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Following code should throw exception to prevent adding duplicate collection item.
ICollection<T> collection = new List<T>();
public void Add(T item)
{
if (collection.Contain(item))
{
throw new SomeExceptionType()
}
collection.Add(item);
}
What standard exception type is the most appropriate?
Well,
Dictionary<,>.Add()throwsArgumentExceptionif such key already exists, so I guess this could be a precedent.