commit f099722ec2001060e6b43de1ba1b8fd6ed536379
parent db7ef27490a5a553f6c328af3b20982680affaac
Author: Markus Hanetzok <markus@hanetzok.net>
Date: Fri, 24 Oct 2025 14:55:32 +0200
Add result pattern implementation
- Introduced `Result` for operations without return values.
- Added `TypedResult<T>` for operations with typed return values.
- Implemented `ErrorDetail` for handling error information.
- Updated project metadata and added GPL-3.0 license.
Diffstat:
6 files changed, 1092 insertions(+), 4 deletions(-)
diff --git a/SimpleResults/Errors/ErrorDetail.cs b/SimpleResults/Errors/ErrorDetail.cs
@@ -0,0 +1,64 @@
+/*
+ This file is part of Foobar.
+
+ Foobar is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Foobar is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Foobar. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+using SimpleResults.Results;
+
+namespace SimpleResults.Errors;
+
+/// <summary>
+/// Represents detailed information about an error that occurred during an operation.
+/// </summary>
+/// <remarks>
+/// This class encapsulates error information including a numeric error code, a descriptive message,
+/// and an optional exception object. It is typically used in conjunction with <see cref="TypedResult{T}"/>
+/// and <see cref="ErrorCode"/> to provide structured error information when operations fail.
+/// </remarks>
+/// <param name="message">A numeric code identifying the type of error that occurred.</param>
+/// <param name="exception">A human-readable description of the error.</param>
+/// <param name="exception">An optional exception that caused the error. Can be null if the error
+/// was not caused by an exception.</param>
+public class ErrorDetail(
+ int errorCode,
+ string message,
+ Exception? exception = null)
+{
+ /// <summary>
+ /// Gets or sets the numeric error code that identifies the type of error.
+ /// </summary>
+ /// <value>
+ /// An integer representing a specific error type. The meaning of specific codes
+ /// is defined by the application using this class.
+ /// </value>
+ public int ErrorCode { get; set; } = errorCode;
+
+ /// <summary>
+ /// Gets or sets the human-readable error message describing what went wrong.
+ /// </summary>
+ /// <value>
+ /// A string containing a descriptive error message suitable for logging or displaying to users.
+ /// </value>
+ public string Message { get; set; } = message;
+
+ /// <summary>
+ /// Gets or sets the exception that caused the error, if applicable.
+ /// </summary>
+ /// <value>
+ /// An <see cref="Exception"/> object if the error was caused by an exception;
+ /// otherwise, <c>null</c>.
+ /// </value>
+ public Exception? Exception { get; set; } = exception;
+}
+\ No newline at end of file
diff --git a/SimpleResults/LICENSE b/SimpleResults/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+ 13. Use with the GNU Affero General Public License.
+
+ Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+ If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
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+to choose that version for the Program.
+
+ Later license versions may give you additional or different
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+later version.
+
+ 15. Disclaimer of Warranty.
+
+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ 16. Limitation of Liability.
+
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+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/SimpleResults/README b/SimpleResults/README
@@ -0,0 +1,29 @@
+SimpleResults
+=============
+A lightweight .NET library implementing the Result pattern for elegant error handling without exceptions.
+
+Overview
+--------
+SimpleResults provides a type-safe way to handle operation outcomes in your
+.NET applications. Instead of throwing exceptions for expected failures,
+you can return Result objects that explicitly indicate success or failure
+with detailed error information.
+
+Features
+--------
+- Result Pattern Implementation: Clean separation between success and failure paths
+- Type-Safe Error Handling: Avoid exception overhead for expected failures
+- Typed Results: Return values along with success/failure status
+- Detailed Error Information: Capture error codes, messages, and exceptions
+- Simple API: Easy-to-use factory methods for creating results
+
+
+Installation
+------------
+Add the SimpleResults library to your project.
+
+Core Components
+---------------
+- Result: Represents the outcome of an operation that doesn't return a value.
+- TypedResult<T>: Represents the outcome of an operation that returns a value of type T.
