asp.net為圖片加上水印

test.aspx.cs

=============================

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class test : System.Web.UI.Page
{

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!Page.IsPostBack)
{
Image1.ImageUrl="e:/web/net/images/toqq.gif";
}
}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Button1_Click(object sender, System.EventArgs e)
{
if(File1.PostedFile.FileName.Trim()!="")
{
//上传文件
string extension = Path.GetExtension(File1.PostedFile.FileName).ToLower();
string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
string path = Server.MapPath(".") + "/upload/" + fileName + extension;
File1.PostedFile.SaveAs(path);

//加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
    //分解gif圖片為多個楨
//System.Drawing.Image image = System.Drawing.Image.FromFile(path);

//Image myImg = Image.FromFile(@"d:/test.gif");
//System.Drawing.Imaging.FrameDimension ImgFrmDim = new System.Drawing.Imaging.FrameDimension(myImg.FrameDimensionsList[0]);
//int nooffrm = myImg.GetFrameCount(ImgFrmDim);

//for (int i = 0; i < nooffrm; i++)
//{
//    myImg.SelectActiveFrame(ImgFrmDim, i);
//    myImg.Save(string.Format(@"d:/Frame{0}.jpg", i), ImageFormat.Jpeg);
//}  

Graphics g = Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
Font f = new Font("Verdana",16);
Brush b = new SolidBrush(Color.Blue);
string addText = "http://blog.youkuaiyun.com/jackeyabc";
g.DrawString(addText, f, b, 10, 10);
g.Dispose();

//保存加水印过后的图片,删除原始图片
string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
image.Save(newPath);
image.Dispose();
if(File.Exists(path))
{
File.Delete(path);
}

Image1.ImageUrl=newPath;
// Response.Redirect(newPath);
}

}

private void Button2_Click(object sender, System.EventArgs e)
{
//上传文件
string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
string fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
string path = Server.MapPath(".") + "/upload/" + fileName + extension;
File1.PostedFile.SaveAs(path);

//加图片水印
System.Drawing.Image image = System.Drawing.Image.FromFile(path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath(".") + "//2.jpg");
Graphics g = Graphics.FromImage(image);
g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height,

copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
g.Dispose();

//保存加水印过后的图片,删除原始图片
string newPath = Server.MapPath(".") + "/upload/" + fileName + "_new" + extension;
image.Save(newPath);
image.Dispose();
if(File.Exists(path))
{
File.Delete(path);
}

Image1.ImageUrl=newPath;
}
}

 

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test.aspx

==============================

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>blog.youkuaiyun.com/jackeyabc</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<INPUT id="File1" style="Z-INDEX: 101; LEFT: 144px; WIDTH: 400px; POSITION: absolute; TOP: 88px;

HEIGHT: 22px"
type="file" size="47" name="File1" runat="server">
<asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 176px; POSITION: absolute; TOP: 136px"

runat="server"
Text="上&#20256;并加文字水印"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 103; LEFT: 352px; POSITION: absolute; TOP: 136px"

runat="server"
Text="上&#20256;并加&#22270;片水印"></asp:Button>
<asp:RequiredFieldValidator id="RequiredFieldValidator1" style="Z-INDEX: 104; LEFT: 552px; POSITION:

absolute; TOP: 88px"
runat="server" ErrorMessage="*" ControlToValidate="File1"></asp:RequiredFieldValidator>
<DIV style="Z-INDEX: 105; LEFT: 16px; WIDTH: 100%; POSITION: absolute; TOP: 168px; HEIGHT: 100px"
ms_positioning="GridLayout">
<asp:Image  ImageUrl="e:/web/net/images/toqq.gif" id="Image1" style="Z-INDEX: 107; LEFT: 56px; POSITION: absolute; TOP: 16px"

runat="server"
ImageAlign="Middle"></asp:Image></DIV>
<asp:Label id="Label1" style="Z-INDEX: 107; LEFT: 176px; POSITION: absolute; TOP: 40px"

runat="server">51aspx－上&#20256;&#22270;片并加入水印</asp:Label>
</form>
</body>
</HTML>