Currently, I'm developing a Windows Phone 8.0 application that displays some 100 GPS locations on a map. The GPS data is obtained by calling a RESTful webservice as follows:
public async Task<string> GetWebContent(string uri)
{
string result = null;
using (var client = new HttpClient())
{
result = await client.GetStringAsync(new Uri(uri));
}
return result;
}
Here, the HttpClient is taken from the Nuget Package "Microsoft HTTP Client Libraries".
The first time the code is called, data is obtained and the GPS locations are nicely plotted on a map. However, since the GPS devices move constantly, I have to refresh the data every 30 seconds. This is where I hit the wall; the data contained in the variable "result" never changes. Even after several minutes the data is the same. The raw data contain a datetime property, which clearly tells me that the data is old and not just the GPS devices standing still. If I paste the uri into a webbrowser, and hit the refresh butten every 15 sec, the data does changed hence the webservice is working properly.
Since the HttpClient is contained in a using-statement, it is disposed off every time and some hidden caching mechanism seems impossible. So, does anyone have an idea?
cheers
Update
I tried using Fiddler, but had to follow a lengthy instruction to make it connect with the emulator. Once done, nothing worked anymore :-s Reverting all the certificates that Fiddler installed and copied the code to a regular WPF application and there it works als a charm.I'm no closer to an understanding of what's going on, but the problem seems to be related to the fact that it's a windows phone project.
