RustSharp 1.0.3

RustSharp

Using Rust coding style in C#.

Usage

Use the Result to handle method return values and error messages:

// Wrap a method with "Result" return value

Result<int, string> ParseInt(string str)
{
    try
    {
        return Result.Ok(int.Parse(str));
    }
    catch (Exception ex)
    {
        return Result.Err(ex.Message);
    }
}

// Call that method

string input = Console.ReadLine()!;
var result = ParseInt(input);

// Check if value is "Ok" or "Err"

var isOk = result.IsOk;
var isErr = result.IsErr;

// Match the result values

result.Match(
	(ok) => {
        Console.WriteLine($"The integer you typed is {ok}");
    },
	(err) => {
        Console.WriteLine($"The string you typed is not a integer, {err}");
    });

// You can also use switch statement

switch (result)
{
    case OkResult<int, string> ok:
        Console.WriteLine($"The integer you typed is {ok.Value}");
        break;
    case ErrResult<int, string> err:
        Console.WriteLine($"The string you typed is not a integer, {err.Value}");
        break;
}

Use Option in C#

// Write a simple method with Option return value

Option<float> Divide(float a, float b)
{
    if (b != 0.0) {
        return Option.Some(a / b);
    } else {
        return Option.None();
    }
}

// call that method

var option = Divide(114, 514);

// Check if the Option has value

var isSome = option.IsSome;
var isNone = option.IsNone;

// Match the result values

option.Match(
	(value) => {
        Console.WriteLine($"Result: {value}");
    },
	() => {
        Console.WriteLine("No value");
    });

// Or use switch statement

switch (option)
{
    case SomeOption<float> some:
        Console.WriteLine($"Result: {some.Value}");
        break;
    default:
        Console.WriteLine("No value");
        break;
}

Common methods of Result and Option

// Convert Result to Option

var result = Result<string, string>.Ok("Success value");
var option = result.Ok();   // returns Option<string> contains the success value

// Unwrap Result and Option

var result = Result<string, string>.Ok("Success value");
string value = result.Unwrap();