vs xamarin android 读取rest

private void Btn_Click(object sender, EventArgs e){    var u = FindViewById<EditText>(Resource.Id.editText1).Text;    var p = FindViewById<EditText>(Resource.Id.editText2).Text;    var progressDialog = ProgressDialog.Show(this, "Please wait...", "Checking account info...", true);    var t=new Thread(new ThreadStart(delegate    {        var r = Api.CheckUser(u, p);        if (r.HasValue)        {            RunOnUiThread(() => progressDialog.Hide());            AppConfig.Config.SetNowUserId(r.Value);            StartActivity(typeof(MainActivity));            Finish();        }        else        {            RunOnUiThread(() => Toast.MakeText(this, "用户名或密码错误", ToastLength.Long).Show());            RunOnUiThread(() => progressDialog.Hide());        }                    }));    t.Start();}

把loading框显示出来，然后开新线程做事，之后关闭loading框。

因为是开新线程，所以如果希望更新界面，需要使用 RunOnUiThread方法

还有另外的方式

private readonly TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();

private void Btn_Click(object sender, EventArgs e){    var u = FindViewById<EditText>(Resource.Id.editText1).Text;    var p = FindViewById<EditText>(Resource.Id.editText2).Text;    var progressDialog = ProgressDialog.Show(this, "Please wait...", "Checking account info...", true);    Task.Factory.StartNew(() =>    {        return Api.CheckUser(u, p);    }).ContinueWith(r =>    {        progressDialog.Hide();        if (r.Result.HasValue)        {            AppConfig.Config.SetNowUserId(r.Result.Value);            StartActivity(typeof(MainActivity));            Finish();        }        else        {            Toast.MakeText(this, "用户名或密码错误", ToastLength.Long).Show();        }                    }, uiScheduler);}

使用Task的ContinueWith，可以指定在ui上执行

访问网络需要给permission，在项目属性里，Android Manifest 下面列出了所有的permission，打钩internet

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