Windows商店应用程序在没有互联网时崩溃

我正在创建我的第一个windows商店应用程序，我在启动期间有几个web服务调用，也定期通过应用程序。然而，我注意到我的应用程序不会启动/崩溃或只是关闭，当我没有互联网访问，因为web服务调用。我希望我的应用程序以正常的方式启动与一些初始数据，似乎正常，即使没有互联网接入。我从webservice获得的数据主要是天气数据，我在各种文本框和图表中显示。

下面的代码显示了我扩展的启动屏幕中的webservice调用。

public sealed partial class ExtendedSplashScreen : Page
{
//parameterItem max1DayAgo = new parameterItem();
//parameterItem min1DayAgo = new parameterItem();

public ExtendedSplashScreen()
{
    this.InitializeComponent();
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached.  The Parameter
/// property is typically used to configure the page.</param>
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
    string[] periodSelector = { "1DayAgo", "1WeekAgo", "1MonthAgo" };
    string[] modeSelector = { "max", "min" };
    string[] parameterSelector = { "umtTemp1", "umtWindSpeed", "umtAdjBaromPress", "umtRainRate" };

    //Create a webservice object
    ServiceReference.WebServiceSoapClient webServiceObj = new ServiceReference.WebServiceSoapClient();
    //First we create an object that holds max data for yesterday
    var getMax1DayAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[0], modeSelector[0]);
    //create an object that holds min data for yesterday
    var getMin1DayAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[0], modeSelector[1]);
    //Save arrayOfValue and arrayOfUnit to a parameterItem object. these objects are created during startup
    // and the can be accessed and updated by all methods in this page later we will see that maxMinButton_Click method
    //for the maxMinButton will use these data
    //create an object that holds max data for last week
    var getMax1WekAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[1], modeSelector[0]);
    //create an object that holds min data for last week
    var getMin1WekAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[1], modeSelector[1]);
    //create an object that holds max data for last month
    var getMax1MonthAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[2], modeSelector[0]);
    //create an object that holds min data for last month
    var getMin1MonthAgoObj = await webServiceObj.GetSelectedMaxMinDataAsync(parameterSelector, periodSelector[2], modeSelector[1]);

    (App.Current as App).max1DayAgo.arrayOfValue = getMax1DayAgoObj.arrayOfValue;
    (App.Current as App).max1DayAgo.arrayOfUnit = getMax1DayAgoObj.arrayOfUnit;
    (App.Current as App).min1DayAgo.arrayOfValue = getMin1DayAgoObj.arrayOfValue;
    (App.Current as App).min1DayAgo.arrayOfUnit = getMin1DayAgoObj.arrayOfUnit;

    (App.Current as App).max1WeekAgo.arrayOfValue = getMax1WekAgoObj.arrayOfValue;
    (App.Current as App).max1WeekAgo.arrayOfUnit = getMax1WekAgoObj.arrayOfUnit;
    (App.Current as App).min1WeekAgo.arrayOfValue = getMin1WekAgoObj.arrayOfValue;
    (App.Current as App).min1WeekAgo.arrayOfUnit = getMin1WekAgoObj.arrayOfUnit;
    (App.Current as App).max1MonthAgo.arrayOfValue = getMax1MonthAgoObj.arrayOfValue;
    (App.Current as App).max1MonthAgo.arrayOfUnit = getMax1MonthAgoObj.arrayOfUnit;
    (App.Current as App).min1MonthAgo.arrayOfValue = getMin1MonthAgoObj.arrayOfValue;
    (App.Current as App).min1MonthAgo.arrayOfUnit = getMin1MonthAgoObj.arrayOfUnit;

    string[] startupData = new string[13];

    startupData[0] = " " + (App.Current as App).max1DayAgo.arrayOfValue[0] + " " + (App.Current as App).max1DayAgo.arrayOfUnit[0]; //    maxTemp 
    startupData[1] = " " + (App.Current as App).max1DayAgo.arrayOfValue[1] + " " + (App.Current as App).max1DayAgo.arrayOfUnit[1]; //    maxWindSped 
    startupData[2] = " " + (App.Current as App).max1DayAgo.arrayOfValue[2] + " " + (App.Current as App).max1DayAgo.arrayOfUnit[2]; //    maxAirPressure 
    startupData[3] = " " + (App.Current as App).max1DayAgo.arrayOfValue[3] + " " + (App.Current as App).max1DayAgo.arrayOfUnit[3];//     maxRainfall
    startupData[4] = " " + (App.Current as App).min1DayAgo.arrayOfValue[0] + " " + (App.Current as App).min1DayAgo.arrayOfUnit[0]; //    minTemp 
    startupData[5] = " " + (App.Current as App).min1DayAgo.arrayOfValue[1] + " " + (App.Current as App).min1DayAgo.arrayOfUnit[1];//     minWindSped 
    startupData[6] = " " + (App.Current as App).min1DayAgo.arrayOfValue[2] + " " + (App.Current as App).min1DayAgo.arrayOfUnit[2];//     minAirPressure  
    startupData[7] = " " + (App.Current as App).min1DayAgo.arrayOfValue[3] + " " + (App.Current as App).min1DayAgo.arrayOfUnit[3];//     minRainfall

    // Main fields
    // ServiceReference.WebServiceSoapClient webServiceObj = new ServiceReference.WebServiceSoapClient();
    var getLatestTempObj = await webServiceObj.GetLatestDataAsync("umtTemp1");
    var getLatestWindObj = await webServiceObj.GetLatestDataAsync("umtWindSpeed");
    var getLatestwindDirObj = await webServiceObj.GetLatestDataAsync("umtAdjWinDir");
    var getLatestairPressureObj = await webServiceObj.GetLatestDataAsync("umtAdjBaromPress");
    startupData[8] = " " + getLatestTempObj.Value + " " + getLatestTempObj.Unit;//temperatureMainTxtBlock.Text
    startupData[9] = " " + getLatestWindObj.Value + " " + getLatestWindObj.Unit;//temperatureMainTxtBlock.Text
    startupData[10] = "" + getLatestwindDirObj.Value; //temperatureMainTxtBlock.Text
    startupData[11] = " " + getLatestairPressureObj.Value + " " + getLatestairPressureObj.Unit;//temperatureMainTxtBlock.Text
    startupData[12] = "Last update: " + getLatestwindDirObj.Timestamp;//temperatureMainTxtBlock.Text
    //save the startup data to the global variables
    (App.Current as App).NavigateData = startupData;

    this.Frame.SetNavigationState(e.Parameter as string);
    this.Frame.Navigate(typeof(MainPage));
}
}