Friday, June 29, 2018

Asp.net WebApi OData V4 problems with nested $expands

By Hường Hana 4:30 AM , , Leave a Comment

I have a OData V4 over Asp.net WebApi (OWIN).

Everything works great, except when I try to query a 4-level $expand.

My query looks like:

http://domain/entity1($expand=entity2($expand=entity3($expand=entity4)))

I don't get any error, but the last expand isn't projected in my response.

More info:

  1. I've set the MaxExpandDepth to 10.
  2. All my Entities are EntitySets.
  3. I'm using the ODataConventionModelBuilder.
  4. I've opened an SQL-profiler and could see that the query (and the result) is correct. It's some filter that occurs after the query is executed.
  5. I've searched the web and didn't find anything suitable.
  6. I've tried different entity 4 level $expands and they didn't work as well.

Edit:

I've overridden the OnActionExecuted:

public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) {     base.OnActionExecuted(actionExecutedContext);      var objectContent = actionExecutedContext.Response.Content as ObjectContent;     var val = objectContent.Value;      var t = Type.GetType("System.Web.OData.Query.Expressions.SelectExpandWrapperConverter, System.Web.OData");     var jc = Activator.CreateInstance(t) as JsonConverter;     var jss = new JsonSerializerSettings();     jss.Converters.Add(jc);      var ser = JsonConvert.SerializeObject(val, jss);  }

The serialized value contains entity4.

I still have no idea what component removes entity4 in the pipe.

Edit #2:

I've create an adapter over DefaultODataSerializerProvider and over all the other ODataEdmTypeSerializer's. I see that during the process the $expand for entity4 exists and when the ODataResourceSerializer.CreateNavigationLink method is called on that navigationProperty (entity4) then it returns null.

I've jumped into the source code and I could see that the SerializerContext.Items doesn't include the entity4 inside it's items and the SerializerContext.NavigationSource is null.

To be specific with versions, I'm using System.Web.OData, Version=6.1.0.10907.

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