C# HttpClient将带有消息的照片发布到Facebook图表

发行

我正试图上传一张照片到Facebook的API与一条消息

代码片段-上载

代码-webRequestClient

注释

如果我删除messageContent：它会上传图片 如果我使用MultipartContent：它上载图片，但忽略我的消息 现在不必为我为什么不使用异步功能而烦恼了 当它失败时，我会收到错误的请求 当我将message=helloworld附加到requestUri中时，它可以工作，但这不是我的体系结构中处理此问题的最灵活的解决方案。

---

选中此选项将解决您的问题，或者您必须通过流发送图像，然后您不需要明确地告诉类型是image/jpeg

protected async void TakePictureAndUpload()
{
    var ui = new CameraCaptureUI();
    var file = await ui.CaptureFileAsync(CameraCaptureUIMode.Photo);
    if (file != null)
    {    
        byte[] myPicArray = await GetPhotoBytesAsync(file);
        HttpClient httpClient = new HttpClient();
        httpClient.BaseAddress = new Uri("http://yourdomainname.com");

        MultipartFormDataContent form = new MultipartFormDataContent();
        HttpContent content = new ByteArrayContent(myPicArray);
        form.Add(content, "media", "filename.jpg");
        content = new StringContent("my-username");
        form.Add(content, "username");
        HttpResponseMessage response = await httpClient.PostAsync("directory/my-site.php", form);
     }
}
public async Task<byte[]> GetPhotoBytesAsync(StorageFile file)
{
    IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read);
    var reader = new Windows.Storage.Streams.DataReader(fileStream.GetInputStreamAt(0));
    await reader.LoadAsync((uint)fileStream.Size);

    byte[] pixels = new byte[fileStream.Size];
    reader.ReadBytes(pixels);
    return pixels;
}

    public string Post(string uri, HttpContent postData)
    {
        return PostAsync(uri, postData).Result;
    }

    public async Task<string> PostAsync(string uri, HttpContent httpContent)
    {
        string resultStream;
        using (var httpClient = new HttpClient())
        {
            var response = await httpClient.PostAsync(uri, httpContent);
            response.EnsureSuccessStatusCode();
            resultStream = await response.Content.ReadAsStringAsync();
        }
        return resultStream;
    }

protected async void TakePictureAndUpload()
{
    var ui = new CameraCaptureUI();
    var file = await ui.CaptureFileAsync(CameraCaptureUIMode.Photo);
    if (file != null)
    {    
        byte[] myPicArray = await GetPhotoBytesAsync(file);
        HttpClient httpClient = new HttpClient();
        httpClient.BaseAddress = new Uri("http://yourdomainname.com");

        MultipartFormDataContent form = new MultipartFormDataContent();
        HttpContent content = new ByteArrayContent(myPicArray);
        form.Add(content, "media", "filename.jpg");
        content = new StringContent("my-username");
        form.Add(content, "username");
        HttpResponseMessage response = await httpClient.PostAsync("directory/my-site.php", form);
     }
}
public async Task<byte[]> GetPhotoBytesAsync(StorageFile file)
{
    IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read);
    var reader = new Windows.Storage.Streams.DataReader(fileStream.GetInputStreamAt(0));
    await reader.LoadAsync((uint)fileStream.Size);

    byte[] pixels = new byte[fileStream.Size];
    reader.ReadBytes(pixels);
    return pixels;
}