Read POST data in request body

Question

User-284642143 posted

I am attempting to read some data for a POST request made to a URL i control.

The data is sent as JSON in the POST request body so i created a regular Handler and use HttpContext, i dont seem to find any option to read this data (I have tried .Form). 

Is there another way around this?

Answer 1

User475983607 posted

Read the input stream.  Assuming Web Forms...

    public partial class _Default : Page
    {
        public class Movie
        {
            public string Name { get; set; }
            public int Year { get; set; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if(Request.HttpMethod.ToUpper() == "POST")
            {
                Response.Clear();
                Stream stream = Request.InputStream;
                StreamReader sr = new StreamReader(stream);
                JsonSerializer serializer = new JsonSerializer();
                Movie movie = (Movie)serializer.Deserialize(sr, typeof(Movie));

                Response.Write(movie.Name);
                Response.ContentType = "text/html; charset=UTF-8";
                Response.End();
            }
        }


    }

https://www.newtonsoft.com/json/help/html/DeserializeWithJsonSerializerFromFile.htm

Answer 2

User-284642143 posted

Thanks, thats almost got me back on track. 

If i have 

var rte = new StreamReader(context.Request.InputStream).ReadToEnd();

then i see the data, however i cant convert pass that string into the Deserialize method it wont accept as its expecting a reader. If i change it to

StreamReader sr = new StreamReader(stream).ReadToEnd();

again it causes problems on conversions. Not sure if i've missed something simple? Thanks 

Answer 3

User475983607 posted

The code posted in my original post deserialized an HTTP JSON stream into a C# type.   

{
	"Name": "Star Wars",
	"Year": 1977
}

I tested the code before posting.

It's not clear why you are converting the JSON stream to a string, ReadToEnd(), then deserializing the string.  I cannot see your code, type, or JSON so I have no way to reproduce the issue.

Did you, at least, try the code I posted?

Maybe this is what to want?

if(Request.HttpMethod.ToUpper() == "POST")
{
    Response.Clear();
    string json = new StreamReader(Request.InputStream).ReadToEnd();
    Movie movie = JsonConvert.DeserializeObject<Movie>(json);

    Response.Write(movie.Name);
    Response.ContentType = "text/html; charset=UTF-8";
    Response.End();
}

https://www.newtonsoft.com/json/help/html/DeserializeObject.htm

Answer 4

User-284642143 posted
Yes I tried the code you posted. What was originally happening was the stream was empty/null. It's with trial and error that I got the data to show in debug mode.

I think what you have posted may do the trick. Let me give it a shot. Thanks