/// <summary>
/// 保存到指定路径
/// </summary>
/// <param name="httpResponse"></param>
/// <param name="filePath">文件路径和文件名</param>
/// <param name="cancellationToken">取消令牌</param>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="OperationCanceledException"></exception>
/// <returns></returns>
public static async Task SaveAsAsync(this HttpResponseMessage httpResponse, string filePath, CancellationToken cancellationToken = default)
{
if (string.IsNullOrEmpty(filePath) == true)
{
throw new ArgumentNullException(nameof(filePath));
}
var dir = Path.GetDirectoryName(filePath);
if (string.IsNullOrEmpty(dir) == false)
{
Directory.CreateDirectory(dir);
}
using var fileStream = File.OpenWrite(filePath);
await httpResponse.SaveAsAsync(fileStream, cancellationToken).ConfigureAwait(false);
}