has
Returns true if there is a value set with the given key, otherwise false.
Return
true if there is a value set with the given key, otherwise false
Parameters
key
the key, cannot be null
Type Parameters
T
the value's type
Returns true if there is a value set with the given key, otherwise false.
true if there is a value set with the given key, otherwise false
the key, cannot be null
the value's type