C#之通过图片地址下载图片

string imageUrl=“http://image.nmc.cn/product/2018/08/06/WXCL/SEVP_NSMC_WXCL_ASC_E99_ACHN_LNO_PY_20180806051500000.JPG?v=1533532726321”;

string _ImagePath = AppDomain.CurrentDomain.BaseDirectory + "Resources\\CloudImages\\"+“test.JPG”;

                        HttpWebRequest request = HttpWebRequest.Create(imageUrl) as HttpWebRequest;
                        HttpWebResponse response = null;
                        response = request.GetResponse() as HttpWebResponse;if (response.StatusCode != HttpStatusCode.OK) continue;
                        Stream reader = response.GetResponseStream();
                        FileStream writer = new FileStream(_ImagePath, FileMode.OpenOrCreate, FileAccess.Write);
                        byte[] buff = new byte[512];
                        int c = 0; //实际读取的字节数
                        while ((c = reader.Read(buff, 0, buff.Length)) > 0)
                        {
                            writer.Write(buff, 0, c);
                        }
                        writer.Close();
                        writer.Dispose();
                        reader.Close();
                        reader.Dispose();
                        response.Close();