BridgingIT.DevKit.Common.Abstractions 10.0.2-preview.0.8

Empowering developers with modular components for modern application development, centered around Domain-Driven Design principles.

Our goal is to empower developers by offering modular components that can be easily integrated into your projects. Whether you're working with repositories, commands, queries, or other components, the bITDevKit provides flexible solutions that can adapt to your specific needs.

This repository includes the complete source code for the bITDevKit, along with a variety of sample applications located in the ./examples folder within the solution. These samples serve as practical demonstrations of how to leverage the capabilities of the bITDevKit in real-world scenarios. All components are available as nuget packages.

For the latest updates and release notes, please refer to the RELEASES.

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Result.cs Overview

The Result class encapsulates the outcome of an operation, promoting an expressive and error-tolerant way to handle success and failure states.

The Result class is a central component designed to encapsulate the outcome of an operation, providing a way to represent both successful and failed operations. This class promotes a more expressive and error-tolerant approach to handling operation results, encouraging the explicit declaration of success or failure states.

Returning a Result

To return a Result from a method, you typically define the method to return Result or Result<T>, where T is the type of the value returned in case of success. Here is an example method returning a Result:

public Result PerformOperation()
{
    // Your logic here
    
    if (success)
    {
        return Result.Success();
    }
    else
    {
        return Result.Failure(new Error("Operation Failed"));
    }
}

Handling a Result

When you receive a Result from a method, you can handle it by checking its success or failure state. Here's an example:

var result = PerformOperation();

if (result.IsSuccess)
{
    // Handle success
}
else
{
    // Handle failure
    var error = result.Error;
    Console.WriteLine(error.Message);
}

Using Typed Results

Sometimes, you may want to return a result with a value. This is where Result<T> comes in handy:

public Result<int> CalculateSum(int a, int b)
{
    if (a < 0 || b < 0)
    {
        return Result.Failure<int>(new Error("Inputs must be non-negative"));
    }

    return Result.Success(a + b);
}

Handling a Result<T> involves extracting the value if the operation was successful:

var result = CalculateSum(5, 10);

if (result.IsSuccess)
{
    int sum = result.Value;
    Console.WriteLine($"Sum: {sum}");
}
else
{
    Console.WriteLine(result.Error.Message);
}

Typed Errors

Typed errors provide a more specific and structured way to handle different error scenarios. For example, the EntityNotFoundResultError class can be used to represent an error where an entity is not found:

EntityNotFoundResultError.cs:

public class EntityNotFoundResultError : Error
{
    public EntityNotFoundResultError(string entityName, object key)
        : base($"Entity '{entityName}' with key '{key}' was not found.")
    {
    }
}

You can return this typed error as follows:

public Result GetEntity(int id)
{
    var entity = repository.FindById(id);

    if (entity == null)
    {
        return Result.Failure(new EntityNotFoundResultError("EntityName", id));
    }

    return Result.Success(entity);
}

When handling the result, you can check if the error is of a specific type:

var result = GetEntity(1);

if (result.IsSuccess)
{
    // Handle success
}
else if (result.Error is EntityNotFoundResultError)
{
    var error = (EntityNotFoundResultError)result.Error;
    Console.WriteLine(error.Message);
}
else
{
    // Handle other errors
}

Other available typed errors are:

By using typed errors, you can create more expressive and manageable error handling in your application.