Odata v4 error "Does not support untyped value in non-open type"

Question

As I updated the model, it throws "Does not support untyped value in non-open type". It was working before the update. Unable to pin down the source of the problem. any ideas.

Answer 1

I've experienced this error before and it's caused by passing a property of a JSON object that doesn't exist on the data model.

For example, given the data model:

public class User
{
    public long UserId { get; set; }

    public string UserName { get; set; }
}

And an OData controller has the method:

public IHttpActionResult Post(User user)

When the following data is sent using the POST method:

{
    "UserId": "0",
    "UserName": "test",
    "UserPassword": "test"
}

Then the server will return error 400 with the following response:

{
    "error": {
        "code": "",
        "message": "The request is invalid.",
        "innererror": {
            "message": "user : Does not support untyped value in non-open type.\r\n",
            "type": "",
            "stacktrace": ""
        }
    }
}

So if the UserPassword property, in this example, is removed from the data sent using the POST method, then the error doesn't occur.