Retrieves a unique identifier for the System.Web.Caching.AggregateCacheDependency object.
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The unique identifier for the System.Web.Caching.AggregateCacheDependency object. If one of the associated dependency objects does not have a unique identifier, the AggregateCacheDependency.GetUniqueId method returns null.
This method assigns a unique identifier to each dependency in the array and returns each of them. The identifier is a combination of either the file name (for a file dependency) or the key name (for a cache-key dependency) and a string that this method assigns to the dependency.