C#读取图片的方法--学习笔记

总结下分别读取这两种数据来源的方法：

1、磁盘：

　　System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

2、内存中的数据流Stream：

　　System.Drawing.Image originalImage = System.Drawing.Image.FromStream(originalImageStream);

3、网络：

　　HttpWebRequest request = (HttpWebRequest)WebRequest.Create(originalImagePath);
      request.UserAgent = "MOZILLA/4.0 (COMPATIBLE; MSIE 7.0; WINDOWS NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
      request.Method = "GET";

　　HttpWebResponse response = (HttpWebResponse)request.GetResponse();

　　System.Drawing.Image originalImage = System.Drawing.Image.FromStream(response.GetResponseStream());