/// <summary>
/// Uploads a photo to a facebook api as an asynchronous operation.
/// </summary>
/// <param name="filename">
/// The full file path of the photo.
/// </param>
/// <param name="endpoint">
/// The target api to request.
/// </param>
/// <param name="queries">
/// The query data to append to the endpoint.
/// </param>
/// <returns>
/// The task object representing the asynchronous operation.
/// </returns>
private static async Task <ResponseMessage <string> > UploadAsync(string filename, Uri endpoint, params KeyValuePair <string, string>[] queries)
{
// Queries.
endpoint = endpoint.AppendQueries(queries);
// Content.
var bytes = await File.ReadAllBytesAsync(filename);
var photoContent = new ByteArrayContent(bytes, 0, bytes.Length);
photoContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data");
photoContent.Headers.ContentDisposition.Parameters.Add(new NameValueHeaderValue("filename", $"{Guid.NewGuid().ToString("N")}{Path.GetExtension(filename)}"));
var content = new MultipartFormDataContent
{
photoContent
};
// Request.
var request = new HttpRequestMessage
{
RequestUri = endpoint,
Method = HttpMethod.Post,
Content = content
};
using (var client = new HttpClient())
{
var response = await client.SendAsync(request);
return(await response.ToResponseMessageAsync());
}
}
/// <summary>
/// Appends a query to a specified uri. If the target query already exists, it is overwritten.
/// </summary>
/// <param name="uri">
/// The target uri.
/// </param>
/// <param name="query">
/// The query to append.
/// </param>
/// <returns>
/// An <see cref="Uri"/> object.
/// </returns>
public static Uri AppendQuery(this Uri uri, KeyValuePair <string, string> query)
{
return(uri.AppendQueries(new List <KeyValuePair <string, string> >
{
query
}));
}