ValidatePayload

geotypes.json

{
    "@context": [
		"dtmi:dtdl:context;2",
		"dtmi:iotcentral:context;2"
	],
    "@id": "dtmi:samplesv2:geoTypes;1",
    "@type": "Interface",
    "contents": [
      {
        "@type": "Telemetry",
        "name": "myPoint",
        "schema": "point"
      },
      {
          "@type": ["Telemetry", "Location"],
          "name": "myGeopoint",
          "schema": "geopoint"
      }
    ]
  }

Program.cs

using Microsoft.Azure.DigitalTwins.Parser;
using Microsoft.Azure.DigitalTwins.Parser.Models;
using System.Text.Json;

string basePath = Path.Join(System.Reflection.Assembly.GetExecutingAssembly().Location + @"./../../../");

string ReadFile(string path) => File.ReadAllText(Path.Join(basePath, path));
string ToJs(object obj) => JsonSerializer.Serialize(obj);

var objectModel = new ModelParser().Parse(new string[] { ReadFile("geotypes-1.json") });

var rootInterface = (DTInterfaceInfo)objectModel[new Dtmi("dtmi:samplesv2:geoTypes;1")];

var myPoint = (DTTelemetryInfo)rootInterface.Contents["myPoint"];
var validPayload = myPoint.Schema.ValidateInstance(ToJs(new { type = "Point", coordinates = new double[] { 12.35, 23.56} }));
Console.WriteLine(validPayload);

var myGeopoint = (DTTelemetryInfo)rootInterface.Contents["myGeopoint"];
var validPayload2 = myGeopoint.Schema.ValidateInstance(ToJs(new { lat =12.35, lon = 23.56 }));
Console.WriteLine(validPayload2);

validate-payload.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <RootNamespace>validate_payload</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.DigitalTwins.Parser" Version="6.1.0-preview" />
  </ItemGroup>

</Project>