AddIfNotNull collection extensions

May 25, 2013 · 1 min read

I want to post a few recently created collection extensions to write in one line, what otherwise takes 2 or more

     public static void AddIfNotNull( this IList coll, T newItem) where T : class

        {

            if (newItem != null)

            {

                coll.Add(newItem);

            }

        }

         public static void AddRangeIfNotNullOrEmpty( this List coll, IEnumerable newItems) where T : class

        {

            if (!newItems.IsNullOrEmptySequence())

            {

                coll.AddRange(newItems);

            }

        }

  public static void AddIfNotContains( this Dictionary dictionary,  TKey key, TValue value)

        {

            if (!dictionary.ContainsKey(key))

            {

                dictionary.Add(key, value);

            }

        }

The methods use

public static bool IsNullOrEmptySequence(this IEnumerable c)

              {

                      return (c == null || !c.Any() );

              }

I've also found a few extensions, that could be useful in https://pikacode.com/Barankin/Fabrika-dveri/file/default/CRM/Common/Extensions/LinqExtensions.cs

This article is part of the GWB Archives. Original Author: Michael Freidgeim

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