protected async Task LoadData()
{
// Try loading the results, show error message if necessary.
WebResultsList webResults = null;
Boolean error = false;
try
{
webResults = await GetQueryResults();
}
catch
{
error = true;
}
// Hide the spinner, show the table
LoadingIndicator.IsVisible = false;
LoadingIndicator.IsRunning = false;
DataTable.IsVisible = true;
if (error)
{
await ErrorAndPop("Error", "Error fetching results", "OK");
}
else if (webResults?.totalEstimatedMatches > 0)
{
values = webResults.value;
DataTable.ItemsSource = values;
}
else
{
await ErrorAndPop("Error", "No results found", "OK");;
}
}
async Task <WebResultsList> GetQueryResults()
{
// URL-encode the query term
var queryString = System.Net.WebUtility.UrlEncode(queryTerm);
// Here we encode the URL that will be used for the GET request to
// find query results. Its arguments are as follows:
//
// - [count=20] This sets the number of webpage objects returned at
// "$.webpages" in the JSON response. Currently, the API aks for
// 20 webpages in the response
//
// - [mkt=en-US] This sets the market where the results come from.
// Currently, the API looks for english results based in the
// United States.
//
// - [q=queryString] This sets the string queried using the Search
// API.
//
// - [responseFilter=Webpages] This filters the response to only
// include Webpage results. This tag can take a comma seperated
// list of response types that you are looking for. If left
// blank, all responses (webPages, News, Videos, etc) are
// returned.
//
// - [setLang=en] This sets the languge for user interface strings.
// To learn more about UI strings, check the Web Search API
// reference.
//
// - [API Reference] https://docs.microsoft.com/en-us/rest/api/cognitiveservices/bing-web-api-v5-reference
string uri = AppConstants.BingWebSearchApiUrl + $"count=20&mkt=en-US&q={queryString}&responseFilter=Webpages&setLang=en";
// Make the HTTP Request
WebResultsList webResults = null;
HttpResponseMessage httpResponseMessage = await searchApiClient.GetAsync(uri);
var responseContentString = await httpResponseMessage.Content.ReadAsStringAsync();
JObject json = JObject.Parse(responseContentString);
JToken resultBlock = json.SelectToken("$.webPages");
if (resultBlock != null)
{
webResults = JsonConvert.DeserializeObject <WebResultsList>(resultBlock.ToString());
}
return(webResults);
}
