SqlMethods.cs. NH-3437 Allow using SqlMethods.Like() as an extension method.

Author: oskarb

src/NHibernate/Linq/SqlMethods.cs

@@ -6,10 +6,12 @@ public static class SqlMethods
 	{
 		/// <summary>
 		/// Use the SqlMethods.Like() method in a Linq2NHibernate expression to generate
-		/// an SQL LIKE expression. (Any 2-argument method named Like in a class named SqlMethods
-		/// will be translated.)
+		/// an SQL LIKE expression. (If you want to avoid depending on the NHibernate.Linq namespace,
+		/// you can define your own replica of this method. Any 2-argument method named Like in a class named SqlMethods
+		/// will be translated.) This method can only be used in Linq2NHibernate expression, and will throw
+		/// if called directly.
 		/// </summary>
-		public static bool Like(string matchExpression, string pattern)
+		public static bool Like(this string matchExpression, string sqlLikePattern)
 		{
 			throw new NotSupportedException(
 				"The NHibernate.Linq.SqlMethods.Like(string, string) method can only be used in Linq2NHibernate expressions.");