c# winform 截图 网页

原理：通过winform程序 内置的WebBrowser 打开网页，打开成功后，通过Drawing调整保存图片。

//winform加载事件
private void Form_Load(object sender, EventArgs e)
{    
    //接收web url
    string colle = string.Empty;
    string url = string.Empty;
    //获取进程调用传入的命令
    string[] args = Environment.GetCommandLineArgs();
    //string[] args = new string[] { @"E:\MicroSpace\MicroSpace\localpage\Debug\GetCutImage.exe", "-u:http://sliefj.com/template/amo.html","-n:E:\\TEST\\test.jpg" };
    
    //获取参数
    for (int i = 1; i < args.Length; i++)
    {
        switch (args[i].Substring(0, 3))
        {
            case "-u:":
                url = args[i].Substring(3);
                break;
            case "-n:":
                imagename = args[i].Substring(3);
                break;
            default:                        
                colle = args[i];
                break;
        }
    }            
    WebBrowser webBrowser = new WebBrowser();  // 创建一个WebBrowser
    webBrowser.ScrollBarsEnabled = false;  // 隐藏滚动条
    webBrowser.Navigate(url);  // 打开网页
    webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);  // 增加网页加载完成事件处理函数
}

//webBrowser 页面加载完成后，保存图片        
private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    WebBrowser webBrowser = (WebBrowser)sender;   
    // 网页加载完毕才保存
    if (webBrowser.ReadyState == WebBrowserReadyState.Complete)
    {
        bool save_suc = true;
        try
        {
            // 获取网页高度和宽度,也可以自己设置
            int height = webBrowser.Document.Body.ScrollRectangle.Height;
            int width = webBrowser.Document.Body.ScrollRectangle.Width;

            //截图宽度、高度
            int imgwidth = width - 2 * 60;
            int imgheight = height - 48;

            // 调节webBrowser的高度和宽度
            webBrowser.Height = height;
            webBrowser.Width = width;

            Bitmap bitmap = new Bitmap(width, height);  // 创建高度和宽度与网页相同的图片
            Rectangle rectangle = new Rectangle(0, 0, width, height);  // 绘图区域
            //Rectangle mm=new Rectangle(
            webBrowser.DrawToBitmap(bitmap, rectangle);  // 绘制浏览器图片至bitmap

            int bmpw = bitmap.Width;
            int bmph = bitmap.Height;

            System.Drawing.Image Imag = new System.Drawing.Bitmap(imgwidth, imgheight);//创建Image
            System.Drawing.Graphics gp = System.Drawing.Graphics.FromImage(Imag);//获取Image的Graphics

            //通过Graphics绘图实现截图效果
            gp.DrawImage(bitmap,new Rectangle(0,0,imgwidth,imgheight),new Rectangle(60,48,imgwidth,imgheight),GraphicsUnit.Pixel);
            //保存
            Imag.Save(imagename, System.Drawing.Imaging.ImageFormat.Jpeg);
            //bitmap.Save(imagename, System.Drawing.Imaging.ImageFormat.Jpeg);
            bitmap.Dispose();
            gp.Dispose();
            Imag.Dispose();
        }
        catch (Exception ex)               
        {         
           
        }
        finally
        {
                               
            this.Dispose(true);
            System.Diagnostics.Process.GetCurrentProcess().Kill();
            this.Close();
            Application.Exit();
        }
    }
}

//图片保存方式
//imagename 图片路径
bitmap.Save(imagename, System.Drawing.Imaging.ImageFormat.Jpeg);
Image.Save(imagename, System.Drawing.Imaging.ImageFormat.Jpeg);