问题描述
我正在尝试通过 Windows 商店应用程序中的 HTTP 帖子向服务器发送一些图像 + 一些元数据,但在尝试将数据实际包含在帖子中时卡住了.由于商店应用程序 API 发生了变化,因此无法像在 Windows 窗体应用程序或类似应用程序中那样完成此操作.
I'm trying to send some images + some meta data to a server by HTTP post from a windows store app but get stuck when trying to actually include the data in the post. It cannot be done the way you would accomplish this in a windows forms app or similar due to the changes to the store app API.
我收到错误消息.
cannot convert source type byte[] to target type System.Net.Http.httpContent
现在这显然是因为它是 2 种不同的类型,不能隐式转换,但这基本上是我希望能够做的.如何将我的字节数组数据转换为 httpContent 类型,以便我可以将其包含在以下调用中
now this is obviously because it's 2 different types that can't be implicitly casted, but it's basically what I'm looking to be able to do. How do I make get my byte array data into the httpContent type so I can include it in the following call
httpClient.PostAsync(Uri uri,HttpContent content);
这是我的完整上传方法:
here's my full upload method:
async private Task UploadPhotos(List<Photo> photoCollection, string recipient, string format)
{
PhotoDataGroupDTO photoGroupDTO = PhotoSessionMapper.Map(photoCollection);
try
{
var client = new HttpClient();
client.MaxResponseContentBufferSize = 256000;
client.DefaultRequestHeaders.Add("Upload", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
// POST action_begin
const string actionBeginUri = "http://localhost:51139/PhotoService.axd?action=Begin";
HttpResponseMessage response = await client.GetAsync(actionBeginUri);
response.EnsureSuccessStatusCode();
string responseBodyAsText = await response.Content.ReadAsStringAsync();
string id = responseBodyAsText;
////
// POST action_upload
Uri actionUploadUri = new Uri("http://localhost:51139/PhotoService.axd?action=Upload&brand={0}&id={1}&name={2}.jpg");
var metaData = new Dictionary<string, string>()
{
{"Id", id},
{"Brand", "M3rror"}, //TODO: Denne tekst skal komme fra en konfigurationsfil.
{"Format", format},
{"Recipient", recipient}
};
string stringData = "";
foreach (string key in metaData.Keys)
{
string value;
metaData.TryGetValue(key, out value);
stringData += key + "=" + value + ",";
}
UTF8Encoding encoding = new UTF8Encoding();
byte[] byteData = encoding.GetBytes(stringData);
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, actionUploadUri);
// send meta data
// TODO get byte data in as content
HttpContent metaDataContent = byteData;
HttpResponseMessage actionUploadResponse = await client.PostAsync(actionUploadUri, metaDataContent);
actionUploadResponse.EnsureSuccessStatusCode();
responseBodyAsText = await actionUploadResponse.Content.ReadAsStringAsync();
// send photos
// TODO get byte data in as content
foreach (byte[] imageData in photoGroupDTO.PhotosData)
{
HttpContent imageContent = imageData;
actionUploadResponse = await client.PostAsync(actionUploadUri, imageContent);
actionUploadResponse.EnsureSuccessStatusCode();
responseBodyAsText = await actionUploadResponse.Content.ReadAsStringAsync();
}
////
// POST action_complete
const string actionCompleteUri = "http://localhost:51139/PhotoService.axd?action=Complete";
HttpResponseMessage actionCompleteResponse = await client.GetAsync(actionCompleteUri);
actionCompleteResponse.EnsureSuccessStatusCode();
responseBodyAsText = await actionCompleteResponse.Content.ReadAsStringAsync();
////
}
catch (HttpRequestException e)
{
}
catch (Exception e)
{
Debug.WriteLine(e.ToString());
}
}
推荐答案
使用 System.Net.Http.ByteArrayContent
会更直接.例如:
It will be more straightforward to use System.Net.Http.ByteArrayContent
. E.g:
// Converting byte[] into System.Net.Http.HttpContent.
byte[] data = new byte[] { 1, 2, 3, 4, 5};
ByteArrayContent byteContent = new ByteArrayContent(data);
HttpResponseMessage reponse = await client.PostAsync(uri, byteContent);
仅用于具有特定文本编码的文本:
For text only with an specific text encoding use:
// Convert string into System.Net.Http.HttpContent using UTF-8 encoding.
StringContent stringContent = new StringContent(
"blah blah",
System.Text.Encoding.UTF8);
HttpResponseMessage reponse = await client.PostAsync(uri, stringContent);
或者如上所述,对于使用 multipart/form-data 的文本和图像:
Or as you mentioned above, for text and images using multipart/form-data:
// Send binary data and string data in a single request.
MultipartFormDataContent multipartContent = new MultipartFormDataContent();
multipartContent.Add(byteContent);
multipartContent.Add(stringContent);
HttpResponseMessage reponse = await client.PostAsync(uri, multipartContent);
这篇关于在商店应用程序中通过 HTTP POST 发送字节数组的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!