界面：
1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> 2 3 <!DOCTYPE html> 4 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head runat="server"> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 8 <title></title> 9 <style type="text/css"> 10 #Image1 { 11 500px; 12 } 13 </style> 14 </head> 15 <body> 16 <form id="form1" runat="server"> 17 <div> 18 <asp:FileUpload ID="FileUpload1" runat="server" /> 19 <asp:Button ID="Button1" runat="server" Text="上传" /> 20 <br /> 21 <asp:Image ID="Image1" runat="server" /> 22 </div> 23 </form> 24 </body> 25 </html>
后台：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using System.Web.UI; 6 using System.Web.UI.WebControls; 7 using System.Drawing; 8 9 public partial class _Default : System.Web.UI.Page 10 { 11 protected void Page_Load(object sender, EventArgs e) 12 { 13 Button1.Click += Button1_Click; 14 } 15 16 void Button1_Click(object sender, EventArgs e) 17 { 18 //画布 19 System.Drawing.Image img = System.Drawing.Image.FromStream(FileUpload1.FileContent); 20 21 Graphics g = Graphics.FromImage(img); 22 //水印内容 23 string s = "汉企奇点网络0928"; 24 Font f = new Font("微软雅黑",20);//字体 25 Brush b = new SolidBrush(Color.Red);//颜色 26 //所在画布位置 27 PointF p = new PointF(20,20); 28 PointF p1 = new PointF(100, 100); 29 PointF p2 = new PointF(400, 100); 30 PointF p3 = new PointF(250, 200); 31 32 g.DrawString(s, f, b, p); 33 g.DrawString(s, f, b, p1); 34 g.DrawString(s, f, b, p2); 35 g.DrawString(s, f, b, p3); 36 37 string sss = "images/"+DateTime.Now.ToString("yyyyMMddhhmmssms")+FileUpload1.FileName; 38 //保存位置 39 img.Save(Server.MapPath(sss)); 40 //显示图片 41 Image1.ImageUrl = sss; 42 } 43 }
