public Task <FileMessage> SendImage(GroupChannel channel, string userId, string userName, string memberToken, string fileUrl, string date)
{
var tcs = new TaskCompletionSource <FileMessage>();
if (channel == null)
{
tcs.TrySetCanceled();
return(tcs.Task);
}
var file = new SBFile(fileUrl);
channel.SendFileMessage(file, file.FileName, "image/jpeg", (int)file.Length, date, (FileMessage message, SendBirdException e) => {
if (e != null)
{
tcs.TrySetCanceled();
}
tcs.TrySetResult(message);
SendPushNotification(userId, userName, memberToken, "", NotificationType.Image);
});
return(tcs.Task);
}