+- ErrorDetail: Encapsulates error information including error code, message, and optional exception.
+\ No newline at end of file
diff --git a/SimpleResults/Results/Result.cs b/SimpleResults/Results/Result.cs
@@ -0,0 +1,145 @@
+/*
+ This file is part of Foobar.
+
+ Foobar is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Foobar is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Foobar. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+using SimpleResults.Errors;
+
+namespace SimpleResults.Results;
+
+/// <summary>
+/// Represents the result of an operation that does not return a value, indicating either success or failure.
+/// </summary>
+/// <remarks>
+/// This class implements the Result pattern, providing a type-safe way to handle operation outcomes
+/// without throwing exceptions. It encapsulates success/failure state and error details.
+/// Use <see cref="TypedResult{T}"/> when the operation needs to return a value on success.
+/// </remarks>
+public class Result
+{
+ /// <summary>
+ /// Gets or sets a value indicating whether the operation completed successfully.
+ /// </summary>
+ /// <value>
+ /// <c>true</c> if the operation succeeded; otherwise, <c>false</c>.
+ /// </value>
+ public bool IsSuccess { get; set; }
+
+ /// <summary>
+ /// Gets a value indicating whether the operation failed.
+ /// </summary>
+ /// <value>
+ /// <c>true</c> if the operation failed; otherwise, <c>false</c>.
+ /// This is the inverse of <see cref="IsSuccess"/>.
+ /// </value>
+ public bool IsFailure => !IsSuccess;
+
+ /// <summary>
+ /// Gets or sets the error details when the operation fails.
+ /// </summary>
+ /// <value>
+ /// An <see cref="ErrorDetail"/> object containing information about the failure,
+ /// or <c>null</c> if the operation succeeded.
+ /// </value>
+ public ErrorDetail? ErrorDetail { get; set; }
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="Result"/> class representing a successful operation.
+ /// </summary>
+ /// <remarks>
+ /// This constructor is protected and should not be called directly.
+ /// Use the <see cref="Success"/> factory method instead.
+ /// </remarks>
+ protected Result()
+ {
+ IsSuccess = true;
+ }
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="Result"/> class representing a failed operation.
+ /// </summary>
+ /// <param name="errorDetail">The details of the error that caused the operation to fail.</param>
+ /// <remarks>
+ /// This constructor is protected and should not be called directly.
+ /// Use the Failure factory methods instead.
+ /// </remarks>
+ protected Result(ErrorDetail errorDetail)
+ {
+ IsSuccess = false;
+ ErrorDetail = errorDetail;
+ }
+
+ /// <summary>
+ /// Creates a new <see cref="Result"/> representing a successful operation.
+ /// </summary>
+ /// <returns>A <see cref="Result"/> instance with <see cref="IsSuccess"/> set to <c>true</c>.</returns>
+ /// <example>
+ /// <code>
+ /// public Result ProcessData()
+ /// {
+ /// // ... perform operation ...
+ /// return Result.Success();
+ /// }
+ /// </code>
+ /// </example>
+ public static Result Success() => new();
+
+ /// <summary>
+ /// Creates a new <see cref="Result"/> representing a failed operation with the specified error details.
+ /// </summary>
+ /// <param name="error">The error details describing why the operation failed.</param>
+ /// <returns>A <see cref="Result"/> instance with <see cref="IsSuccess"/> set to <c>false</c>
+ /// and <see cref="ErrorDetail"/> populated with the provided error information.</returns>
+ /// <example>
+ /// <code>
+ /// public Result ProcessData()
+ /// {
+ /// if (data == null)
+ /// {
+ /// var error = new ErrorDetail(404, "Data not found");
+ /// return Result.Failure(error);
+ /// }
+ /// // ... continue processing ...
+ /// }
+ /// </code>
+ /// </example>
+ public static Result Failure(ErrorDetail error) => new(error);
+
+ /// <summary>
+ /// Creates a new <see cref="Result"/> representing a failed operation with the specified error information.
