Dictionary property in Cosmos DB using EF - azure

Question

I have a class as below and try to use EF core framework to store the below model to Cosmos DB. But the the JSON is stored as
{
"id": "e6b75f1f-0cc2-488c-9074-62e7e85c727a",
"Type ": "testType",
"TagName ": "TagName",
"DictionaryList ": {}
}
public class TestDictionary
{
public Guid Id { get; set; }
public string Type { get; set; }
public string TagName { get; set; }
public Dictionary<string,object> DictionaryList { get; set; }
}
Problem is that the DictionaryList property doesn't save the data that is passed from api. It always stores as empty object instead of data passed through dictionary
I want my Jason to be stored in cosmos as below
{
"id": "e6b75f1f-0cc2-488c-9074-62e7e85c727a",
"Type ": "testType",
"TagName ": "TagName",
"DictionaryList ": {
“Account number”: “123456”,
“Check date”: “11/20/2020”
}
}

Answer 1

Only collections of primitive types are supported by EF Core 6, So DictionaryList needs to be typed as Dictionary<string,string>
Dictionary<string,object> is recognized as a nested entity type, you could use it, but you'd need to explicitly configure all the keys that it can contain:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<TestDictionary>()
.OwnsOne(t => t.DictionaryList, c =>
{
c.Property<string>("Type");
c.Property<string>("TagName");
});
}

Answer 2

I later realized that I could using the cosmos sdk insert Dictionary<stringm, object> without any problem, and that Ef core does expose the underlying cosmos client.
So I solved the issue by access the underlying cosmos client, and use that to insert my dictionary.
var cosmosClient = dbContext.Database.GetCosmosClient();
var container = cosmosClient.GetContainer( "db", "container");
await container.CreateItemAsync(new Dictionary<string,object>);
works like a charm.
remember the Id has to be id or atleast serializer has to be told that Id has to be interpreted id