JSON De/serialization

Our SDK handles the de/serialization of the AAS models from and to JSON format through the static class Jsonization.

Serialize

To serialize, you call the method ToJsonObject of Jsonization.Serialize static class on an instance of Environment which will convert it to an instance of System.Text.Json.Nodes.JsonObject.

Here is a snippet that converts the environment first into an System.Text.Json.Nodes.JsonObject, and next converts the JSON object to text:

using System.Collections.Generic;

using Aas = AasCore.Aas3_0_RC02;
using AasJsonization = AasCore.Aas3_0_RC02.Jsonization;

public class Program
{
    public static void Main()
    {
        // Prepare the environment
        var someProperty = new Aas.Property(
            Aas.DataTypeDefXsd.Boolean)
        {
            IdShort = "someProperty",
        };

        var submodel = new Aas.Submodel(
            "some-unique-global-identifier")
        {
            SubmodelElements = new List<Aas.ISubmodelElement>()
            {
                someProperty
            }
        };

        var environment = new Aas.Environment()
        {
            Submodels = new List<Aas.ISubmodel>()
            {
                submodel
            }
        };

        // Serialize to a JSON object
        var jsonObject = AasJsonization.Serialize.ToJsonObject(
            environment
        );

        // Print the JSON object
        System.Console.WriteLine(jsonObject);

        // Outputs:
        // {
        //   "submodels": [
        //     {
        //       "id": "some-unique-global-identifier",
        //       "submodelElements": [
        //         {
        //           "idShort": "someProperty",
        //           "valueType": "xs:boolean",
        //           "modelType": "Property"
        //         }
        //       ],
        //       "modelType": "Submodel"
        //     }
        //   ]
        // }
    }
}

De-serialize

Our SDK can convert a System.Text.Json.Nodes.JsonNode back to an instance of Environment. All you have to do is call the method EnvironmentFrom from the static class Jsonization.Deserialize.

Here is an example snippet:

using Nodes = System.Text.Json.Nodes;

using Aas = AasCore.Aas3_0_RC02;
using AasJsonization = AasCore.Aas3_0_RC02.Jsonization;

public class Program
{
    public static void Main()
    {
        var text = @"{
  ""submodels"": [
    {
      ""id"": ""some-unique-global-identifier"",
      ""submodelElements"": [
        {
          ""idShort"": ""someProperty"",
          ""valueType"": ""xs:boolean"",
          ""modelType"": ""Property""
        }
      ],
      ""modelType"": ""Submodel""
    }
  ]
}";
        var jsonNode = Nodes.JsonNode.Parse(
            text);

        // De-serialize from the JSON node
        Aas.Environment environment = (
            AasJsonization.Deserialize.EnvironmentFrom(
                jsonNode)
        );

        // Print the types of the model elements contained
        // in the environment
        foreach (var something in environment.Descend())
        {
            System.Console.WriteLine(something.GetType());
        }

        // Outputs:
        // AasCore.Aas3_0_RC02.Submodel
        // AasCore.Aas3_0_RC02.Property
    }
}

Errors

If there are any errors during the de-serialization, a Jsonization.Exception will be thrown. Errors occur whenever we encounter invalid JSON values. For example, the de-serialization method expects a JSON object, but encounters a JSON array instead.