示例#1
0
 /// <summary>
 /// Converts the given comparison function to a comparer object.
 /// </summary>
 /// <typeparam name="T">The type of the items that are compared.</typeparam>
 /// <param name="comparison">The comparison function to convert.</param>
 /// <returns>A new comparer that wraps the comparison function.</returns>
 /// <exception cref="System.ArgumentNullException">The comparison function is null.</exception>
 public static IComparer <T> ToComparer <T>(this Func <T, T, int> comparison)
 {
     if (comparison == null)
     {
         throw new ArgumentNullException("comparison");
     }
     return(ComparisonWrapper <T> .GetComparer(comparison));
 }
示例#2
0
        /// <summary>
        /// Creates a new KeyComparer that sorts using the results of the key selector.
        /// </summary>
        /// <typeparam name="TKey">The type of the key.</typeparam>
        /// <param name="keySelector">A function that selects a key.</param>
        /// <param name="keyComparison">The comparison delegate to use to compare keys.</param>
        /// <returns>A KeyComparer using the key selector.</returns>
        /// <exception cref="System.ArgumentNullException">The key selector is null.</exception>
        /// <exception cref="System.ArgumentNullException">The key comparison delegate is null.</exception>
        public static KeyComparer <T> OrderBy <TKey>(Func <T, TKey> keySelector, Func <TKey, TKey, int> keyComparison)
        {
            if (keySelector == null)
            {
                throw new ArgumentNullException("keySelector");
            }
            if (keyComparison == null)
            {
                throw new ArgumentNullException("keyComparison");
            }
            IComparer <TKey> keyComparer = ComparisonWrapper <TKey> .GetComparer(keyComparison);

            return(new TypedKeyComparer <T, TKey>(keySelector, keyComparer));
        }
示例#3
0
        /// <summary>
        /// Composes a comparer that performs subsequent ordering using the comparison.
        /// </summary>
        /// <typeparam name="T">The type being compared.</typeparam>
        /// <param name="baseComparer">The comparer to extend.</param>
        /// <param name="comparison">The comparison to use if two items compare as equal using the base comparer.</param>
        /// <returns>A comparer that performs comparisons using both comparison operations.</returns>
        /// <exception cref="System.ArgumentNullException">The base comparer is null.</exception>
        /// <exception cref="System.ArgumentNullException">The comparison delegate is null.</exception>
        public static IComparer <T> ThenBy <T>(this IComparer <T> baseComparer, Func <T, T, int> comparison)
        {
            if (baseComparer == null)
            {
                throw new ArgumentNullException("baseComparer");
            }
            if (comparison == null)
            {
                throw new ArgumentNullException("comparison");
            }
            IComparer <T> wrapper = ComparisonWrapper <T> .GetComparer(comparison);

            IComparer <T> compoundComparer = CompoundComparer <T> .GetComparer(baseComparer, wrapper);

            return(compoundComparer);
        }