从JPG中获取缩略图
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Net; using System.IO; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { } protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { string p = "s.JPG"; Image i = Image.FromFile ( p ); Image tn = i.GetThumbnailImage(50, 50, null, IntPtr.Zero); // <=>(IntPtr)0 e.Graphics.DrawImage(tn, 100, 0, tn.Width, tn.Height); e.Graphics.Dispose(); } } }