Returns true if there are no more than a set number of items in the IEnumerable : IEnumerable « Collections Data Structure « C# / C Sharp






  1. C# / C Sharp
  2. Collections Data Structure
  3. IEnumerable

Returns true if there are no more than a set number of items in the IEnumerable

  

using System.Linq;
using System.Diagnostics;
namespace System.Collections.Generic
{
    public static class EnumeratorExtensions
    {


        /// <summary>
        /// Returns true if there are no more than a set number of items in the IEnumerable&lt;T&gt;.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">The source list of items.</param>
        /// <param name="number">The number of items that must exist.</param>
        /// <returns>True if there are no more than the number of items, false otherwise.</returns>
        public static bool AtMost<T>(this IEnumerable<T> source, int number)
        {
            if (source == null)
                throw new ArgumentNullException("source");

            bool result;
            int count = 0;
            using (IEnumerator<T> data = source.GetEnumerator())
            {
                while (count < number && data.MoveNext())
                {
                    count++;
                }
                result = !data.MoveNext();
            }
            return result;
        }

        /// <summary>
        /// Returns true if there are no more than a set number of items in the IEnumerable&lt;T&gt; that satisfy a given condition.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">The source list of items.</param>
        /// <param name="number">The number of items that must exist.</param>
        /// <param name="predicate">The condition to apply to the items.</param>
        /// <returns>True if there are no more than the number of items, false otherwise.</returns>
        public static bool AtMost<T>(this IEnumerable<T> source, int number, Func<T, bool> condition)
        {
            if (source == null)
                throw new ArgumentNullException("source");
            if (condition == null)
                throw new ArgumentNullException("condition");

            bool result;
            int count = 0;
            using (IEnumerator<T> data = source.GetEnumerator())
            {
                while (count < number && data.MoveNext())
                {
                    if (condition(data.Current))
                        count++;
                }
                result = !data.MoveNext();
            }
            return result;
        }
    }
}








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