本文實(shí)例講述了ASP.NET實(shí)現(xiàn)根據(jù)URL生成網(wǎng)頁(yè)縮略圖的方法。分享給大家供大家參考，具體如下：
工作中需要用到根據(jù)URL生成網(wǎng)頁(yè)縮略圖功能，提前做好準(zhǔn)備。
在網(wǎng)上找了份源碼，但是有錯(cuò)誤:當(dāng)前線程不在單線程單元中，因此無(wú)法實(shí)例化 ActiveX 控件“8856f961-340a-11d0-a9”，解決后運(yùn)行良好，記錄在此備用！
起始頁(yè)：Default.aspx
%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CaptureToImage._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 id="Head1" runat="server">
title>Snap/title>
/head>
body>
form id="form1" runat="server">
div>
input type="button" onclick="window.open('Snap.aspx?url=www.njude.com.cn')" value="生成網(wǎng)頁(yè)縮略圖"/>
/div>
/form>
/body>
/html>
調(diào)用頁(yè)：Snap.aspx
%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Snap.aspx.cs" Inherits="CaptureToImage.Snap" AspCompat="true" %>
!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>無(wú)標(biāo)題頁(yè)/title>
/head>
body>
form id="form1" runat="server">
div>
/div>
/form>
/body>
/html>
PS：紅色字體部分是為解決錯(cuò)誤增加的代碼，強(qiáng)制程序在單線程環(huán)境下運(yùn)行！
調(diào)用頁(yè)：Snap.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Imaging;
namespace CaptureToImage
{
public partial class Snap : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string url = string.Empty;
url = Request.QueryString[0];
try
{
GetImage thumb = new GetImage(url, 1024, 768, 800, 600);
System.Drawing.Bitmap x = thumb.GetBitmap();
x.Save(Response.OutputStream, ImageFormat.Jpeg);
Response.ContentType = "image/jpeg";
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
}
}
類文件：GetImage.cs
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Web.UI;
namespace CaptureToImage
{
public class GetImage
{
int S_Height;
int S_Width;
int F_Height;
int F_Width;
string MyURL;
public int ScreenHeight
{
get
{
return S_Height;
}
set
{
S_Height = value;
}
}
public int ScreenWidth
{
get
{
return S_Width;
}
set
{
S_Width = value;
}
}
public int ImageHeight
{
get
{
return F_Height;
}
set
{
F_Height = value;
}
}
public int ImageWidth
{
get
{
return F_Width;
}
set
{
F_Width = value;
}
}
public string WebSite
{
get
{
return MyURL;
}
set
{
MyURL = value;
}
}
public GetImage(string WebSite, int ScreenWidth, int ScreenHeight, int ImageWidth, int ImageHeight)
{
this.WebSite = WebSite;
this.ScreenHeight = ScreenHeight;
this.ScreenWidth = ScreenWidth;
this.ImageHeight = ImageHeight;
this.ImageWidth = ImageWidth;
}
[STAThread]
public Bitmap GetBitmap()
{
WebPageBitmap Shot = new WebPageBitmap(this.WebSite, this.ScreenWidth, this.ScreenHeight);
Shot.GetIt();
Bitmap Pic = Shot.DrawBitmap(this.ImageHeight, this.ImageWidth);
return Pic;
}
}
public class WebPageBitmap
{
WebBrowser MyBrowser;
string URL;
int Height;
int Width;
public WebPageBitmap(string url, int width, int height)
{
this.URL = url;
this.Width = width;
this.Height = height;
MyBrowser = new WebBrowser();
MyBrowser.ScrollBarsEnabled = false;
MyBrowser.Size = new Size(this.Width, this.Height);
}
public void GetIt()
{
NavigateUrl(this.URL);
while (MyBrowser.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
}
public delegate void DelUserHandler(string url);
public void NavigateUrl(string url)
{
try
{
if (this.MyBrowser.InvokeRequired)
{
DelUserHandler handler = new DelUserHandler(NavigateUrl);
MyBrowser.Invoke(handler, url);
}
else
{
this.MyBrowser.Navigate(url);
}
}
catch (Exception ex)
{
throw new Exception("NavigateUrl()" + ex.Message);
}
}
public Bitmap DrawBitmap(int theight, int twidth)
{
Bitmap myBitmap = new Bitmap(this.Width, this.Height);
Rectangle DrawRect = new Rectangle(0, 0, this.Width, this.Height);
MyBrowser.DrawToBitmap(myBitmap, DrawRect);
System.Drawing.Image imgOutput = myBitmap;
System.Drawing.Bitmap oThumbNail = new Bitmap(twidth, theight, imgOutput.PixelFormat);
Graphics g = Graphics.FromImage(oThumbNail);
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
Rectangle oRectangle = new Rectangle(0, 0, twidth, theight);
g.DrawImage(imgOutput, oRectangle);
try
{
return oThumbNail;
}
catch
{
return null;
}
finally
{
imgOutput.Dispose();
imgOutput = null;
MyBrowser.Dispose();
MyBrowser = null;
}
}
}
}
PS：項(xiàng)目中需要添加引用System.Windows.Forms
希望本文所述對(duì)大家asp.net程序設(shè)計(jì)有所幫助。
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