C# pictureBox.Image获得图片的三种方法

1.绝对路径: 
this.pictureBox.Image=Image.FromFile("C:\\test.jpg"); 
 
2.相对路径: 
Application.StartupPath;  
可以得到程序根目录  
this.pictureBox.Image=Image.FromFile(Application.StartupPath "\\test.jpg"); 
 
3.获得网络图片的路径 
string url="http://img.zcool.cn/community/01635d571ed29832f875a3994c7836.png@900w_1l_2o_100sh.jpg";
this.pictureBox.Image= Image.FromStream(System.Net.WebRequest.Create(url).GetResponse().GetResponseStream());