using CSharpFunctionalExtensions;

using System;

​

static void Main(string[] args)

{

    var result = ProcessData("valid input").Bind(ValidateData).Bind(SaveData);

    result.Match(

        success => Console.WriteLine($"Success: {success}"), 

        error => Console.WriteLine($"Error: {error}")); // <<--- here you can handle

}

​

static Result<string, ApplicationError> ProcessData(string input)

{

    if (string.IsNullOrEmpty(input))

    {

        return Result.Failure<string, ApplicationError>(new ApplicationError("Input cannot be empty"));

    }

​

    return Result.Success<string, ApplicationError>(input.ToUpper());

}

​

static Result<string, ApplicationError> ValidateData(string data)

{

    if (data.Length < 5)

    {

        return Result.Failure<string, ApplicationError>(new ApplicationError("Data is too short"));

    }

​

    return Result.Success<string, ApplicationError>(data);

}

​

static Result<string, ApplicationError> SaveData(string data)

{

    bool isSaved = true; // simulate save operation

    if (!isSaved)

    {

        return Result.Failure<string, ApplicationError>(new ApplicationError("Failed to save data"));

    }

​

    return Result.Success<string, ApplicationError>("Data saved successfully");

}

​

public class ApplicationError

{

    public string Message { get; }

​

    public ApplicationError(string message)

    {

        Message = message;

    }

​

    public override string ToString() => Message;

}