我正在开发Windows Phone 8应用程序。我想使用HTTP POST请求通过PHP web服务上传SQLite数据库，MIME类型为multipart/form-data，并使用名为"userid=SOME_ID"的字符串数据。
我不想使用第三方库，如HttpClient、RestSharp或MyToolkit。我尝试了下面的代码，但它不上传文件，也没有给我任何错误信息。它在Android、PHP等方面都很好运行，因此Web服务没有问题。以下是我提供的代码（适用于WP8）。哪里出了问题？
我已经谷歌过了，但没有找到针对WP8的具体解决方案。
我也尝试在Windows 8中解决我的问题，但它也没有起作用。
我不想使用第三方库，如HttpClient、RestSharp或MyToolkit。我尝试了下面的代码，但它不上传文件，也没有给我任何错误信息。它在Android、PHP等方面都很好运行，因此Web服务没有问题。以下是我提供的代码（适用于WP8）。哪里出了问题？
我已经谷歌过了，但没有找到针对WP8的具体解决方案。
async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(DBNAME);
//Below line gives me file with 0 bytes, why? Should I use
//IsolatedStorageFile instead of StorageFile
//var file = await ApplicationData.Current.LocalFolder.GetFileAsync(DBNAME);
byte[] fileBytes = null;
using (var stream = await file.OpenReadAsync())
{
fileBytes = new byte[stream.Size];
using (var reader = new DataReader(stream))
{
await reader.LoadAsync((uint)stream.Size);
reader.ReadBytes(fileBytes);
}
}
//var res = await HttpPost(Util.UPLOAD_BACKUP, fileBytes);
HttpPost(fileBytes);
}
private void HttpPost(byte[] file_bytes)
{
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://www.myserver.com/upload.php");
httpWebRequest.ContentType = "multipart/form-data";
httpWebRequest.Method = "POST";
var asyncResult = httpWebRequest.BeginGetRequestStream((ar) => { GetRequestStreamCallback(ar, file_bytes); }, httpWebRequest);
}
private void GetRequestStreamCallback(IAsyncResult asynchronousResult, byte[] postData)
{
//DON'T KNOW HOW TO PASS "userid=some_user_id"
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
Stream postStream = request.EndGetRequestStream(asynchronousResult);
postStream.Write(postData, 0, postData.Length);
postStream.Close();
var asyncResult = request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
private void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
streamResponse.Close();
streamRead.Close();
response.Close();
}
我也尝试在Windows 8中解决我的问题，但它也没有起作用。
public async Task Upload(byte[] fileBytes)
{
using (var client = new HttpClient())
{
using (var content = new MultipartFormDataContent("Upload----" + DateTime.Now.ToString(System.Globalization.CultureInfo.InvariantCulture)))
{
content.Add(new StreamContent(new MemoryStream(fileBytes)));
//Not sure below line is true or not
content.Add(new StringContent("userid=farhanW8"));
using (var message = await client.PostAsync("http://www.myserver.com/upload.php", content))
{
var input = await message.Content.ReadAsStringAsync();
}
}
}
}
var fileStream = new FileStream(filePath, FileMode.Open); form.Add(new StreamContent(fileStream), "profile_pic");- Bill TarbellhttpClient.Dispose();。同时，建议只实例化一次HttpClient。因此，在类中实例化它一次，并在需要时使用它。在类中实例化为private static readonly HttpClient client = new HttpClient();参考链接-"https://learn.microsoft.com/en-us/azure/architecture/antipatterns/improper-instantiation/" - Junaid Pathan