谷歌，加上API在C＃.NET librarry

Question

獲得活動列表我使用的.NET谷歌加API和我想的指定配置文件的活動清單（頁/用戶..）。

我有這樣的代碼，我得到它的在線

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; 

在這條線：

ActivityFeed activityFeed = list.Fetch(); 

我收到以下錯誤：

An item with the same key has already been added. 

Answer 1

請求的鍵無效。只要把正確的ClientSecret & ClientIdentifier。