请帮助查找并下载如何使用c#从谷歌搜索下载全尺寸图像
public void SaveImage(string filename, ImageFormat format) {
WebClient client = new WebClient();
Stream stream = client.OpenRead(imageUrl);
Bitmap bitmap; bitmap = new Bitmap(stream);
if (bitmap != null)
bitmap.Save(filename, format);
stream.Flush();
stream.Close();
client.Dispose();
}