Map JSON object to class in Azure Function API Request class parameter

Question

Map JSON object to class c# property Use case : I am creating API in Azure Function and passing parameter-ReservationDraftRequestDto class like below code

[FunctionName("Function1")] public static async Task Run( [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] ReservationDraftRequestDto reservationDraftRequestDto, ILogger log) { }

DTO class:

API URI: http://localhost:7071/api/Function1 JSON-for calling API is: { "SoftHoldIDs": 444, "AppliedUsages": [ { "SoftHoldID": 444, "UsageYearID": 4343, "DaysApplied": 0, "PointsApplied": 1 } ], "Guests": [ 1, 2 ] }

public class ReservationDraftRequestDto
{

    public int SoftHoldIDs { get; set; }
    public int[] Guests { get; set; }
    public AppliedUsage[] AppliedUsages { get; set; }

}


public class AppliedUsage
{
    public int SoftHoldID { get; set; }
    public int UsageYearID { get; set; }
    public int DaysApplied { get; set; }
    public int PointsApplied { get; set; }
}

Issue is: When i called API with above payload then API class parameter-ReservationDraftRequestDto not mapped AppliedUsages array values.

Please let me know what i need to do map API JSON payload to ReservationDraftRequestDto

Send Request-

Code:

Rena Rena · Accepted Answer · 2019-10-15T08:46:34

It is by design.The binding logic is explicitly excluding arrays while deserializing the json body contents.You could refer to here.

If you want to get the object,here is a simple workaround:

[FunctionName("Function1")]
public static async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequest req,
    ILogger log)
{
    var reservationDraftRequestDto = req.DeserializeModel<ReservationDraftRequestDto>();

    var data = JsonConvert.SerializeObject(reservationDraftRequestDto);
    //more logic...
    return new OkResult();
}
public static T DeserializeModel<T>(this HttpRequest request)
{
    using (var reader = new StreamReader(request.Body))
    using (var textReader = new JsonTextReader(reader))
    {
        request.Body.Seek(0, SeekOrigin.Begin);
        var serializer = JsonSerializer.Create(new JsonSerializerSettings()
        {
            ContractResolver = new CamelCasePropertyNamesContractResolver()
        });
        return serializer.Deserialize<T>(textReader);
    }
}

Result:

Map JSON object to class in Azure Function API Request class parameter

1 Answers