通过url获取图片，把图片保存在sql server中

小时？

　　WebRequest myrequest = WebRequest.Create(CompanyLogoUrl);
　　using (HttpWebResponse response = myrequest.GetResponse() as HttpWebResponse)
　　{
　　if (response.StatusCode == HttpStatusCode.OK)
　　{
　　Stream rs = response.GetResponseStream();//rs.Length 此流不支持查找,先转为MemoryStream
　　var ms = StreamToMemoryStream(rs);
　　ms.Seek(0, SeekOrigin.Begin);
　　int buffsize = (int)ms.Length;
　　byte[] bytes = new byte[buffsize];
　　ms.Read(bytes, 0, buffsize);
　　string strPictureType = Path.GetExtension(CompanyLogoUrl).Substring(1);//图片类型   
　　var supportedTypes = new[] { "pjpeg", "jpeg", "jpg", "gif", "png" };//{ "pjpeg", "jpeg", "jpg", "gif", "bmp", "png" }
　　if (supportedTypes.Contains(strPictureType, StringComparer.OrdinalIgnoreCase))
　　{
　　if (buffsize != 0 && buffsize <= 512000)
　　{
　　string fileName = Path.GetFileName(CompanyLogoUrl);
　　string fileID = ServiceFactory.GetFileCenterService().SaveFile(fileName, bytes);//保存在数据库方法
　　string path = ConfigrationHelper.FileCenterDomain + "/Home/GetFile/" + fileID;
　　result = path + "$" + fileName;
　　}
　　}
　　ms.Flush(); ms.Close();
　　rs.Flush(); rs.Close();
　　}
　　}
　　protected MemoryStream StreamToMemoryStream(Stream instream)
　　{
　　MemoryStream outstream = new MemoryStream();
　　int bufferLen = 512000;//图片大小限制
　　byte[] buffer = new byte[bufferLen];
　　int count = 0;
　　while ((count = instream.Read(buffer, 0, bufferLen)) > 0)
　　{
　　outstream.Write(buffer, 0, count);
　　}
　　return outstream;
　　}