How to get response body from httpclient c# when doing multipart

问题

I am trying to post multipart data using System.Net.Http.HttpClient, the obtained response is 200 ok.

Here is the Method I used:

 public async Task postMultipart()
        {
            var client = new HttpClient();
            client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "multipart/form-data");


            // This is the postdata
            MultipartFormDataContent content = new MultipartFormDataContent( );
            content.Add(new StringContent("12", Encoding.UTF8), "userId");
            content.Add(new StringContent("78", Encoding.UTF8), "noOfAttendees");
            content.Add(new StringContent("chennai", Encoding.UTF8), "locationName");
            content.Add(new StringContent("32.56", Encoding.UTF8), "longitude");
            content.Add(new StringContent("32.56", Encoding.UTF8), "latitude");

            Console.Write(content);
            // upload the file sending the form info and ensure a result.
            // it will throw an exception if the service doesn't return a valid successful status code
            await client.PostAsync(fileUploadUrl, content)
                .ContinueWith((postTask) =>
                {
                    postTask.Result.EnsureSuccessStatusCode();
                });

        }

How to obtain the response body from this method?

回答1:

To echo Jon (one does not simply disagree with Jon), do not mix the async/await world with the pre-async/await (ContinueWith) world.

To get the response body as a string you need a 2nd await:

var response = await client.PostAsync(fileUploadUrl, content);
response.EnsureSuccessStatusCode();
var body = await response.Content.ReadAsStringAsync();

回答2:

Hint: you're calling PostAsync, and awaiting the result... but then not doing anything with it. It's not clear why you're using ContinueWith either, when you're in an async world and can just handle it simply:

var response = await client.PostAsync(fileUploadUrl, content);
response.EnsureSuccessStatusCode();
// Now do anything else you want to with response,
// e.g. use its Content property

来源：https://stackoverflow.com/questions/29078917/how-to-get-response-body-from-httpclient-c-sharp-when-doing-multipart

标签

windows-phone

multipartform-data

dotnet-httpclient