AggregateCacheDependency.GetUniqueID Method

Definition

Namespace:

System.Web.Caching

Assembly:

System.Web.dll

Retrieves a unique identifier for the AggregateCacheDependency object.

public:
 override System::String ^ GetUniqueID();

public override string GetUniqueID ();

override this.GetUniqueID : unit -> string

Public Overrides Function GetUniqueID () As String

Returns

String

The unique identifier for the AggregateCacheDependency object. If one of the associated dependency objects does not have a unique identifier, the GetUniqueID() method returns null.

Examples

The following code example uses the GetUniqueID method to create and display an identifier for an instance of the AggregateCacheDependency class, named aggDep, once it is created and populated.

         ' Create two CacheDependency objects, one to a
         ' text file and the other to an XML file. 
         ' Create a CacheDependency array with these 
         ' two objects as items in the array.
          txtDep = New CacheDependency(Server.MapPath("Storage.txt"))
          xmlDep = New CacheDependency(Server.MapPath("authors.xml"))
          Dim DepArray() As CacheDependency = {txtDep, xmlDep}

          ' Create an AggregateCacheDependency object and 
          ' use the Add method to add the array to it.   
          aggDep = New AggregateCacheDependency()
          aggDep.Add(DepArray)

          ' Call the GetUniqueId method to generate
          ' an ID for each dependency in the array.
          msg1.Text = aggDep.GetUniqueId()
          
          ' Add the new data set to the cache with 
          ' dependencies on both files in the array.
          Cache.Insert("XMLDataSet", Source, aggDep)

Remarks

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.