JSON deserialization throws circular reference ONLY in live build

问题

I have a strange issue that I can't wrap my head around. I am trying to create an "export to csv" function for my MVC4 application where the relevant JSON is passed via an ajax call to my ActionResult. The ActionResult deserializes the stringify'd JSON (with JSON.Net), writes it to a file in csv format, then returns the server path to the new file. My success callback then receives the path and calls the url to download.

This works fine locally, but on my live test server I get the following exception:

A circular reference was detected while serializing an object of type 'System.Reflection.RuntimeModule'.

The JSON (and subsequently the objects they are deserialized to) are slightly complex. They come from a grouped subset of a SlickGrid DataView. I was getting circular reference exceptions when I included the aggregate information for column totals (this is only relevant to those that are versed in SlickGrid, I do not believe the data being passed to the server is an issue), but I've removed them before passing the JSON to the server. Here is my JSON to C# class structure:

[Serializable]
public class Row
{
    public int id { get; set; }
    public DateTime DateCreated { get; set; }
    public int RefNo { get; set; }
    public string ClientName { get; set; }
    public string Plate { get; set; }
    public string Address1 { get; set; }
    public int? ProductID { get; set; }
    public string Product { get; set; }
    public string S1 { get; set; }
    public string S2 { get; set; }
}

[Serializable]
public class RootReportObject
{
    public bool __group { get; set; }
    public int level { get; set; }
    public int count { get; set; }
    public string value { get; set; }
    public string title { get; set; }
    public int collapsed { get; set; }
    public List<Row> rows { get; set; }
    public object groups { get; set; }
    public string groupingKey { get; set; }
}

The only thing that I'm thinking is that, because of the way the data is structured, the List<> of rows in the root object may be throwing the circular references during deserializtion because a group does not necessarily have unique row references.

My question is why does it work fine locally?? I have no idea what I'm missing.

回答1:

That's great that the [ScriptIgnore] attribute is helping. Also, something to be completely sure of is that all of your URL paths, including in your AJAX code, resolve correctly to the application root. When some of these are wrong, this is a notorious source of problems during the move from development to production.

It doesn't sound like it is necessarily the primary issue but I don't have any understanding of your app's design. It's definitely worth looking over.

来源：https://stackoverflow.com/questions/19935331/json-deserialization-throws-circular-reference-only-in-live-build