public async Task <Stream> DownloadAsync(FilesDownloadModel input, CancellationToken token = default)
{
if (string.IsNullOrEmpty(input.FileName) || !(input.Files?.Count > 0))
{
throw new ArgumentException("参数无效");
}
var response = await _httpClient.PostAsync(FileStorageOption.DownloadUrl,
new StringContent(JsonConvert.SerializeObject(input),
Encoding.UTF8,
"application/json"),
token);
if (response.IsSuccessStatusCode)
{
return(await response.Content.ReadAsStreamAsync());
}
throw new HttpRequestException($"下载文件失败，{response.StatusCode}: {await response.Content.ReadAsStringAsync()}");
}
public static async Task DownloadToFileAsync(this IFileStorage storage, string output, FilesDownloadModel input,
CancellationToken token = default)
{
using (var stream = await storage.DownloadAsync(input, token))
{
using (var writer = File.Open(output, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
writer.SetLength(0);
writer.Seek(0, SeekOrigin.Begin);
await stream.CopyToAsync(writer, 4096, token);
}
}
}