Lookup<TKey, TElement>.SingleOrDefault Method
Returns a single, specific element of a sequence of values, or a default value if no such element is found.
This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.
|SingleOrDefault()||Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. (Defined by Enumerable.)|
|SingleOrDefault(Func<IGrouping<TKey, TElement>, Boolean>)||Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition. (Defined by Enumerable.)|