Webform 上传图片加水印

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             width: 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>
界面

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 }
后台：

 

posted @ 2017-01-06 15:28  浆糊033  阅读(171)  评论(0)  编辑  收藏  举报