Xamarin使用MVVM两次绑定列表视图

Question

我尝试了使用MVVVM绑定两种列表视图的任何一种方法，但无法做到这一点。当我使用2个不同模型的相同API调用2个属性时，它要求我调用await函数。但是我希望这两个属性一次都获取API。

namespace Grading.ViewModel
{
    public class GradingViewModel
    {
        private ObservableCollection<GradingModel> items;

        public ObservableCollection<GradingModel> Items
        {
            get { return items; }
            set
            {
                items = value;
            }
        }

        public GradingViewModel()
        {
            Items = new ObservableCollection<GradingModel>()
            {

            };
            MyHTTP.GetAllNewsAsync(list =>
            {
                foreach (GradingModel item in list)
                    items.Add(item);
            });

        }

        public Details()
        {
            Items = new ObservableCollection<Details>()
            {

            };
            MyHTTP.GetAllNewsAsync(list =>
            {
                foreach (Details info in list)
                    Info.Add(info);
            });

        }

    }
}

Answer 1

如果要使用多个并行HTTP调用，则必须使用线程

var t1 = //first req
var t2 = //Second reg

await Task.WhenAll(t1, t2);

ApiResponse response1 = t1.Result;
if (response1.IsSuccess)
{
    //Success code
}

ApiResponse response2 = t2.Result;
if (response2.IsSuccess)
{
    //Success code
}