;
        }

        public static OperationResult Failed(IEnumerable<OperationError> errors)
        {
            var result = new OperationResult
            {
                Succeeded = false,
                Errors = errors ?? Array.Empty<OperationError>()
            };
            return result;
        }

        public static OperationResult<T> Failed<T>(params OperationError[] errors)
        {
            var result = new OperationResult<T>
            {
                Succeeded = false,
                Errors = errors ?? Array.Empty<OperationError>()
            };
            return result;
        }

        public static OperationResult<T> Failed<T>(IEnumerable<OperationError> errors)
        {
            var result = new OperationResult<T>
            {
                Succeeded = false,
                Errors = errors ?? Array.Empty<OperationError>()
            };
            return result;
        }
    }

    public class OperationResult<T> : OperationResult, IOperationResult<T>
    {
        public T Value { get; init; }
    }

    public class OperationError
    {
        public OperationError(string description)
        {
            Description = description;
        }

        /// <summary>
        /// Gets or sets the description for this error.
        /// </summary>
        /// <value>
        /// The description for this error.
        /// </value>
        public string Description { get; set; }

        public static implicit operator OperationError(string description)
        {
            return new(description);
        }
    }