using System;

using Ardalis.GuardClauses;

​

public class Program

{

    // The example below will trigger exception with Guard clauses that

    // do not set ParamName of the ArgumentExceptions that they throw.

    // This seens ti be dependent on whether the custom message is set for Guard clause

    // so the sample below invokes Guard clauses with both custom message set and not set.

    public static void Main()

    {

        var parameterName = "someParameter";

        // Null.

        ExecuteExample("Null (with message)", () => Guard.Against.Null(default(object), parameterName, "SomeParameter must not be null."));

        ExecuteExample("Null (without message)", () => Guard.Against.Null(default(object), parameterName));

        // Out of Range (general).

        ExecuteExample("Out of Range (general, with message)", () => Guard.Against.OutOfRange(2, parameterName, 0, 1, "SomeParameter value must be from 0 to 1."));

        ExecuteExample("Out of Range (general, without message)",() => Guard.Against.OutOfRange(2, parameterName, 0, 1));

        // Out of Range (enum).

        ExecuteExample("Out of Range (enum v1, with message)",() => Guard.Against.OutOfRange<SomeEnum>(2, parameterName, "SomeParameter value be a valid SomeEnum value."));

        ExecuteExample("Out of Range (enum v1, without message)",() => Guard.Against.OutOfRange<SomeEnum>(2, parameterName));

        ExecuteExample("Out of Range (enum v2, with message)",() => Guard.Against.OutOfRange<SomeEnum>((SomeEnum)2, parameterName, "SomeParameter value be a valid SomeEnum value."));

        ExecuteExample("Out of Range (enum v2, without message)",() => Guard.Against.OutOfRange<SomeEnum>((SomeEnum)2, parameterName));

        // Out of Range (enumerable).

        ExecuteExample("Out of Range (enumerable, with message)", () => Guard.Against.OutOfRange(new [] {0, 1, 2}, parameterName, 0, 1, "SomeParameter value must be from 0 to 1."));

        ExecuteExample("Out of Range (enumerable, without message)", () => Guard.Against.OutOfRange(new [] {0, 1, 2}, parameterName, 0, 1));        

    }   

    private static void ExecuteExample(string title, Action clauseToEvalute)

    {

        try

        {

            clauseToEvalute();

            Console.WriteLine($"[{title}] => Guard clause did not throw.");

        }       

        catch(ArgumentException ex)

        {

            var message = GenerateMessageFromException(ex);

            Console.WriteLine($"[{title}] => {message}");

        }       

        catch(Exception ex)

        {

            var message = GenerateMessageFromException(ex);

            Console.WriteLine($"[{title}] => {message}");

        }

    }   

    private static string GenerateMessageFromException(ArgumentException ex)

    {

        return ex.ParamName is null ? "ParamName is NULL." : $"ParamName is {ex.ParamName}";

    }

    private static string GenerateMessageFromException(Exception ex)

    {

        return "Exception thrown is not an Argument Exception.";

    }

}

​

public enum SomeEnum

{

    Unknown = 0,

    Known = 1

}