Webform 上传图片加水印

时间：2024-12-04 18:33:38

界面：

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head runat="server">

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

     <title></title>

     <style type="text/css">

         #Image1 {

             width: 500px;

         }

     </style>

 </head>

 <body>

     <form id="form1" runat="server">

         <div>

             <asp:FileUpload ID="FileUpload1" runat="server" />

             <asp:Button ID="Button1" runat="server" Text="上传" />

             <br />

             <asp:Image ID="Image1" runat="server" />

         </div>

     </form>

 </body>

 </html>

界面

后台：

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Web.UI;

 using System.Web.UI.WebControls;

 using System.Drawing;

 public partial class _Default : System.Web.UI.Page

 {

     protected void Page_Load(object sender, EventArgs e)

     {

         Button1.Click += Button1_Click;

     }

     void Button1_Click(object sender, EventArgs e)

     {

         //画布

         System.Drawing.Image img = System.Drawing.Image.FromStream(FileUpload1.FileContent);

         Graphics g = Graphics.FromImage(img);

         //水印内容

         string s = "汉企奇点网络0928";

         Font f = new Font("微软雅黑",);//字体

         Brush b = new SolidBrush(Color.Red);//颜色

         //所在画布位置

         PointF p = new PointF(,);

         PointF p1 = new PointF(, );

         PointF p2 = new PointF(, );

         PointF p3 = new PointF(, );

         g.DrawString(s, f, b, p);

         g.DrawString(s, f, b, p1);

         g.DrawString(s, f, b, p2);

         g.DrawString(s, f, b, p3);

         string sss = "images/"+DateTime.Now.ToString("yyyyMMddhhmmssms")+FileUpload1.FileName;

         //保存位置

         img.Save(Server.MapPath(sss));

         //显示图片

         Image1.ImageUrl = sss;

     }

 }

后台：

Webform 上传图片加水印

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