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    <p>From your <a href="https://gist.github.com/3899759" rel="nofollow noreferrer">gist</a> below I have found a easy way t flatten the properties across all base types and interfaces as demonstrated on this <a href="https://stackoverflow.com/questions/358835/getproperties-to-return-all-properties-for-an-interface-inheritance-hierarchy">post</a>.</p> <p>So I implemented the extension method for PropertyInfo that will return all properties from all interfaces and base classes inherited by the type. The problem was that IList does not have a Count property however iCollection does. The <code>public static PropertyInfo[] GetPublicProperties(this Type type)</code> will flat all properties and we get the correct one from there this should work on any property now not only Count.</p> <pre><code>public class Program { private static IList&lt;Company&gt; _companies; static void Main(string[] args) { var sort = "Employees.Count"; _companies = new List&lt;Company&gt;(); _companies.Add(new Company { Name = "c2", Address = new Address {PostalCode = "456"}, Employees = new List&lt;Employee&gt; {new Employee(), new Employee()} }); _companies.Add(new Company { Name = "c1", Address = new Address {PostalCode = "123"}, Employees = new List&lt;Employee&gt; { new Employee(), new Employee(), new Employee() } }); //display companies _companies.AsQueryable().OrderBy(sort).ToList().ForEach(c =&gt; Console.WriteLine(c.Name)); Console.ReadLine(); } } public class Company { public string Name { get; set; } public Address Address { get; set; } public IList&lt;Employee&gt; Employees { get; set; } } public class Employee{} public class Address { public string PostalCode { get; set; } } public static class OrderByString { public static IOrderedQueryable&lt;T&gt; OrderBy&lt;T&gt;(this IQueryable&lt;T&gt; source, string property) { return ApplyOrder&lt;T&gt;(source, property, "OrderBy"); } public static IOrderedQueryable&lt;T&gt; ApplyOrder&lt;T&gt;(IQueryable&lt;T&gt; source, string property, string methodName) { string[] props = property.Split('.'); Type type = typeof(T); ParameterExpression arg = Expression.Parameter(type, "x"); Expression expr = arg; foreach (string prop in props) { // use reflection (not ComponentModel) to mirror LINQ PropertyInfo pi = type.GetPublicProperties().FirstOrDefault(c =&gt; c.Name == prop); if (pi != null) { expr = Expression.Property(expr, pi); type = pi.PropertyType; } else { throw new ArgumentNullException(); } } Type delegateType = typeof(Func&lt;,&gt;).MakeGenericType(typeof(T), type); LambdaExpression lambda = Expression.Lambda(delegateType, expr, arg); object result = typeof(Queryable).GetMethods().Single( method =&gt; method.Name == methodName &amp;&amp; method.IsGenericMethodDefinition &amp;&amp; method.GetGenericArguments().Length == 2 &amp;&amp; method.GetParameters().Length == 2) .MakeGenericMethod(typeof(T), type) .Invoke(null, new object[] { source, lambda }); return (IOrderedQueryable&lt;T&gt;)result; } public static PropertyInfo[] GetPublicProperties(this Type type) { if (type.IsInterface) { var propertyInfos = new List&lt;PropertyInfo&gt;(); var considered = new List&lt;Type&gt;(); var queue = new Queue&lt;Type&gt;(); considered.Add(type); queue.Enqueue(type); while (queue.Count &gt; 0) { var subType = queue.Dequeue(); foreach (var subInterface in subType.GetInterfaces()) { if (considered.Contains(subInterface)) continue; considered.Add(subInterface); queue.Enqueue(subInterface); } var typeProperties = subType.GetProperties( BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance); var newPropertyInfos = typeProperties .Where(x =&gt; !propertyInfos.Contains(x)); propertyInfos.InsertRange(0, newPropertyInfos); } return propertyInfos.ToArray(); } return type.GetProperties(BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.Instance); } } </code></pre>
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    1. COSo How would you make this code work if I enter "Employees.Count"? https://gist.github.com/3899759
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    2. COyou just need to look into you type value and see if it is a generic type if so you need to use the generic type parameter of it on the MakegenericMethod call. But that will work only of the hard coded "Count" method.
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    3. COThat's what I did with this : https://gist.github.com/3904846 . How would you correct this code https://gist.github.com/3899759 ?
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