Extra reflection helper

MarkMpn.Sql4Cds.Engine/ExpressionFunctions.cs

@@ -1404,6 +1404,23 @@ private static MethodInfo GetMethodInfo(LambdaExpression expression)
             return outermostExpression.Method;
         }
 
+        /// <summary>
+        /// Given a lambda expression that accesses a property, return the property info
+        /// </summary>
+        /// <typeparam name="T">The type of value returned by the property</typeparam>
+        /// <param name="expression">The expression</param>
+        /// <returns>The property details</returns>
+        public static PropertyInfo GetPropertyInfo<T>(Expression<Func<T>> expression)
+        {
+            var lambda = (LambdaExpression)expression;
+            var prop = lambda.Body as MemberExpression;
+
+            if (prop == null)
+                throw new ArgumentException("Invalid Expression. Expression should consist of a property access only.");
+
+            return prop.Member as PropertyInfo;
+        }
+
         /// <summary>
         /// Placeholder for a function argument when using <see cref="Call{T}(Expression{Func{T}}, Expression[])"/>
         /// </summary>