C#之通过图片地址下载图片

因为项目上需要加载在线卫星云图，因此写了这个功能来把卫星云图下载的本地,在这里记录一下：

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”;

上面为图片地址和本地文件夹的设置。

接下来是图片下载相关代码：

                        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[];
                        int c = ; //实际读取的字节数
                        while ((c = reader.Read(buff, , buff.Length)) > )
                        {
                            writer.Write(buff, , c);
                        }
                        writer.Close();
                        writer.Dispose();
                        reader.Close();
                        reader.Dispose();
                        response.Close();