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    <p>Well, after a while i've made extension methods for accessing my cache: </p> <pre><code>public static class MyExtensions { // temlplate for cache item key name private const string CacheKeyTemplate = "{0}_{1}"; private static string GetCachePrefixByType(Type type) { // this is just sample, implement it any way you want switch (type.Name) { case "Blog": return "b"; break; case "BlogPost": return "bp"; break; case "Comment": return "c"; break; default: throw new NotImplementedException(); } } // insert with key containing object type custom prefix and object id public static void Put(this Cache cache, object obj, long id) { cache.Insert(String.Format(CacheKeyTemplate, GetCachePrefixByType(obj.GetType()), id), obj); } // get by object type and id public static T Get&lt;T&gt;(this Cache cache, long id) { return (T)cache[String.Format(CacheKeyTemplate, GetCachePrefixByType(typeof(T)), id)]; } // get objects by WHERE expression public static List&lt;object&gt; Get(this Cache cache, Func&lt;object, bool&gt; f) { return cache.Cast&lt;DictionaryEntry&gt;().Select(e =&gt; e.Value).Where(f).ToList(); } // remove by object type and id public static void Remove&lt;T&gt;(this Cache cache, long id) { cache.Remove(String.Format(CacheKeyTemplate, GetCachePrefixByType(typeof(T)), id)); } // remove cache items by WHERE expression against stored objects public static void Remove(this Cache cache, Func&lt;object, bool&gt; f) { foreach (string key in cache.Cast&lt;DictionaryEntry&gt;().Where(de =&gt; f.Invoke(de.Value)).Select(de =&gt; de.Key)) { cache.Remove(key); } } } </code></pre> <p>and this is my classes to test:</p> <pre><code>private class Blog { public int BlogId { get; set; } public string Name { get; set; } } private class BlogPost { public int PostId { get; set; } public int BlogId { get; set; } public string Text { get; set; } } private class Comment { public int PostId { get; set; } public int CommentId { get; set; } public string Text { get; set; } } </code></pre> <p>and the test code itself:</p> <pre><code> // a blog Blog blog = new Blog{ BlogId = 1, Name = "Jim" }; // two blog posts BlogPost post1 = new BlogPost { PostId = 1, BlogId = 1, Text = "Aaaaaaaa" }; BlogPost post2 = new BlogPost { PostId = 2, BlogId = 1, Text = "Bbbbbbbbbb" }; // two comments to the 1st blog post Comment comment11 = new Comment { CommentId = 11, PostId = 1, Text = "qwerty" }; Comment comment12 = new Comment { CommentId = 12, PostId = 1, Text = "asdfg" }; // one comment to the 2nd blog post Comment comment21 = new Comment { CommentId = 21, PostId = 2, Text = "zxcvbn" }; // put it all to cache HttpRuntime.Cache.Put(blog, blog.BlogId); HttpRuntime.Cache.Put(post1, post1.PostId); HttpRuntime.Cache.Put(post2, post2.PostId); HttpRuntime.Cache.Put(comment11, comment11.CommentId); HttpRuntime.Cache.Put(comment12, comment12.CommentId); HttpRuntime.Cache.Put(comment21, comment21.CommentId); // get post #2 by its id BlogPost testPost = HttpRuntime.Cache.Get&lt;BlogPost&gt;(2); // testPost.Text = "Bbbbbbbbbb" // get all comments for post #1 IEnumerable&lt;Comment&gt; testComments = HttpRuntime.Cache.Get( x =&gt; (x is Comment) &amp;&amp; ((Comment)x).PostId == 1).Cast&lt;Comment&gt;(); // comments 11 and 12 are in the list // remove comment 21 HttpRuntime.Cache.Remove&lt;Comment&gt;(21); // test if it was removed comment21 = HttpRuntime.Cache.Get&lt;Comment&gt;(21); // null // remove anything having text property = "qwerty" HttpRuntime.Cache.Remove(x =&gt; x.GetType().GetProperty("Text") != null &amp;&amp; ((dynamic)x).Text == "qwerty"); // test if comment 11 it was removed comment11 = HttpRuntime.Cache.Get&lt;Comment&gt;(11); // null // but comment 12 should still exist comment12 = HttpRuntime.Cache.Get&lt;Comment&gt;(12); // it's there // remove anything from cache HttpRuntime.Cache.Remove(x =&gt; true); // cache items count should be zero int count = HttpRuntime.Cache.Count; // it is! </code></pre>
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