How to Upload Files via HTTP POST Multipart/Form-Data in Windows Phone 8 and Windows 8?

Windows Phone 8 and Windows 8 use HTTP POST Multipart/Form-Data to upload files to the server

To upload files to the server using HTTP POST multipart/form-data in Windows Phone 8 or Windows 8, you need to follow the following steps:

You have provided a code snippet that attempts to upload a file using HttpWebRequest. However, there are some issues in the code that need to be fixed:

• var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(DBNAME); This code gets the files from the package installation directory instead of from local storage. Should be changed to var file = await ApplicationData.Current.LocalFolder.GetFileAsync(DBNAME);.
• var res = await HttpPost(Util.UPLOAD_BACKUP, fileBytes); This code starts an asynchronous HTTP POST request, but it never waits for the result. res.Wait(); should be called to wait for the result.
• The currently implemented HttpPost method does not support multipart/form-data requests. You need to create an HttpContentMultipart instance and add the file content and any other parameters to the multipart content.

Here’s an example of how to modify your code to upload files using multipart/form-data:

<code class="language-csharp">//假设您还有一个名为“userid”的字符串变量，其中包含用户 ID
private async void HttpPost(byte[] fileBytes)
{
    HttpClient httpClient = new HttpClient();
    MultipartFormDataContent multipartContent = new MultipartFormDataContent();
    HttpContent fileContent = new ByteArrayContent(fileBytes);
    multipartContent.Add(fileContent, "file", "filename.db");
    multipartContent.Add(new StringContent(userid), "userid", "userdata.txt");

    var response = await httpClient.PostAsync("http://www.myserver.com/upload.php", multipartContent);
    // ...
}</code>

In Windows 8, you can use the HttpClient class to upload files using multipart/form-data. Here's an example of how to do it:

<code class="language-csharp">//假设您还有一个名为“userid”的字符串变量，其中包含用户 ID
public async Task Upload(byte[] fileBytes)
{
    using (HttpClient httpClient = new HttpClient())
    {
        using (MultipartFormDataContent form = new MultipartFormDataContent())
        {
            form.Add(new StringContent(username), "username");
            form.Add(new StringContent(useremail), "email");
            form.Add(new StringContent(password), "password");
            form.Add(new ByteArrayContent(fileBytes, 0, fileBytes.Length), "profile_pic", "hello1.jpg");
            HttpResponseMessage response = await httpClient.PostAsync("http://www.myserver.com/upload.php", form);
            // ...
        }
    }
}</code>

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