Xamarin.Forms 使用HttpClient获取数据后卡死

具体原因还不清楚，需要使用以下的方式来加载数据（即在界面呈现时再加载数据而不是初始化时加载，可能是初始化时加载超时会出问题）：

public partial class ItemsPage : ContentPage
{
    public ItemsPage()
    {
        InitializeComponent();
        Vm = new ItemsViewModel();
        BindingContext = Vm;
    }

    protected override async void OnAppearing()
    {
        var playlist = await Vm.GetPlaylist();
        // Do something cool with the string, maybe some data binding.
    }

    // Public for data binding.
    public ItemsViewModel Vm { get; private set; }
}

https://stackoverflow.com/questions/36367702/xamarin-form-httpclient-stuck