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Linq: Loop extension
using System;
using System.Collections.Generic;
using System.Text;

namespace System.Linq
{
    public static class GenericEachExtension
    {
        public static IEnumerable<T> Each<T>(this IEnumerable<T> source, Action<T> action)
        {
            foreach (T t in source)
            {
                action.Invoke(t);
            }
            return source;
        }

        public static IEnumerable<T> Each<T>(this IEnumerable<T> source, Func<T, bool> action)
        {
            foreach (T t in source)
            {
                if (!action.Invoke(t)) break;
            }
            return source;
        }

        public static IEnumerable<T> Each<T>(this IEnumerable<T> source, Action<T, int> action)
        {
            int i = 0;
            foreach (T t in source)
            {
                action.Invoke(t, i);
                i++;
            }
            return source;
        }

        public static IEnumerable<T> Each<T>(this IEnumerable<T> source, Func<T, int, bool> action)
        {
            int i = 0;
            foreach (T t in source)
            {
                if (!action.Invoke(t, i)) break;
                i++;
            }
            return source;
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace System.Collections
{
    public static class EachExtension
    {
        public static IEnumerable Each<T>(this IEnumerable source, Action<T> action)
        {
            foreach (T t in source)
            {
                action.Invoke(t);
            }
            return source;
        }

        public static IEnumerable Each<T>(this IEnumerable source, Func<T, bool> action)
        {
            foreach (T t in source)
            {
                if (!action.Invoke(t)) break;
            }
            return source;
        }

        public static IEnumerable Each<T>(this IEnumerable source, Action<T, int> action)
        {
            int i = 0;
            foreach (T t in source)
            {
                action.Invoke(t, i);
                i++;
            }
            return source;
        }

        public static IEnumerable Each<T>(this IEnumerable source, Func<T, int, bool> action)
        {
            int i = 0;
            foreach (T t in source)
            {
                if (!action.Invoke(t, i)) break;
                i++;
            }
            return source;
        }

        public static IEnumerable Each(this IEnumerable source, Action<object> action)
        {
            foreach (object t in source)
            {
                action.Invoke(t);
            }
            return source;
        }

        public static IEnumerable Each(this IEnumerable source, Func<object, bool> action)
        {
            foreach (object t in source)
            {
                if (!action.Invoke(t)) break;
            }
            return source;
        }

        public static IEnumerable Each(this IEnumerable source, Action<object, int> action)
        {
            int i = 0;
            foreach (object t in source)
            {
                action.Invoke(t, i);
                i++;
            }
            return source;
        }

        public static IEnumerable Each(this IEnumerable source, Func<object, int, bool> action)
        {
            int i = 0;
            foreach (object t in source)
            {
                if (!action.Invoke(t, i)) break;
                i++;
            }
            return source;
        }
    }
}