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Error serializing value system data entity dynamicproxies

instead of { System. The problem is that your are actually serializing an entity framework generated proxy object. An alternative solution, if only some values from objects are necessary, is build an anonymous class and return it, like the example below:. When i disable proxy creation then i can' t get the values of the parent, which i need it. up vote 79 down vote accepted. When you see an object like: System. Entity Framework has created this object because it tracks when the objects has changed so when you call. The downfall of this is that you aren' t actually using the specific object you defined, thus Data Contracts and Frameworks ( Json. will solve your problem. Product ( Error with this class). Should add [ DataContract] attribute on class and [ DataMember] on fields like that using System. Serialization; [ DataContract] public class Account { [ DataMember]. Your problem is that the dynamic proxies the EF runtime creates for you are usually not. The problem arises when Entity Framework wants to track changes in your object which is not built into POCO objects.

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  • Video:Serializing system dynamicproxies

    Value entity data

    But selecting data that' s stored in a normalized database ( and in my case including a version history) to be serialized is a nightmare. In short: It means that it holds the original values and updated values so they can be updated later. ExceptionMessage" : " Error getting value from ' tbl_ Tournament' on ' System. It is because you have lazy loading enabled and you are serializing the object graph after you dispose of the DbContext instance. So what is happening. You create a DbContext; You retrieve the data from the DbContext for that one type; You pass the data to the Result method. Mainly what' s happening is that your JsonConvert is trying to serialize an object like this System. Location_ 5E43C6C196972BF0754973E48C9C941092D86818CD94005E9A759B70BF6E48E6. Well in order to transfer the data into the new object you must call the Get method on all properties within the old entity, thus triggering lazy loading. For this you can use 3rd party packages such as AutoMapper but they can. If you want to serialize entities you can disable proxy creation before retrieving that object. You also need to eager load navigational properties if you want to serialize them as well.

    To disable proxy creation in EF 4.