private static async Task DownloadBingDailyImage(string saveDir)
{
var jsonHttpClient = BuildJsonHttpClient();
var metadataTask = jsonHttpClient.GetStringAsync($"{BaseUrl}/{ImageMetadataUrl}");
var metadataStr = await metadataTask;
var metadata = JsonSerializer.Deserialize <RootObject>(metadataStr, new JsonSerializerOptions {
PropertyNameCaseInsensitive = true
});
var imageHttpClient = BuildImageHttpClient();
if (metadata.Images.Length == 0)
{
return;
}
var cache = new StringCache(Path.Combine(CurrentExeDirectory, "cache.txt"));
cache.Load();
try
{
foreach (var metadataImage in metadata.Images)
{
var uri = new Uri(BaseUrl + metadataImage.Url);
var queryDictionary = HttpUtility.ParseQueryString(uri.Query);
var id = queryDictionary["id"];
if (cache.Contains(id))
{
continue;
}
var imgStream = await imageHttpClient.GetStreamAsync(uri);
var directoryInfo = Directory.CreateDirectory(saveDir);
await using var fileStream = File.Create(Path.Combine(directoryInfo.FullName, id));
await imgStream.CopyToAsync(fileStream);
cache.Add(id);
}
}
finally
{
cache.Flush();
}
}