Adds the missing items to the collection. Deals with null collections - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:ICollection

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Description

Adds the missing items to the collection. Deals with null collections

Demo Code


using System.Linq;
using System.Collections.Generic;
using System;//  w  w  w  .ja  v a 2  s.c o m

public class Main{
        /// <summary>
        /// Adds the missing items to the collection.
        /// Deals with null collections
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">The source.</param>
        /// <param name="items">The items.</param>
        /// <param name="validationFunc">The validation function.</param>
        /// <remarks>
        /// The missing item is only added if the validation func returns true
        /// </remarks>
        public static void SafeAddMissing<T>(this ICollection<T> source, IEnumerable<T> items, Func<T, bool> validationFunc)
        {
            if (source == null || items == null || validationFunc == null)
                return;

            try
            {
                if (items != null && items.Count() > 0)
                {
                    foreach (T item in items)
                    {
                        if (!source.Contains(item) && validationFunc.Invoke(item))
                            source.Add(item);
                    }
                }
            }
            catch (Exception)
            {
                //TODO: Log this error
            }
        }
        /// <summary>
        /// Adds the missing items to the collection.
        /// Deals with null collections
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">The source.</param>
        /// <param name="items">The items.</param>
        public static void SafeAddMissing<T>(this ICollection<T> source, IEnumerable<T> items)
        {
            SafeAddMissing<T>(source, items, new Func<T, bool>(ShouldAddItem));
        }
}

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