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string src = Server.MapPath("/imge/" + "002001.tif");//路径
System.Drawing.Image image = System.Drawing.Image.FromFile(src);
//src是原来的图片的路径
System.Drawing.Image aNewImage = image.GetThumbnailImage(611, 369, null, new System.IntPtr());
//iWidth,iHeight是你想要得新的图片的宽度和高度
aNewImage.Save(Server.MapPath("/imge/" + "002001new.jpg"));
//fileName是新的图片的文件名
image.Dispose();
<body>
<form id="form1" runat="server">
<div>
<img id="img1" alt="" src="imge/002001new.jpg" />
</div>
</form>
</body>