C#上传图片，生成缩略图，生成文字或图像水印图

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form >
        <div>
            &nbsp;
            <table>
                <tr>
                    <td style="width: 100px">
                        上传图片：</td>
                    <td style="width: 100px">
                        <asp:FileUpload ID="FileUpload1" runat="server" /></td>
                    <td style="width: 100px">
                        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" /></td>
                </tr>
                <tr>
                    <td style="width: 100px" valign="top">
                        原图：</td>
                    <td style="width: 100px">
                        <asp:Image ID="Image1" runat="server" /></td>
                    <td style="width: 100px">
                    </td>
                </tr>
                <tr>
                    <td style="width: 100px" valign="top">
                        缩略图：</td>
                    <td style="width: 100px">
                        <asp:Image ID="Image2" runat="server" /></td>
                    <td style="width: 100px">
                    </td>
                </tr>
                <tr>
                    <td style="width: 100px" valign="top">
                        加水印：</td>
                    <td style="width: 100px">
                        <asp:Image ID="Image3" runat="server" /></td>
                    <td style="width: 100px">
                    </td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string filename = FileUpload1.FileName;
string nowpath = Server.MapPath(".") + "\\";
filename = nowpath + filename;
//保存原图
FileUpload1.SaveAs(filename);
System.Drawing.Image image, newimage, syimage;
System.Drawing.Image.GetThumbnailImageAbort callb = null;
image = System.Drawing.Image.FromFile(filename);
syimage = System.Drawing.Image.FromFile(Server.MapPath(".") + "\\" + "缩略图.gif");//要目录下放一个"缩略图.gif"文件,可以从网上下载：http://www.baidu.com/img/baidu.gif
//保存缩略图
newimage = image.GetThumbnailImage(100, 100, callb, new IntPtr());
newimage.Save(filename + ".缩略图.png");
newimage.Dispose();
//处理原图片
Graphics g = Graphics.FromImage(image);
Font f = new Font("隶书", 16);
Brush b = new SolidBrush(ColorTranslator.FromHtml("#FF0000"));
string addText = "文字水印内容";
g.DrawString(addText, f, b, 10, 10);
g.DrawImageUnscaled(syimage, 50, 50);
//g.DrawImage(newimage,50,50,100,100);
g.Dispose();
//生成水印图
image.Save(filename + ".水印.png");
image.Dispose();
syimage.Dispose();
Image1.ImageUrl = FileUpload1.FileName;
Image2.ImageUrl = FileUpload1.FileName + ".缩略图.png";
Image3.ImageUrl = FileUpload1.FileName + ".水印.png";
}
}