C#•11mo ago

❔ Losing bytes when delivering dynamic object via RabbitMQ

Hey there got a bit of a complex problem. Got this code:

public static object ToDynamicClass(this ExpandoObject expando)
{
    AssemblyName assemblyName = new AssemblyName("DynamicAssembly");
    AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
    ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicModule");
    TypeBuilder typeBuilder = moduleBuilder.DefineType("DynamicType", TypeAttributes.Public);

    foreach (var kvp in expando)
    {
        Type type = kvp.Value?.GetType() ?? typeof(object);
        FieldBuilder field = typeBuilder.DefineField("_" + kvp.Key, type, FieldAttributes.Private);
        PropertyBuilder property = typeBuilder.DefineProperty(kvp.Key, PropertyAttributes.HasDefault, type, null);

        MethodAttributes getSetAttr = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;

        MethodBuilder currGetPropMthdBldr = typeBuilder.DefineMethod("get_" + kvp.Key, getSetAttr, type, Type.EmptyTypes);
        ILGenerator currGetIL = currGetPropMthdBldr.GetILGenerator();
        currGetIL.Emit(OpCodes.Ldarg_0);
        currGetIL.Emit(OpCodes.Ldfld, field);
        currGetIL.Emit(OpCodes.Ret);

//Some code removed because of character limit

        property.SetGetMethod(currGetPropMthdBldr);
        property.SetSetMethod(currSetPropMthdBldr);
    }

    Type objType = typeBuilder.CreateType();

    object obj = Activator.CreateInstance(objType);
    foreach (var kvp in expando)
    {
        objType.GetProperty(kvp.Key)?.SetValue(obj, kvp.Value);
    }

    return obj;
}

public static object ToDynamicClass(this ExpandoObject expando)
{
    AssemblyName assemblyName = new AssemblyName("DynamicAssembly");
    AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
    ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicModule");
    TypeBuilder typeBuilder = moduleBuilder.DefineType("DynamicType", TypeAttributes.Public);

    foreach (var kvp in expando)
    {
        Type type = kvp.Value?.GetType() ?? typeof(object);
        FieldBuilder field = typeBuilder.DefineField("_" + kvp.Key, type, FieldAttributes.Private);
        PropertyBuilder property = typeBuilder.DefineProperty(kvp.Key, PropertyAttributes.HasDefault, type, null);

        MethodAttributes getSetAttr = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;

        MethodBuilder currGetPropMthdBldr = typeBuilder.DefineMethod("get_" + kvp.Key, getSetAttr, type, Type.EmptyTypes);
        ILGenerator currGetIL = currGetPropMthdBldr.GetILGenerator();
        currGetIL.Emit(OpCodes.Ldarg_0);
        currGetIL.Emit(OpCodes.Ldfld, field);
        currGetIL.Emit(OpCodes.Ret);

//Some code removed because of character limit

        property.SetGetMethod(currGetPropMthdBldr);
        property.SetSetMethod(currSetPropMthdBldr);
    }

    Type objType = typeBuilder.CreateType();

    object obj = Activator.CreateInstance(objType);
    foreach (var kvp in expando)
    {
        objType.GetProperty(kvp.Key)?.SetValue(obj, kvp.Value);
    }

    return obj;
}

Before when i tried to send the ExpandoObj itself all worked well. Now Im sending a lift of objects the above methods produces using rabbitmq. when i seralize i got a 1500 bytes messege size, when i recive the messege its only 120 bytes. Any ideas what could be wrong?

7 Replies

antimatter8189•11mo ago

In addition all the properties get lost, literally get "Dynamic Type" at the UI layer with nothing in it The data loss occurs during transit somehow

boiled goose•11mo ago

what object are you using to deserialize this

antimatter8189•11mo ago

well its a BaseDTO that contains a List<objecT> and those are located in it

 var converter = new ExpandoObjConverter;
var result = JsonConvert.DeseralizeObject<ExpandoObject>(json,converter);
rsultList.add(result)
dto.Result=resultList;
return DTO;

 var converter = new ExpandoObjConverter;
var result = JsonConvert.DeseralizeObject<ExpandoObject>(json,converter);
rsultList.add(result)
dto.Result=resultList;
return DTO;

The above code works, but if i add a line of

 result= ToDynamicClass(result)

 result= ToDynamicClass(result)

and send that list, all breaks no c# gods to help out on this?

boiled goose•11mo ago

have you tried using a dictionary instead of expando did you look at the serialized object in the rabbit ui did you try sending a message using rabbit ui to check deserialization of problematic fields

antimatter8189•11mo ago

expando uses dictionary under the hood, what u mean seralize in rabbitui? i reverted to using custom json converters, still working on it

boiled goose•11mo ago

i mean reading (and eventually sending) the message from the queue in the ui

Accord•11mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Losing bytes when delivering dynamic object via RabbitMQ