Sam.Wrappers

This package contains classes and methods designed for managing operation results, errors, and paginated responses in .NET applications.

Installation

To install the Sam.Wrappers package, simply use the following command

dotnet add package Sam.Wrappers

Features

• BaseResult and BaseResult<T>

  • Handle operation results with an indication of success or failure.
  • Provide support for single or multiple errors.
  • Allow chaining and adding errors post-creation.
  • Implicitly convert from error or list of errors to BaseResult for flexible error handling.

• PagedResponse<T>

  • Manage paginated data responses, encapsulating data along with pagination metadata like page number, total pages, and total items.
  • Includes static factory methods to quickly generate paginated results.

• Error and ErrorCode

  • Define errors with an ErrorCode enum that covers standard HTTP status codes and custom application-specific errors.
  • Structure errors with optional descriptions and field names for context.

• AppException

  • Offers a variety of static methods in AppException class to throw exceptions based on different conditions such as null values, empty collections, out-of-range values, etc.
  • Easily integrates with ASP.NET Core applications through middleware for global exception handling.

Usage

BaseResult

The BaseResult and BaseResult<T> classes are used to handle operation results, allowing you to check for success or failure and manage errors.

using Sam.Wrappers;

// Create a successful result
var successResult = BaseResult.Ok();

// Create a failed result with an error
var error = new Error(ErrorCode.BadRequest, "Invalid data");
var failureResult = BaseResult.Failure(error);

PagedResponse

The PagedResponse<T> class is used to manage paginated responses in APIs and systems that require pagination.

using Sam.Wrappers;
using System.Collections.Generic;

// Sample data
var data = new List<string> { "Item1", "Item2", "Item3" };
int pageNumber = 1;
int pageSize = 3;
int totalCount = 3;

// Create a paginated response
var pagedResponse = PagedResponse<string>.Ok(data, totalCount, pageNumber, pageSize);

Error and ErrorCode

Use Error and ErrorCode to manage errors and refer to specific predefined error codes.

using Sam.Wrappers;

var error = new Error(ErrorCode.NotFound, "Item not found", "ItemId");

AppException

The AppException class and related middleware provide a streamlined way to handle application-specific exceptions and errors.

Example: Throwing Exceptions

using Sam.Wrappers;

// Throw a simple exception
AppException.Throw(ErrorCode.BadRequest, "Invalid request data");

// Throw an exception if a value is null
AppException.ThrowIfNull(someValue, ErrorCode.NotFound, "Value cannot be null", "SomeField");

// Throw an exception if a collection is empty
AppException.ThrowIfEmpty(someCollection, ErrorCode.NoContent, "Collection is empty", "SomeCollection");

Integrating with ASP.NET Core

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;

// In Startup.cs or Program.cs
public void ConfigureServices(IServiceCollection services)
{
    services.ConfigureAppExceptionHandling(options =>
    {
        options.StatusCode = 500; // Default status code for unhandled exceptions
    });
}

public void Configure(IApplicationBuilder app)
{
    app.UseAppExceptionHandling();
    app.UseRouting();
    // other middleware
}

This setup ensures that all AppException exceptions are caught and returned as structured JSON responses with appropriate HTTP status codes.

Contributing

Contributions are welcome! If you’d like to contribute, please follow these steps:

1. Fork the repository.
2. Create a new branch (git checkout -b feature/YourFeature).
3. Make your changes and commit them (git commit -am 'Add new feature').
4. Push to the branch (git push origin feature/YourFeature).
5. Open a Pull Request.

If you encounter any issues or have suggestions, feel free to open an issue in the repository.

License

This project is licensed under the MIT License.