我正在开发连接到服务并使用一些JSON数据的应用程序。消费很好(JSON.net的岩石),但我想知道我应该抓住异常错误和显示简单的MessageBox?尝试在几个地方,但仍然我的应用程序正在关闭。或者,也许我应该根据包含错误标签的json响应来做到这一点?我认为正常的错误处理可能会更容易,但在现在脑子里一片空白点..WebClient方法在哪里捕获异常?
代码如下:
private void LoginLoginButton_Click(object sender, System.EventArgs e)
{
((ApplicationBarIconButton)ApplicationBar.Buttons[0]).IsEnabled = false;
ProgressOverlay.Show();
GenerateLoginString();
var w = new SharpGIS.GZipWebClient();
Observable.FromEvent<DownloadStringCompletedEventArgs>(w, "DownloadStringCompleted")
.Subscribe(r =>
{
var settings = IsolatedStorageSettings.ApplicationSettings;
var deserializedRootObject = JsonConvert.DeserializeObject<RootObject>(r.EventArgs.Result);
UserSettings us = new UserSettings()
{
first_name = deserializedRootObject.user.first_name,
last_name = deserializedRootObject.user.last_name,
user_id = deserializedRootObject.user_id,
};
settings.Add("UserSettings", us);
settings.Save();
});
w.DownloadStringAsync(new Uri(UserUri));
w.DownloadStringCompleted += new DownloadStringCompletedEventHandler(w_DownloadStringCompleted);
}
void w_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}
我试过这一个。但错误再次出现。它出现在UserSettings对象无法填充的时刻。情景是:如果登录数据没问题,我得到对象调用UserSettings,如果没有,我只有一个名为error的json条目:“error” – dargod
所以我想我应该尝试捕获异常,当我知道我会得到什么结果得到 – dargod