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AggregateCacheDependency::GetUniqueID Method

Retrieves a unique identifier for the AggregateCacheDependency object.

Namespace:  System.Web.Caching
Assembly:  System.Web (in System.Web.dll)

public:
virtual String^ GetUniqueID() override

Return Value

Type: System::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 nullptr.

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.

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)

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0
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