C#利用WebBrowser将网页保存为图片

本文主要来和大家介绍一种使用 C# 实现从 URL 获取网页并将其转换为图片的方法。通过 WebBrowser 控件加载指定 URL 的网页内容，调整其大小以适应整个网页，并利用 DrawToBitmap 方法将显示的内容导出为位图文件。支持 JPEG 和 PNG 两种格式。

以下是完整代码：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace UrlToImage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var browser = new WebBrowser {ScrollBarsEnabled = false, ScriptErroRSSuppressed = true};
            browser.Navigate("http://www.rc114.com/");
            browser.DocumentCompleted += webBrowser_DocumentCompleted;
        }

        private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            var browser = (WebBrowser) sender;
            if (browser.ReadyState == WebBrowserReadyState.Complete)
            {
                if (browser.Document != null)
                {
                    if (browser.Document.Body != null)
                    {
                        var height = browser.Document.Body.ScrollRectangle.Height;
                        var width = browser.Document.Body.ScrollRectangle.Width;
                        browser.Height = height;
                        browser.Width = width;
                        using (var bitmap = new Bitmap(width, height))
                        {
                            var rectangle = new Rectangle(0, 0, width, height);
                            browser.DrawToBitmap(bitmap, rectangle);
                            var dialog = new SaveFileDialog();
                            dialog.Filter = " JPEG (*.jpg)|*.jpg|PNG (*.png)|*.png ";
                            dialog.ShowDialog();
                            bitmap.Save(dialog.FileName);
                        }
                    }
                }
            }
        }
    }
}

方法补充

C#将网页内容转换成图片保存到本地( webbrowser 可应用于B/S结构中)

代码如下：

GetImage.cs 类

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
namespace SavehtmltoImageComm
{
    public class GetImage
    {
        private int S_Height;
        private int S_Width;
        private int F_Height;
        private int F_Width;
        private 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.ScreenWidth = ScreenWidth;
            this.ScreenHeight = ScreenHeight;
            this.ImageHeight = ImageHeight;
            this.ImageWidth = ImageWidth;
        }
        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;
        }
    }
}

WebPageBitmap.cs类

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Net;
using System.Runtime.InteropServices;
namespace SaveHtMLtoImageComm
{
 
    public struct Structpython_INTERNET_PROXY_INFO 
{ 
public int dwAccessType; 
public IntPtr proxy; 
public IntPtr proxyBypass; 
}; 
    public class WebPageBitmap
    {
        [DllImport("wininet.dll", SetLastError = true)]
        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);
        private void RefreshIESettings(string strProxy)
        {
            const int INTERNET_OPTION_PROXY = 38;
            const int INTERNET_OPEN_TYPE_PROXY = 3;
            Struct_INTERNET_PROXY_INFO struct_IPI;
            // Filling in structure 
            struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
            struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
            struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");
            // Allocating memory 
            IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));
            // Converting structure to IntPtr 
            Marshal.StructureToPtr(struct_IPI, intptrStruct, true);
            bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
        } 
        WebBrowser MyBrowser;
        string URL;
        int Height;
        int Width;
        
        public WebPageBitmap(string url, int width, int height)
     编程客栈   {
            RefreshIESettings("www.my400800.cn:80"); 
            this.Height = height;
            this.Width = wpythonidth;
            this.URL = url;
            MyBrowser = new WebBrowser();
            WebProxy proxy = new WebProxy("blog.my400800.cn", 8080);                                    //定義一個網關對象
         
        
           // MyBrowser. .Proxy = proxy;
            MyBrowser.ScrollBarsEnabled = false;
            MyBrowser.Size = new Size(this.Width, this.Height);
        }
        public void GetIt()
        {
            MyBrowser.Navigate(this.URL);
          
            while (MyBrowser.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }
        }
        public Bitmap DrawBitmap(int theight, int twidth)
        {
            Bitmap myBitmap = new Bitmap(Width, Height);
            Rectangle DrawRect = new Rectangle(0, 0, Width, Height);
            MyBrowser.DrawToBitmap(myBitmap, DrawRect);
            System.Drawing.Image imgOutput = myBitmap;
            System.Drawing.Image oThumbNail = new Bitmap(twidth, theight, imgOutput.PixelFormat);
            Graphics g = Graphics.FromImage(oThumbNail);
            g.CompositingQuality = CompositingQuality.HighSpeed;
            g.SmoothingMode = SmoothingMode.HighSpeed;
            g.InterpolationMode = InterpolationMode.HighQualityBilinear;
            Rectangle oRectangle = new Rectangle(0, 0, twidth, theight);
            g.DrawImage(imgOutput, oRectangle);
            try
            {
                return (Bitmap)oThumbNail;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                imgOutput.Dispose();
                imgOutput = null;
                MyBrowser.Dispose();
                MyBrowser = null;
            }
        }
    }
}

main.cs类

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Threading;
using System.pythonWeb.UI;
namespace SaveHtMLtoImageComm
{
  public  class main
    {
      public string strURl = "";
      public string strImgFileName = "";
      public Page Context = null;
      public void startImg() {
          string url = strURl;
          //GetImage thumb = new GetImage(url, 1024, 4000, 1024, 4000);
          GetImage thumb = new GetImage(url, 1024, 1024, 1024, 1024);
          System.Drawing.Bitmap x = thumb.GetBitmap();
          //string FileName = DateTime.Now.ToString("yyyyMMddhhmmss");
          x.Save(Context.Server.MapPath("~") + @"/image/" + strImgFileName);// FileName + ".jpg");
      }
      
    }
}

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