Adds or sets a value for a dictionary. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:IDictionary

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Description

Adds or sets a value for a dictionary.

Demo Code

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

public class Main{

        /// <summary>
        /// Adds or sets a value for a dictionary.
        /// </summary>
        /// <typeparam name="TKey">Type of the keys.</typeparam>
        /// <typeparam name="TValue">Type of the values.</typeparam>
        /// <param name="dict">The dictionary.</param>
        /// <param name="key">The key.</param>
        /// <param name="value">The value.</param>
        /// <returns>
        /// <see langword="true" /> if <paramref name="value" /> was added or <see langword="false" /> if it was set.
        /// <see langword="null" /> indicates that <paramref name="dict" /> is <see langword="null" />.
        /// </returns>
        public static bool? AddOrSet<TKey, TValue>(IDictionary<TKey, TValue> dict, TKey key, TValue value)
        {//  w  w  w. j a  v a  2 s.c  om
            if (dict == null)
            {
                return null;
            }

            if (!dict.ContainsKey(key))
            {
                dict.Add(key, value);
                return true;
            }

            dict[key] = value;
            return false;
        }
}

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