c# - 必须从主线程调用 Facebook GraphRequest.Start() 吗？

Question

我正在尝试按照此处提供的入门示例进行操作:https://components.xamarin.com/gettingstarted/facebookios

以下 GraphRequest 在主线程中执行时工作正常:

var request = new GraphRequest ("/me?fields=name", null, AccessToken.CurrentAccessToken.TokenString, null, "GET");
request.Start ((connection, result, error) => {
    // Handle if something went wrong with the request
    if (error != null) {
        new UIAlertView ("Error...", error.Description, null, "Ok", null).Show ();
        return;
    }

    // Get your profile name
    var userInfo = result as NSDictionary;
    nameLabel.Text = userInfo ["name"].ToString ();
});

但是，当我使用 Task.Run 从后台线程运行完全相同的代码时，似乎永远不会调用 request.Start 中的完成处理程序委托(delegate)。

GraphRequest是否只支持从主线程执行？

Answer 1

您可以使用:

var graphRequest = new GraphRequest ("/me?fields=name,gender", null, AccessToken.CurrentAccessToken.TokenString, null, "GET");
    var requestConnection = new GraphRequestConnection();
    requestConnection.AddRequest(graphRequest, (connection, result, error) =>
      {
        var profile = result;
      });
    requestConnection.Start();