Question 103086 in Azure Question posted in
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.NET Azure Functions – Model binding

Is it possible to automatically bind a model in a parameter in Azure Functions? Similar to how it is done in WebApi controllers? Essentially, when a post body is received, it would be automatically deserialized. And when a query is received, it would also be automatically deserialized. Alternatively, do you have a reliable manual implementation for doing this? Thanks.

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2

Answers


  1. 0

    POST in Azure Functions:

    public async Task Run([HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req, ILogger log)
{          
   var messageJson = await new StreamReader(req.Body).ReadToEndAsync();
   var myModel = JsonConvert.DeserializeObject<ModelDto>(messageJson);
   
   //do something   
}

    GET in Azure Functions:

    public async Task Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req, ILogger log)
{
   // BODY          
   var messageJson = await new StreamReader(req.Body).ReadToEndAsync();
   var myModel = JsonConvert.DeserializeObject<ModelDto>(messageJson);
   
   // QUERY - assuming you are sending json as a query parameter
   string queryJson = req.Query["myQuery"];
   var myModel2 = JsonConvert.DeserializeObject<ModelDto>(queryJson);
   //do something   
}

    NOTE: If you need to send body in a GET request there is something wrong with the logic. In HTTP, GET method is specifically defined to not to include a request body.

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  2. 0

    I hope it helps. Alternatively, add header deserialization.

    Query – Get

    public T AsQueryResult<T>(FunctionContext executionContext)
{
    var queryParameters = executionContext.BindingContext.BindingData.SingleOrDefault(x => x.Key == "Query");

    var queryJson = queryParameters.Value!.ToString();

    return JsonConvert.DeserializeObject<T>(queryJson); 
}

    Body – Post

    public T AsBodyResult<T>(HttpRequest req)
{
    var body = new StreamReader(req.Body).ReadToEnd();

    return JsonConvert.DeserializeObject<T>(body);
}
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