using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {       

        IEnumerable<MyClass> myClassItems = new List<MyClass>() {new MyClass("1"), new MyClass("2"), new MyClass("InvalidValue"), new MyClass("3")};

        foreach (int integer in myClassItems.SelectTry<MyClass, string, int>(x => x.MyIntegerAsString, int.TryParse))

        {

            Console.WriteLine(integer);

        }

    }

}

​

public static class LinqUtilities

{

    public delegate bool TryFunc<in TSource, TResult>(TSource arg, out TResult result);

    public static IEnumerable<TResult> SelectTry<TSource, TValue, TResult>(this IEnumerable<TSource> source, Func<TSource, TValue> selector, TryFunc<TValue, TResult> executor)

    {

        foreach (TSource s in source)

        {

            TResult r;

            if (executor(selector(s), out r))

                yield return r;

        }

    }

}

​

public class MyClass

{

    public MyClass(string integerAsString)

    {

        this.MyIntegerAsString = integerAsString;

    }

​

    public string MyIntegerAsString

    {

        get;

        set;

    }

}