/// <summary>
/// Creates dictionary instance from KeyValuePair entries.
/// </summary>
/// <typeparam name="T">Type of key</typeparam>
/// <typeparam name="TV">Type of value</typeparam>
/// <param name="entries">entries</param>
/// <returns>dictionary</returns>
public static IDictionary <T, TV> CreateFromEntries <T, TV>(params KeyValuePair <T, TV>[] entries)
{
var dictionary = new Dictionary <T, TV>(entries.Length);
dictionary.PutAll(entries);
return(ComparableDictionary <T, TV> .Of(dictionary));
}
/// <summary>
/// Maps collection items to number of occurrences.
/// </summary>
/// <typeparam name="T">Type of collection item</typeparam>
/// <param name="source">this</param>
/// <returns>Dictionary (item, itemCount)</returns>
public static IDictionary <T, int> DistinctElementCount <T>(this IEnumerable <T> source)
{
Preconditions.IsNotNull(source, () => new ArgumentNullException("source"));
var result = new Dictionary <T, int>();
foreach (var element in source)
{
if (result.ContainsKey(element))
{
result[element] = result[element] + 1;
}
else
{
result[element] = 1;
}
}
return(ComparableDictionary <T, int> .Of(result));
}
/// <summary>
/// Converts dictionary into comparable dictionary with equals/hashCode/toString implementations.
/// </summary>
/// <typeparam name="TKey">Type of dictionary key</typeparam>
/// <typeparam name="TValue">Type of dictionary value</typeparam>
/// <param name="source">this</param>
/// <returns>Comparable dictionary</returns>
public static IDictionary <TKey, TValue> ToComparable <TKey, TValue>(this IDictionary <TKey, TValue> source)
{
Preconditions.IsNotNull(source, () => new ArgumentNullException("source"));
return(ComparableDictionary <TKey, TValue> .Of(source));
}