How to Resolve the 'Self Referencing Loop Detected' Exception When Serializing a List of Objects with JSON.Net?

"Self Referencing Loop Detected" Exception with JSON.Net

When Serializing a List of Objects, JSON.Net can encounter a "Self Referencing Loop Detected" exception. This error occurs when there are circular references within the serialized object graph.

Specific Problem

The provided code snippet:

public ActionResult getRouteFromPart(int partId)
{
    List<Route> routes = _routeService.GetRouteByPartType(partId);
    ...
    return this.AdvancedJsonResult(new
    {
        Routes = routes
    }, JsonRequestBehavior.AllowGet);
}

throws the exception while attempting to serialize the list of Route objects.

Solution

The exception indicates that there is a circular reference within the Route object graph. Specifically, the error message mentions a path of 'routes[0].incomingLots[0].partNumber.partType.partNumbers'. This suggests that there is a relationship between Route objects and PartNumber objects, and that the reference is causing a loop.

To resolve this issue, you can disable self-referencing loops during serialization by configuring the JSON.Net serializer settings as follows:

var settings = new JsonSerializerSettings
{
    ReferenceLoopHandling = ReferenceLoopHandling.Ignore
};

This setting instructs JSON.Net to ignore circular references and continue the serialization process.

Full Exception Message

Self referencing loop detected with type 'System.Data.Entity.DynamicProxies.PartNumber_B135A5D16403B760C3591872ED4C98A25643FD10B51246A690C2F2D977973452'. Path 'routes[0].incomingLots[0].partNumber.partType.partNumbers'.

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