图片水印 

<%@ 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>
</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>
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;   //上传按钮点击事件
    }

    //上传按钮点击事件
    void Button1_Click(object sender, EventArgs e)
    {
        //1、创建画布
        System.Drawing.Image img = System.Drawing.Image.FromStream(FileUpload1.FileContent);
        Graphics g = Graphics.FromImage(img);
        
        //2、选择画笔、颜色
        Brush b = new SolidBrush(Color.WhiteSmoke);

        //3、设置字体，大小
        Font f = new Font("黑体", 28);

        //4、编辑内容
        string s = "南娜官方网站";

        //5、绘画，设置位置  
        g.DrawString(s, f, b, 100, 100);

        //6、保存画好的图片
        string path="Default"+FileUpload1.FileName;
        img.Save(Server.MapPath(path));
        Image1.ImageUrl = path;
    }
}

 

posted @ 2016-10-27 21:39  庚xiao午  阅读(253)  评论(0)    收藏  举报