/// <summary>
/// GetUnion 高效地求两个List元素的并集。
/// </summary>
public static List <T> GetUnion <T>(IList <T> list1, IList <T> list2)
{
SortedDictionary <T, int> result = new SortedDictionary <T, int>();
foreach (T tmp in list1)
{
if (!result.ContainsKey(tmp))
{
result.Add(tmp, 0);
}
}
foreach (T tmp in list2)
{
if (!result.ContainsKey(tmp))
{
result.Add(tmp, 0);
}
}
return((List <T>)CollectionConverter.CopyAllToList <T>(result.Keys));
}
/// <summary>
/// ConvertAll 将source中的每个元素转换为TResult类型
/// </summary>
public static IList <TResult> ConvertAll <TObject, TResult>(IEnumerable <TObject> source, Func <TObject, TResult> converter)
{
return(CollectionConverter.ConvertSpecification <TObject, TResult>(source, converter, null));
}