SystemExtensions/SystemExtensions.NetStandard/Extensions/Try.cs

using System.Collections.Generic;

namespace System.Extensions;

public static class Try
{
    public static Try<TResult> Action<TResult>(Func<TResult> act)
    {
        return new Try<TResult>(act);
    }
}
public class Try<TResult>
{
    private readonly Func<TResult> action;
    private readonly List<Func<Exception, TResult>> catchActions = new List<Func<Exception, TResult>>();
    internal Try(Func<TResult> action)
    {
        this.action = action;
    }
    public static Try<TResult> Action(Func<TResult> act)
    {
        return new Try<TResult>(act);
    }

    public Try<TResult> Catch<TException>(Func<TException, TResult> act) where TException : Exception
    {
        this.catchActions.Add((Func<Exception, TResult>)act);
        return this;
    }

    public TResult Run()
    {
        try
        {
            return this.action();
        }
        catch (Exception ex)
        {
            foreach (var catchAction in this.catchActions)
            {
                return catchAction(ex);
            }

            throw;
        }
    }

    public TResult Finally(Action act)
    {
        if (act is null)
        {
            throw new ArgumentNullException(nameof(act));
        }

        try
        {
            return this.action();
        }
        catch (Exception ex)
        {
            foreach (var catchAction in this.catchActions)
            {
                return catchAction(ex);
            }

            throw;
        }
        finally
        {
            act();
        }
    }
}