Returning 2D arrays on API

[scalablecory]

From @btogkas on Monday, September 30, 2019 8:26:22 AM

Trying to return two dimensional decimal array from Controller.

public ActionResult<decimal[,]> TwoDArray()

This does not work on .Net Core 3 but works on 2.2
(Other methods work normally)

The configuration instead of UseMVC is

app.UseRouting();
app.UseEndpoints(x =>
{
x.MapControllers();
});

Is there something missing or?

Copied from original issue: dotnet/core#3510

[pranavkm]

This sounds like a limitation of System.Text.Json, it does not support multi-dimensional arrays are not supported. (cc /@steveharter / @ahsonkhan ). You should be able to continue using Newtonsoft.Json-based formatters to get the 2.x behavior: https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.0&tabs=visual-studio#jsonnet-support