azure-search-blog-post-2.cs

public async Task<bool> AddOrUpdatePackage(PackageDto packageDto)
{
    if (!IsSearchServiceConfigured())
    {
        _logger.LogWarning($"Package with Id {packageDto.PackageId} failed to index with Azure search as the search service is not configured.");
        return false;
    }

    SearchIndexClient indexClient = GetIndexClient();
    await CreateIndexIfNotExists(indexClient);

    ...
}

private SearchIndexClient GetIndexClient()
{
    if (string.IsNullOrEmpty(_searchSettings.AdminApiKey))
    {
        throw new InvalidOperationException($"Cannot create a search index client operations as the admin API key was not provided.");
    }

    return new SearchIndexClient(new Uri(_searchSettings.ServiceEndPoint), new AzureKeyCredential(_searchSettings.AdminApiKey));
}

private async Task CreateIndexIfNotExists(SearchIndexClient indexClient)
{
    // Note that we can't update fields that already exist, so it's not feasible to use CreateOrUpdateIndexAsync() here.
    // Rather, if fields are changed, we need to rebuild the index.
    try
    {
        Response<SearchIndex> existingIndexResponse = await indexClient.GetIndexAsync(_searchSettings.IndexName);
        return;
    }
    catch (RequestFailedException e) when (e.Status == 404)
    {
        await CreateIndex(indexClient);
    }       
}

private async Task CreateIndex(SearchIndexClient indexClient)
{
    var fieldBuilder = new FieldBuilder();
    IList<SearchField> searchFields = fieldBuilder.Build(typeof(PackageModel));

    var definition = new SearchIndex(_searchSettings.IndexName, searchFields);

    await indexClient.CreateIndexAsync(definition);
}