net10.0 
namespace System.Runtime.Caching
{
    [DefaultMember("Item")]
    public abstract class ObjectCache : IEnumerable, IEnumerable<KeyValuePair<string, object>>
    {
        public abstract long GetCount(string regionName = null);
    }
}
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Reference this API
.NET
8.09.010.0
.NET Framework
4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net10.0
Assembly

System.Runtime.Caching , Version=10.0.0.1, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Runtime.Caching.

Package System.Runtime.Caching (10.0.1) net10.0
Platform Restrictions

This API is supported on any platform except for these:

  • wasi
  • Built-in API
  • Package-provided API