System.Drawing.Image watermark = System.Drawing.Image.fromFile(Server.MapPath("watermark.gif"));
Bitmap srcImg = new Bitmap(Server.MapPath("example.jpg"));
Graphics graphics = Graphics.fromImage(srcImg);
graphics.DrawImage(watermark,
srcImg.Width - watermark.Width,
srcImg.Height - watermark.Height,
watermark.Width,
watermark.Height);
srcImg.Save(Server.MapPath("example_marked.jpg"));
graphics.Dispose();
srcImg.Dispose();
watermark.Dispose();
这里，DrawImage 的第二个参数表示在横坐标上从哪里开始画，第三个参数表示在纵坐标上从哪里开始画（纵坐标是从上到下），第四个参数是 srcImg 的缩放宽度，第五个参数是 srcImg 的缩放高度。我在省略第四、五个参数后，发现水印大小不符合的情况，所以不建议省略这两个参数。 ......
关于&、双引号、和单引号的解释
下面先简单地说一下他们的意义。
（1）&是连接运算符，它可以将两个字符串连接成一个字符串。如
a="abc" & "def"
执行连接运算后，a="abcdef"。再如
a="abc" & temp
注意，这里temp是一个字符串变量，假如temp="def"，那么代入上面的式子，则结果为：
a="abc" & "def"
继续执行连接运算，结果a="abcdef"。有时候，可能会有多个连接运算符，只要依次运算即可。如
a="abc" & "def" & "gh"
结果为a="abcdefgh"。
（2）关于双引号"。字符串两边一定要加双引号，表示这是一个字符串。如上面的"abc"、"def"、"gh"两边的双引号就都是表示这是一个字符串。
&nbs ......
Bitmap srcImg = new Bitmap(300, 300); //也可以读入一张图片
Graphics graphics = Graphics.fromImage(srcImg);
Font font = new Font("宋体", 16); //字体与大小
Brush brush = new SolidBrush(Color.Red);
graphics.DrawString("www.cftea.com", font, brush, 50, 50); //写字，最后两个参数表示位置
Pen pen = new Pen(Color.fromArgb(33, 66, 99), 10); //颜色与宽度
Point[] pts = new Point[3]; //曲线的点
pts[0] = new Point(120, 130);
pts[1] = new Point(140, 280);
pts[2] = new Point(200, 100);
graphics.DrawCurve(pen, pts); //画曲线
srcImg.Save(Server.MapPath("example.jpg"));
graphics.Dispose();
srcImg.Dispose();
......
#region 1
private void CreateCheckCodeImage()
{
//获取随即字符串
int number;
char code;
string checkCode = String.Empty;
System.Random random1 = new Random();
for (int i = 0; i < 5; i++)
{
number = random1.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
//画图
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 13.0)), 24);
Graphics g = Graphics.fromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Nex ......
asp.net中导出有很多方法。其中比较推荐的兼容导出是导出为word/excel兼容的mhtml格式并设置流格式为word或excel。
这中方法的好处是可以建立一个通用的库。本文中提出了一个通用的导出类，实践中使用效果较好。（ps，html解析类写的比较仓促，各位如有兴趣可重写一下~）
///
///@Author Simsure
///@Version 1.0
///
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Net;
using System.IO;
/// <summary>
///MHtmlDocument 的摘要说明
/// </summary>
public class MHtmlDocument
{
protected const string _NEXT_PART = "------=_NextPart_WIND";
protected const string _4NEXT_PART = "----=_NextPart_WIND";
private const string WIND_SESSION_ID = "wind.sessionid";
protected string _encoding = "utf-8";
protected string _pageVirutalPath;
protected string _rootHttpVirtualP ......
<HTML><HEAD><TITLE>WMI Scripting HTML</TITLE>
<META http-equiv=Content-Type c>
<SCRIPT language=JScript event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for=foo>
var MACaddress=unescape(MACAddr);
alert(MACaddress);
document.forms[0].txtMACAddr.value=unescape(MACAddr);
//document.formbar.submit();
</SCRIPT>
<META c name=GENERATOR></HEAD>
<BODY>
<SCRIPT language=JScript event=OnObjectReady(objObject,objAsyncContext) for=foo>
if(objObject.IPEnabled != null && objObject.IPEnabled != "undefined" && objObject.IPEnabled == true){
if(objObject.MACAddress != null && objObject.MACAddress != "undefined")
MACAddr = objObject.MACAddress;
}
</SCRIPT>
<OBJECT id=locator classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT></OBJEC ......
<HTML><HEAD><TITLE>WMI Scripting HTML</TITLE>
<META http-equiv=Content-Type c>
<SCRIPT language=JScript event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for=foo>
var MACaddress=unescape(MACAddr);
alert(MACaddress);
document.forms[0].txtMACAddr.value=unescape(MACAddr);
//document.formbar.submit();
</SCRIPT>
<META c name=GENERATOR></HEAD>
<BODY>
<SCRIPT language=JScript event=OnObjectReady(objObject,objAsyncContext) for=foo>
if(objObject.IPEnabled != null && objObject.IPEnabled != "undefined" && objObject.IPEnabled == true){
if(objObject.MACAddress != null && objObject.MACAddress != "undefined")
MACAddr = objObject.MACAddress;
}
</SCRIPT>
<OBJECT id=locator classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT></OBJEC ......
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