+ /// </summary>
+ /// <param name="code">A numeric error code identifying the type of failure.</param>
+ /// <param name="msg">A human-readable message describing the failure.</param>
+ /// <param name="e">An optional exception that caused the failure. Can be <c>null</c>.</param>
+ /// <returns>A <see cref="Result"/> instance with <see cref="IsSuccess"/> set to <c>false</c>
+ /// and <see cref="ErrorDetail"/> populated with the provided error information.</returns>
+ /// <example>
+ /// <code>
+ /// public Result ProcessData()
+ /// {
+ /// try
+ /// {
+ /// // ... perform operation ...
+ /// }
+ /// catch (Exception ex)
+ /// {
+ /// return Result.Failure(500, "Processing failed", ex);
+ /// }
+ /// return Result.Success();
+ /// }
+ /// </code>
+ /// </example>
+ public static Result Failure(int code, string msg, Exception? e) => new(new ErrorDetail(code, msg, e));
+}
+\ No newline at end of file
diff --git a/SimpleResults/Results/TypedResult.cs b/SimpleResults/Results/TypedResult.cs
@@ -0,0 +1,169 @@
+/*
+ This file is part of Foobar.
+
+ Foobar is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Foobar is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Foobar. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+using SimpleResults.Errors;
+
+namespace SimpleResults.Results;
+
+/// <summary>
+/// Represents the result of an operation that returns a value of type <typeparamref name="T"/>,
+/// indicating either success with a value or failure with error details.
+/// </summary>
+/// <typeparam name="T">The type of the value returned on successful operation.
+/// Must have a parameterless constructor.</typeparam>
+/// <remarks>
+/// This class implements the Result pattern with a typed return value, providing a type-safe way
+/// to handle operation outcomes without throwing exceptions. It encapsulates success/failure state,
+/// a return value (on success), and error details (on failure).
+/// Use <see cref="Result"/> when the operation does not need to return a value.
+/// </remarks>
+public class TypedResult<T> where T : new()
+{
+ /// <summary>
+ /// Gets or sets a value indicating whether the operation completed successfully.
+ /// </summary>
+ /// <value>
+ /// <c>true</c> if the operation succeeded; otherwise, <c>false</c>.
+ /// </value>
+ public bool IsSuccess { get; set; }
+
+ /// <summary>
+ /// Gets a value indicating whether the operation failed.
+ /// </summary>
+ /// <value>
+ /// <c>true</c> if the operation failed; otherwise, <c>false</c>.
+ /// This is the inverse of <see cref="IsSuccess"/>.
+ /// </value>
+ public bool IsFailure => !IsSuccess;
+
+ /// <summary>
+ /// Gets or sets the value returned by the successful operation.
+ /// </summary>
+ /// <value>
+ /// The value of type <typeparamref name="T"/> produced by the operation if it succeeded.
+ /// If the operation failed, this will be a default instance created using the parameterless constructor.
+ /// </value>
+ /// <remarks>
+ /// Always check <see cref="IsSuccess"/> before accessing this property to ensure the operation succeeded.
+ /// </remarks>
+ public T Value { get; set; } = new();
+
+ /// <summary>
+ /// Gets or sets the error details when the operation fails.
+ /// </summary>
+ /// <value>
+ /// An <see cref="ErrorDetail"/> object containing information about the failure,
+ /// or <c>null</c> if the operation succeeded.
+ /// </value>
+ public ErrorDetail? ErrorDetail { get; set; }
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="TypedResult{T}"/> class representing
+ /// a successful operation with a return value.
+ /// </summary>
+ /// <param name="value">The value produced by the successful operation.</param>
+ /// <remarks>
+ /// This constructor is protected and should not be called directly.
+ /// Use the <see cref="Success"/> factory method instead.
+ /// </remarks>
+ protected TypedResult(T value)
+ {
+ IsSuccess = true;
+ Value = value;
+
+ }
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="TypedResult{T}"/> class representing a failed operation.
+ /// </summary>
+ /// <param name="errorDetail">The details of the error that caused the operation to fail.</param>
+ /// <remarks>
+ /// This constructor is protected and should not be called directly.
