Google加上API获得了C#.net库中的活动列表

Question

我正在使用.net Google Plus API，我想获得指定配置文件的活动列表（页面/用户..）。

我有这个代码，我在网上

 var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);
    provider.ClientIdentifier = GoogleIdentifier;
    provider.ClientSecret = GoogleSecret;
 ActivitiesResource.Collection collection = new ActivitiesResource.Collection();
  var service = new PlusService();
    service.Key = GoogleKey;
    ActivitiesResource.ListRequest list = service.Activities.List(ProfileID, collection);
    ActivityFeed activityFeed = list.Fetch();
    int count = activityFeed.Items.Count;

在这条线上：

ActivityFeed activityFeed = list.Fetch();

我得到以下错误：

An item with the same key has already been added.

Answer 1

请求的密钥无效。只要把正确的ClientSecret&客户端标识符。