如何设置HttpClient的内容类型

时间:2019-06-28 02:32:29

标签: xamarin.forms

我正在上传图片。

我想设置Content-Type =“ multipart / form-data; boundary = ---- WebKitFormBoundaryFoxUxCRayQhs5eNN”的值

使用代码:

HttpRequestMessage request=new HttpRequestMessage();
request.Content.Headers.ContentType="multipart/form-data; boundary=----WebKitFormBoundaryFoxUxCRayQhs5eNN";

request.Header.ContentType="multipart/form-data; boundary=----WebKitFormBoundaryFoxUxCRayQhs5eNN";

这将导致错误:所标识的项之一格式无效。

如果仅设置“ multipart / form-data”,则可以,但是无法上传文件。

如何设置?

1 个答案:

答案 0 :(得分:1)

以下是一些代码片段,您可以参考:

  using (var client = new HttpClient())
  using (var fileStream = File.Open(fileName, FileMode.Open, FileAccess.Read)
  using (var streamContent = new StreamContent(fileStream))
  {
     streamContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data");
     streamContent.Headers.ContentDisposition.Name = "\"file\"";
     streamContent.Headers.ContentDisposition.FileName = "\"" + fileName + "\"";
     streamContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
     string boundary = "WebKitFormBoundaryFoxUxCRayQhs5eNN";

     var fContent = new MultipartFormDataContent(boundary);
     fContent.Headers.Remove("Content-Type");
     fContent.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=" + boundary);
     fContent.Add(streamContent);

     var response = await client.PostAsync(new Uri(url), fContent);
     response.EnsureSuccessStatusCode();
  }

如果您使用HttpWebRequest,则可以参考以下内容:https://stackoverflow.com/a/20000831/10768653