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- using System;
- using System.Collections.Generic;
- namespace Works.Collections.Extensions
- {
- /// <summary>
- /// Extension methods for Collections.
- /// </summary>
- public static class CollectionExtensions
- {
- /// <summary>
- /// Checks whatever given collection object is null or has no item.
- /// </summary>
- public static bool IsNullOrEmpty<T>(this ICollection<T> source)
- {
- return source == null || source.Count <= 0;
- }
- /// <summary>
- /// Adds an item to the collection if it's not already in the collection.
- /// </summary>
- /// <param name="source">Collection</param>
- /// <param name="item">Item to check and add</param>
- /// <typeparam name="T">Type of the items in the collection</typeparam>
- /// <returns>Returns True if added, returns False if not.</returns>
- public static bool AddIfNotContains<T>(this ICollection<T> source, T item)
- {
- if (source == null)
- {
- throw new ArgumentNullException("source");
- }
- if (source.Contains(item))
- {
- return false;
- }
- source.Add(item);
- return true;
- }
- }
- }
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