How to pass parameters by POST to an Azure function?

In case google took you here, this is how it's done in March 2019 (Azure Functions v3):

public static async void Run(            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)]            HttpRequest req,            ILogger log)        {            var content = await new StreamReader(req.Body).ReadToEndAsync();            MyClass myClass = JsonConvert.DeserializeObject<MyClass>(content);                    }

To get the request content from the request body(post request), you could use req.Content.ReadAsAsync method. Here is the code sample.

Sample request body.

{    "name": "Azure"}

Define a class to deserialize the post data.

public class PostData{    public string name { get;set; }    }

Get the post data and display it.

PostData data = await req.Content.ReadAsAsync<PostData>();log.Info("name:" + data.name);

Client side code to send the post request.

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("function-url");req.Method = "POST";req.ContentType = "application/json";Stream stream = req.GetRequestStream();string json = "{\"name\": \"Azure\" }";byte[] buffer = Encoding.UTF8.GetBytes(json);stream.Write(buffer,0, buffer.Length);HttpWebResponse res = (HttpWebResponse)req.GetResponse();

If you are using System.Text.Json, you can read the POST data in one line:

public static async Task Run(    [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)]    HttpRequest req,    ILogger log){    MyClass myClass = await JsonSerializer.DeserializeAsync<MyClass>(req.Body);}

If you are using Newtonsoft.Json, see the answer by Allen Zhang.