将网页捕获为c#中的图像，确保javascript渲染的元素可见

您可能已经尝试过IECapt。我认为这是正确的做法。我创建了它的修改版本，并使用timer而不是Thread.Sleep，它可以按预期捕获您的网站。

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这是丑陋的来源。只需添加对Microsoft HTML Object Library的引用。

这就是用法：

HtmlCapture capture = new HtmlCapture(@"c:'temp'myimg.png");
capture.HtmlImageCapture += new HtmlCapture.HtmlCaptureEvent(capture_HtmlImageCapture);
capture.Create("http://www.highcharts.com/demo/combo-dual-axes");
void capture_HtmlImageCapture(object sender, Uri url)
{
    this.Close();
}

File1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace MyIECapt
{
    public class HtmlCapture
    {
        private WebBrowser web;
        private Timer tready;
        private Rectangle screen;
        private Size? imgsize = null;
        //an event that triggers when the html document is captured
        public delegate void HtmlCaptureEvent(object sender, Uri url);
        public event HtmlCaptureEvent HtmlImageCapture;
        string fileName = "";
        //class constructor
        public HtmlCapture(string fileName)
        {
            this.fileName = fileName;
            //initialise the webbrowser and the timer
            web = new WebBrowser();
            tready = new Timer();
            tready.Interval = 2000;
            screen = Screen.PrimaryScreen.Bounds;
            //set the webbrowser width and hight
            web.Width = 1024; //screen.Width;
            web.Height = 768; // screen.Height;
            //suppress script errors and hide scroll bars
            web.ScriptErrorsSuppressed = true;
            web.ScrollBarsEnabled = false;
            //attached events
            web.Navigating +=
              new WebBrowserNavigatingEventHandler(web_Navigating);
            web.DocumentCompleted += new
              WebBrowserDocumentCompletedEventHandler(web_DocumentCompleted);
            tready.Tick += new EventHandler(tready_Tick);
        }

        public void Create(string url)
        {
            imgsize = null;
            web.Navigate(url);
        }
        public void Create(string url, Size imgsz)
        {
            this.imgsize = imgsz;
            web.Navigate(url);
        }

        void web_DocumentCompleted(object sender,
                 WebBrowserDocumentCompletedEventArgs e)
        {
            //start the timer
            tready.Start();
        }
        void web_Navigating(object sender, WebBrowserNavigatingEventArgs e)
        {
            //stop the timer   
            tready.Stop();
        }

        void tready_Tick(object sender, EventArgs e)
        {
            try
            {
                //stop the timer
                tready.Stop();
                mshtml.IHTMLDocument2 docs2 = (mshtml.IHTMLDocument2)web.Document.DomDocument;
                mshtml.IHTMLDocument3 docs3 = (mshtml.IHTMLDocument3)web.Document.DomDocument;
                mshtml.IHTMLElement2 body2 = (mshtml.IHTMLElement2)docs2.body;
                mshtml.IHTMLElement2 root2 = (mshtml.IHTMLElement2)docs3.documentElement;
                // Determine dimensions for the image; we could add minWidth here
                // to ensure that we get closer to the minimal width (the width
                // computed might be a few pixels less than what we want).
                int width = Math.Max(body2.scrollWidth, root2.scrollWidth);
                int height = Math.Max(root2.scrollHeight, body2.scrollHeight);
                //get the size of the document's body
                Rectangle docRectangle = new Rectangle(0, 0, width, height);
                web.Width = docRectangle.Width;
                web.Height = docRectangle.Height;
                //if the imgsize is null, the size of the image will 
                //be the same as the size of webbrowser object
                //otherwise  set the image size to imgsize
                Rectangle imgRectangle;
                if (imgsize == null) imgRectangle = docRectangle;
                else imgRectangle = new Rectangle() { Location = new Point(0, 0), Size = imgsize.Value };
                //create a bitmap object 
                Bitmap bitmap = new Bitmap(imgRectangle.Width, imgRectangle.Height);
                //get the viewobject of the WebBrowser
                IViewObject ivo = web.Document.DomDocument as IViewObject;
                using (Graphics g = Graphics.FromImage(bitmap))
                {
                    //get the handle to the device context and draw
                    IntPtr hdc = g.GetHdc();
                    ivo.Draw(1, -1, IntPtr.Zero, IntPtr.Zero,
                             IntPtr.Zero, hdc, ref imgRectangle,
                             ref docRectangle, IntPtr.Zero, 0);
                    g.ReleaseHdc(hdc);
                }
                //invoke the HtmlImageCapture event
                bitmap.Save(fileName);
                bitmap.Dispose();
            }
            catch 
            {
                //System.Diagnostics.Process.GetCurrentProcess().Kill();
            }
            if(HtmlImageCapture!=null) HtmlImageCapture(this, web.Url);
        }
    }
}

和File2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices;
namespace MyIECapt
{
    [ComVisible(true), ComImport()]
    [GuidAttribute("0000010d-0000-0000-C000-000000000046")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IViewObject
    {
        [return: MarshalAs(UnmanagedType.I4)]
        [PreserveSig]
        int Draw(
            [MarshalAs(UnmanagedType.U4)] UInt32 dwDrawAspect,
            int lindex,
            IntPtr pvAspect,
            [In] IntPtr ptd,
            IntPtr hdcTargetDev,
            IntPtr hdcDraw,
            [MarshalAs(UnmanagedType.Struct)] ref Rectangle lprcBounds,
            [MarshalAs(UnmanagedType.Struct)] ref Rectangle lprcWBounds,
            IntPtr pfnContinue,
            [MarshalAs(UnmanagedType.U4)] UInt32 dwContinue);
        [PreserveSig]
        int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect,
           int lindex, IntPtr pvAspect, [In] IntPtr ptd,
            IntPtr hicTargetDev, [Out] IntPtr ppColorSet);
        [PreserveSig]
        int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect,
                        int lindex, IntPtr pvAspect, [Out] IntPtr pdwFreeze);
        [PreserveSig]
        int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze);
    }
}

Thread.Sleep将简单地挂起您的web浏览器正在运行的线程-当它挂起时，您希望它如何呈现任何内容？：(

相反，您需要允许线程处理工作。您可以通过Thread.Sleep(0)和Application.DoEvents()的组合来实现这一点，具体如下：

DateTime finish = DateTime.Now.AddSeconds(3);
while (DateTime.Now < finish) {
    Application.DoEvents();
    Thread.Sleep(0);
}

@L.B，感谢您的帮助！

仅供任何想在类库中运行它的人参考，WebBrowser需要单线程公寓，所以这样做：

  var t = new Thread(InitAndDo); //InitAndDo would have your code creating the webbrowser object etc...
  t.SetApartmentState(ApartmentState.STA);
  t.Start();

然后Gotcha，在导航调用完成后，添加这行代码，以便获得完整的导航事件：

    web.Navigate(Url);
    Application.Run();

我为此创建了一个nuget包https://github.com/dcumin39/RenderHighCharts/wiki