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IWMSCacheItemCollection.GetCount (C#)

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IWMSCacheItemCollection.GetCount (C#)

The GetCount method retrieves the number of IWMSCacheItemDescriptor objects in the collection.

Syntax

  void

Parameters

plNumCacheItemDescriptors

[out] int containing the number of cache descriptors.

Return Values

This method does not return a value. To report an error, the plug-in can throw a COMException object to the server. If the plug-in uses the IWMSEventLog object to log error information, it is recommended that it throw NS_E_PLUGIN_ERROR_REPORTED (0xC00D157D). Typically, the server attempts to make plug-in error information available to the server object model, the Windows Event Viewer, and the troubleshooting list in the details pane of the Windows Media Services MMC. However, if the plug-in uses the IWMSEventLog object to send custom error information to the Windows Event Viewer, throwing NS_E_PLUGIN_ERROR_REPORTED stops the server from also logging to the event viewer. For more information about plug-in error information, see Identifying Plug-in Errors.

Remarks

The IWMSCacheItemDescriptor object retrieves the size, version number, expiration date, and URL of cached content.

Example Code

The following example assumes that the cache plug-in makes use of the .NET DataSet collection of DataTable objects. Each DataRow object in the data table represents one IWMSCacheDescriptor object.

using System.Data;
using Microsoft.WindowsMediaServices.Interop;
using System.Runtime.InteropServices;

void IWMSCacheItemCollection.GetCount(out int count)
{

  // Retrieve the count of entries in the DataTable object.
  try
  {
    // DT is a DataTable object.
    DataRow[] rows = DT.Select();
    count = rows.Length;
  }
  catch(Exception e)
  {
    count = 0;
    throw new COMException();
  }
}

Requirements

Reference: Add a reference to Microsoft.WindowsMediaServices.

Namespace: Microsoft.WindowsMediaServices.Interop.

Assembly: Microsoft.WindowsMediaServices.dll.

Library: WMSServerTypeLib.dll.

Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; Windows Server 2008.

See Also

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