Fixed issue with incorrect generated ParamReader then it has indexing properties declared.

Dapper/SqlMapper.cs

@@ -1453,7 +1453,7 @@ private static IEnumerable<PropertyInfo> FilterParameters(IEnumerable<PropertyIn
             il.Emit(OpCodes.Ldarg_0); // stack is now [command]
             il.EmitCall(OpCodes.Callvirt, typeof(IDbCommand).GetProperty("Parameters").GetGetMethod(), null); // stack is now [parameters]
 
-            IEnumerable<PropertyInfo> props = type.GetProperties().OrderBy(p => p.Name);
+            IEnumerable<PropertyInfo> props = type.GetProperties().Where(p => p.GetIndexParameters().Length == 0).OrderBy(p => p.Name);
             if (filterParams)
             {
                 props = FilterParameters(props, identity.sql);

Tests/Tests.cs

@@ -1916,6 +1916,27 @@ public void TestWrongTypes_WithWrongTypes()
             item.D.Equals(true);
         }
 
+        public class ParameterWithIndexer
+        {
+            public int A { get; set; }
+            public virtual string this[string columnName]
+            {
+                get { return null; }
+                set { }
+            }
+        }
+
+        public void TestParameterWithIndexer()
+        {
+            connection.Execute(@"create proc #TestProcWithIndexer 
+	@A int
+as 
+begin
+	select @A
+end");
+            var item = connection.Query<int>("#TestProcWithIndexer", new ParameterWithIndexer(), commandType: CommandType.StoredProcedure).Single();
+        }
+
         class TransactedConnection : IDbConnection
         {
             IDbConnection _conn;