+ /// Use the Failure factory methods instead.
+ /// </remarks>
+ protected TypedResult(ErrorDetail errorDetail)
+ {
+ IsSuccess = false;
+ ErrorDetail = errorDetail;
+ }
+
+ /// <summary>
+ /// Creates a new <see cref="TypedResult{T}"/> representing a successful operation with the specified value.
+ /// </summary>
+ /// <param name="value">The value produced by the successful operation.</param>
+ /// <returns>A <see cref="TypedResult{T}"/> instance with <see cref="IsSuccess"/> set to <c>true</c>
+ /// and <see cref="Value"/> set to the provided value.</returns>
+ /// <example>
+ /// <code>
+ /// public TypedResult<User> GetUser(int id)
+ /// {
+ /// var user = database.FindUser(id);
+ /// return TypedResult<User>.Success(user);
+ /// }
+ /// </code>
+ /// </example>
+ public static TypedResult<T> Success(T value) => new(value);
+
+ /// <summary>
+ /// Creates a new <see cref="TypedResult{T}"/> representing a failed operation with the specified error details.
+ /// </summary>
+ /// <param name="error">The error details describing why the operation failed.</param>
+ /// <returns>A <see cref="TypedResult{T}"/> instance with <see cref="IsSuccess"/> set to <c>false</c>
+ /// and <see cref="ErrorDetail"/> populated with the provided error information.</returns>
+ /// <example>
+ /// <code>
+ /// public TypedResult<User> GetUser(int id)
+ /// {
+ /// var user = database.FindUser(id);
+ /// if (user == null)
+ /// {
+ /// var error = new ErrorDetail(404, "User not found");
+ /// return TypedResult<User>.Failure(error);
+ /// }
+ /// return TypedResult<User>.Success(user);
+ /// }
+ /// </code>
+ /// </example>
+ public static TypedResult<T> Failure(ErrorDetail error) => new(error);
+
+ /// <summary>
+ /// Creates a new <see cref="TypedResult{T}"/> representing a failed operation
+ /// with the specified error information.
+ /// </summary>
+ /// <param name="code">A numeric error code identifying the type of failure.</param>
+ /// <param name="msg">A human-readable message describing the failure.</param>
+ /// <param name="e">An optional exception that caused the failure. Can be <c>null</c>.</param>
+ /// <returns>A <see cref="TypedResult{T}"/> instance with <see cref="IsSuccess"/> set to <c>false</c>
+ /// and <see cref="ErrorDetail"/> populated with the provided error information.</returns>
+ /// <example>
+ /// <code>
+ /// public TypedResult<User> GetUser(int id)
+ /// {
+ /// try
+ /// {
+ /// var user = database.FindUser(id);
+ /// return TypedResult<User>.Success(user);
+ /// }
+ /// catch (Exception ex)
+ /// {
+ /// return TypedResult<User>.Failure(500, "Database error", ex);
+ /// }
+ /// }
+ /// </code>
+ /// </example>
+ public static TypedResult<T> Failure(int code, string msg, Exception? e) => new(new ErrorDetail(code, msg, e));
+}
+\ No newline at end of file
diff --git a/SimpleResults/SimpleResults.csproj b/SimpleResults/SimpleResults.csproj
@@ -2,12 +2,15 @@
<PropertyGroup>
<TargetFramework>net9.0</TargetFramework>
- <LangVersion>latestmajor</LangVersion>
+ <Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
- <Copyright>(©) 2025 Markus Hanetzok</Copyright>
- <Authors>Markus Hanetzok</Authors>
+
<Version>0.1.0</Version>
- <Nullable>enable</Nullable>
+ <Authors>Markus Hanetzok</Authors>
+ <Description>Simple result pattern implementation for .NET</Description>
+ <PackageLicenseExpression>GPL-3.0</PackageLicenseExpression>
+ <RepositoryUrl>https://git.hanetzok.net/simpleresults</RepositoryUrl>
+ <Copyright>(©) 2025 Markus Hanetzok</Copyright>
</PropertyGroup>
</Project>
