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string mapho = request["imgpath"];//»ñȡij¸öÒ³Ãæ´«¹ýµÄͼƬÃû³Æ
string str1 = Server.MapPath(mapho);//ÒªÌí¼ÓˮӡµÄͼƬ
string str2 = Server.MapPath("WaterMark.jpg");//Ìí¼ÓµÄÄÚÈÝͼƬ
System.Drawing.Image bmp = System.Drawing.Image.fromFile(str1);
Graphics gs = Graphics.fromImage(bmp);
System.Drawing.Image bmp2 = System.Drawing.Image.fromFile(str2);
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gs.DrawImage(bmp2, bmp.Width-bmp2.Width, bmp.Height - bmp2.Height, bmp2.Width, bmp2.Height);
Response.ContentType = "image/jpeg";//Êä³öÀàÐÍ
bmp.Save(Response.OutputStream,ImageFormat.Jpeg);//±£´æ
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//using System.Web.Security;
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