SmartResults

Lightweight .NET library to use result pattern instead of throwing exceptions.

How to use it

• Result and Result<T> are structs to prevent memory allocation
• Support for JSON
  • Integrated JsonConverter for Result and Result<T>
  • Polymorphic Error objects
• Extensions for HttpResponseMessage
• Chaining flow
• Exception flow

Create and use results

Result result = Result.Ok();

if (result.IsSucceeded)
{
   Console.WriteLine("Succeeded");
}
else
{
   Console.WriteLine(result.Error);
}

Create and use results with value

Result<int> result = Result.Ok(100);

if (result.IsSucceeded)
{
   Console.WriteLine(result.Value);
}
else
{
   Console.WriteLine(result.Error);
}

Create and use failed results

Result<int> result = Result.Failed("Something is wrong!");
Result<int> result = Result.Failed(new Error(..));

if (result.IsFailed)
{
   Console.WriteLine(result.Error);
}

Use match to evaluate the result

Result<int> result = Result.Ok(100);

bool b = result.Match(value => true, error => false);

Explicit conversion

Result<string> result = Result.Ok(100).ToResult<string>(x => x.ToString());

Implicit operator for value

Result<int> result = 100;

int value = result;

Exception flow by implicit operator

int value = Create(); //throws exception if result is failed

Chaining flow

Result result1 = Create().Then(x => Console.WriteLine(x));

Result result2 = await Create().ThenAsync(async x => await Service.ExecuteAsync(x));

Result result3 = await CreateAsync().ThenAsync(x => Console.WriteLine(x));

Result result4 = await CreateAsync().ThenAsync(async x => await Service.ExecuteAsync(x));

HttpClient extensions

Result result1 = await httpClient.GetAsync("/").ReadResultFromJsonAsync();

Result<int> result2 = await httpClient.GetAsync("/").ReadResultFromJsonAsync<int>();

Supports polymorphic error objects for JSON

public class PermissionError : IError { }

Error.Register<PermissionError>();

Result result = Result.Failed(new PermissionError("Error"));

string json = JsonSerializer.Serialize(result);

Result result2 = JsonSerializer.Deserialize<Result>(json);

result2.Error //PermissionError