CentralizedControl/HandyControl/HandyControl_Shared/Tools/Extension/EnumerableExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace HandyControl.Tools.Extension;

public static class EnumerableExtension
{
    public static IEnumerable<TSource> Do<TSource>(this IEnumerable<TSource> source, Action<TSource> predicate)
    {
        var enumerable = source as IList<TSource> ?? source.ToList();
        foreach (var item in enumerable)
        {
            predicate.Invoke(item);
        }

        return enumerable;
    }

    public static IEnumerable<TSource> DoWithIndex<TSource>(this IEnumerable<TSource> source, Action<TSource, int> predicate)
    {
        var enumerable = source as IList<TSource> ?? source.ToList();
        for (var i = 0; i < enumerable.Count; i++)
        {
            predicate.Invoke(enumerable[i], i);
        }

        return enumerable;
    }
}