Why is EF returning a proxy class instead of the actual entity?

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You can set ObjectContext.ContextOptions.ProxyCreationEnabled to false. This will prevent you from using some of EFs fancy features like lazy loading and I believe change tracking.

As far as your app cares, it should be able to treat the proxies just like the types they represent. Is there a specific issue you are having?

Edit

We have some code that requires the POCO type instead of the proxy type and we do the following to detect if the current type is a proxy.

if (entityType.BaseType != null && entityType.Namespace == "System.Data.Entity.DynamicProxies")
{
    entityType = entityType.BaseType;
}

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