support for empty lists

Dapper/SqlMapper.cs

@@ -375,11 +375,18 @@ public static void PackListParameters(IDbCommand command, string namePrefix, obj
                     command.Parameters.Add(listParam);
                 }
 
+                if (count == 0)
+                {
+                    command.CommandText = command.CommandText.Replace(namePrefix, "(SELECT NULL WHERE 1 = 0)");
+                }
+                else
+                {
                     command.CommandText = command.CommandText.Replace(namePrefix,
                         "(" + string.Join(
                             ",", Enumerable.Range(1, count).Select(i => namePrefix + i.ToString())
                         ) + ")");
                 }
+            }
 
         }
         private static Action<IDbCommand, object> CreateParamInfoGenerator(Type type)

Tests/Tests.cs

@@ -154,6 +154,9 @@ public void TestStringList()
         {
             connection.Query<string>("select * from (select 'a' as x union all select 'b' union all select 'c') as T where x in @strings", new {strings = new[] {"a","b","c"}})
                 .IsSequenceEqualTo(new[] {"a","b","c"});
+
+             connection.Query<string>("select * from (select 'a' as x union all select 'b' union all select 'c') as T where x in @strings", new { strings = new string[0] })
+	                .IsSequenceEqualTo(new string[0]);
         }
 
         public void TestExecuteCommand()