How to stop self-referencing loop in .Net Core Web API?
asp.net-core-webapi c# entity-framework-core
Question
I'm having some issues which I'm guessing are related to self-referencing using .NET Core Web API and Entity Framework Core. My Web API starting choking when I added .Includes for some navigation properties.
I found what appears to be a solution in the older Web API but I don't know how to implement the same thing for .NET Core Web API (I'm still in the early learning stages).
The older solution was sticking this in the Application_Start() of the Global.asax:
GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Serialize;
I suspect this is handled in the StartUp's ConfigureService() method but I don't know much beyond there.
Or is there a more appropriate way to handle this issue?
Accepted Answer
Okay... I finally found some reference material on this. The solution is:
public void ConfigureServices(IServiceCollection services)
{
...
services.AddMvc()
.AddJsonOptions(
options => options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
);
...
}
I got this from here
Popular Answer
If you are using ASP.NET Core 3.0, and experience that problem please install the NuGET package: Microsoft.AspNetCore.Mvc.NewtonsoftJson 3.0.0.
To replace the new System.Text.Json which does not yet have the Reference Loop Handling do this in the Startup.cs, make sure that in the ConfigureServices, is included:
If using the latest .Net Core 3.0 way:
services.AddControllers().AddNewtonsoftJson(options =>
{
options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
});
or the old way:
services.AddMvc(option => option.EnableEndpointRouting = false)
.AddNewtonsoftJson(options =>
options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore)
.SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
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