最近在做一個c#圖片預覽，整理了讀取圖片給picturebox

1.絕對路徑: 
this.pictureBox.Image=Image.FromFile("C:\\test.jpg"); 

2.相對路徑: 
Application.StartupPath;  
可以得到程式根目錄  
this.pictureBox.Image=Image.FromFile(Application.StartupPath "\\test.jpg"); 

3.獲得網路圖片的路徑 

string url="http://img.zcool.cn/community/[email protected]_1l_2o_100sh.jpg";
this.pictureBox.Image= Image.FromStream(System.Net.WebRequest.Create(url).GetResponse().GetResponseStream());