因为图片来源多种多样,默认框架已经提供了好几种图片读取方式,比如Image.FromFile,Image.FromHbitmap,Image.FromStream,但就是没有提供Image.FromNet,所以这里写了个通用的扩展方法,可以支持从Net环境中读取图片(Http、Ftp等),因为只是个扩展,也没啥好说的,直接上代码就是
using System.Drawing; using System.Net; public static class ImageExtensions { /// <summary> /// 通过NET获取网络图片 /// </summary> /// <param name="url">要访问的图片所在网址</param> /// <param name="requestAction">对于WebRequest需要进行的一些处理,比如代理、密码之类</param> /// <param name="responseFunc">如何从WebResponse中获取到图片</param> /// <returns></returns> public static Image GetImageFromNet(this string url, Action<WebRequest> requestAction = null, Func<WebResponse, Image> responseFunc = null) { return new Uri(url).GetImageFromNet(requestAction, responseFunc); } /// <summary> /// 通过NET获取网络图片 /// </summary> /// <param name="url">要访问的图片所在网址</param> /// <param name="requestAction">对于WebRequest需要进行的一些处理,比如代理、密码之类</param> /// <param name="responseFunc">如何从WebResponse中获取到图片</param> /// <returns></returns> public static Image GetImageFromNet(this Uri url, Action<WebRequest> requestAction = null, Func<WebResponse, Image> responseFunc = null) { Image img; try { WebRequest request = WebRequest.Create(url); if (requestAction != null) { requestAction(request); } using (WebResponse response = request.GetResponse()) { if (responseFunc != null) { img = responseFunc(response); } else { img = Image.FromStream(response.GetResponseStream()); } } } catch { img = null; } return img; } }调用方法就是
var uri = "http://t1.mmonly.cc/uploads/allimg/tuku2/16343123c-11.jpg"; //var uri = new Uri("http://t1.mmonly.cc/uploads/allimg/tuku2/16343123c-11.jpg"); var img = uri.GetImageFromNet( //(request) => //{//此处可以对request进行相关设定,因为此部分均为基类,所以也可以用于FtpWebRequest之类 // request.Timeout = 2000; //}, //(response) => //{//此处可以确定如何从response中获取图片,同时可以包括相关判断之类 // return Image.FromStream(response.GetResponseStream()); //} );
原文地址:http://blog.csdn.net/starfd/article/details/45840853