azure-search-blog-post-5.cs

public async Task<CollectionResult<PackageDto>> GetPackages(PackageSearchQuery query)
{
    if (!IsSearchServiceConfigured())
    {
        return CollectionResult<PackageDto>.Empty();
    }

    SearchClient searchClient = GetSearchClient();

    string searchText = GetSearchText(query);
    SearchOptions searchOptions = GetSearchOptions(query);

    Response<SearchResults<PackageModel>> resultsResponse;
    try
    {
        resultsResponse = await searchClient.SearchAsync<PackageModel>(searchText, searchOptions);
    }
    catch (RequestFailedException ex) when (ex.Message.StartsWith("If a query contains the search option the target index must contain one or more searchable string fields."))
    {
        // No fields defined on index (i.e. not yet populated).
        return CollectionResult<PackageDto>.Empty();
    }

    SearchResults<PackageModel> results = resultsResponse.Value;

    return CollectionResult<PackageDto>.FromResults(
        results.GetResults()
            .Select(x => x.Document.ToPackageDto(query)),
        results.TotalCount ?? 0);
}

private bool IsSearchServiceConfigured() => !string.IsNullOrWhiteSpace(_searchSettings.ServiceEndPoint);

private SearchClient GetSearchClient()
{
    if (string.IsNullOrEmpty(_searchSettings.QueryApiKey))
    {
        throw new InvalidOperationException($"Cannot create a search client operations as the query API key was not provided.");
    }

    return new SearchClient(new Uri(_searchSettings.ServiceEndPoint), _searchSettings.IndexName, new AzureKeyCredential(_searchSettings.QueryApiKey));
}

private static string GetSearchText(PackageSearchQuery query) => string.IsNullOrEmpty(query.Text) ? "*" : query.Text;

private static SearchOptions GetSearchOptions(PackageSearchQuery query)
{
    var options = new SearchOptions
    {
        IncludeTotalCount = true,
    };

    SelectFields(options, query);
    ApplyFilter(options, query);
    ApplyOrderBy(options, query);
    ApplyPaging(query, options);

    return options;
}