UWP-058 - UWP Weather - Setup and Working with the Weather API

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    Lower half of the screen turned dark after minute 24

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    Adam Hecktman

    I am not even a C# developer (a student in Java right now) and I found this incredibly valuable. Answered some questions I have had for a long time now. Thanks for putting out this series.

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    @kiko: Hmm... thanks for pointing that out ... I'm not sure what happened there.

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    @kiko: Bob made me aware of this, we are uploading a new version, may be an hour before it is corrected

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    @kiko: and we're updated with the new version Bob sent over :)

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    If someone has a problem to call API you may need to add


    to your url call. You well get your key after registration on OpenWeather.com .

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    When I run the UWP-058\UWPWeather project and click the Get Weather button, the following code causes and exception.

    RootObject myWeather =  await OpenWeatherMapProxy.GetWeather(

    Visual Studio is stating 'Geocoordinate.Latitude.get' is obsolete: Latitude may be altered or unavailable after Windows 8.1. Instead, use Point.Position.

    I have tried adding my own key (&appid=yourKey) to the end of var response = await http.GetAsync("http://api.openweathermap.org/data/2.5/weather?lat=32.77&lon=-96.79&units=imperial&appid="***myKey***"); on the OpenWeatherMapProxy class and that did not solve the problem.

    Changing the code to the following also did not work.

    Geoposition position = await LocationManager.GetPosition();
    await OpenWeatherMapProxy.GetWeather(

    Does anyone know how to solve this exception.

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    For me the sample code snippet doesn't work. Any one else with the same problem?


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    @zur: When you say "Visual Studio is complaining" ... Yes, Visual Studio will complain.  While that API has been deprecated, at the time of this recording there was no replacement that I was aware of.  The key is: does it COMPILE and run?  (It should ... that's my exact code).

    @Hemanzt: Could you be more specific?  I'll help if I can.

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    Ted Driver

    Are you aware that Visual Studio will do the JSON to C# conversion for you? Just copy the JSON as you did, and then create a new class file in Visual Studio. Then select Edit Menu|Paste Special|Copy JSON as classes. Works for XML too.

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    @Ted Driver: Doh!  Yes, now that you mention it I have heard that but clearly got stuck in my old ways.  Thank you!  I'll try to remember that next time.

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    Why on earth use the DataContractJsonSerializer and oblige yourself to write all this code and datacontract/datamember decorations (ugly stuff), and NOT use Newtonsoft.Json in one line (return JsonConvert.DeserializeObject<RootObject>(result);)? It's become industry standard nowadays. :)

    Still, great stuff Bob. Thanks a bunch for your effort.
    Great point Ted, didn't know this special paste function even existed. ;)

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    Thanks again for a great video Bob.

    ToyMaker, that is a great tip. You can replace 3 lines of code with just one.

                //var serializer = new DataContractJsonSerializer(typeof(RootObject));
                //var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
                //var data = (RootObject)serializer.ReadObject(ms);

    Replaced with:

    var data = JsonConvert.DeserializeObject<RootObject>(result);




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    I have to abandon yet again another try at coding. Followed it exactly.

    'System.Runtime.Serialization.Json.DataContractJsonSerializer' is a 'type' but is used like a 'variable'

    what does that mean??


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    How Can I use my own txt file with json format to add data like:

    {"city":"London","description":"overcast clouds",....}

    instead of using these

    var http = new HttpClient();
    var response =await http.GetAsync(string.Format(""));
    var result = await response.Content.ReadAsStringAsync();

    actualy how can I use txt file for data?


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    When i click the button i have the following error : NullReferenceException at the ResultTextBlock step.

     async void Button_Click(object sender, RoutedEventArgs e)

    RootObject myWeather = await OpenWeatherMapProxy.GetWeather(20.0, 30.0);
    ResultTextBlock.Text = myWeather.name + " - " + ((int)myWeather.main.temp).ToString() + " - " + myWeather.weather[0].description;

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    some of properties should be double. Such as "deg". Because the deg is decimal. That was the error for me.
    And the other thing; in the url, we should have an APPID

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    Yeah,... I was typing along and thinking, I don't normally have to do all this. ;)

    As a basic example, it's probably okay. If you were just starting out I can see why Bob would use it.

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    @BobTabor how can I indent gauge in this application, is there any library?

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