做多部分时如何从httpclient c#获取响应正文

Question

我正在尝试 post 使用 System.Net.Http.HttpClient 的多部分数据，获得的响应是 200 ok.

这是我使用的方法：

 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();
                });

        }

如何从该方法获取响应体？

Answer 1

提示：您正在调用 PostAsync，并等待结果...但随后没有对其进行任何操作。当您处于异步世界并且可以简单地处理它时，您也不清楚为什么要使用 ContinueWith：

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

Answer 2

为了呼应 Jon（不是简单地不同意 Jon），不要将 async/await 世界与 async/await (ContinueWith) 之前的世界混为一谈。

要将响应正文作为字符串获取，您需要第二次等待：

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

做多部分时如何从httpclient c#获取响应正文

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

c#

windows-phone

multipartform-data

dotnet-httpclient