Represents a set of properties; every property is a key/value pair where the key is a string and the value is an object.
The IPropertyCollection type exposes the following members.
|ContainsKey||Determines if the IPropertyCollection contains an element with the specified key.|
|GetEnumerator||(Inherited from IEnumerable.)|
|IsSupported||Verifies if a given type is supported to serve as the type of object stored in the IPropertyCollection.|
|TryGetValue||Determines if there is an object in the collection that matches the key and the value.|