1.使用System.Windows.Forms命名空间下的WebBrowser控件加载网页并生成图片
GiHub参考地址：
https://github.com/tianma3798/FileOparate/
使用方法：
public static void TestOne()
{
ThumbnailImg img = new ThumbnailImg("e:\\one.png");
//img.SetToJpeg();
//img.SetToGif();
ThumbnailOperate _operate = new ThumbnailOperate("http://korea.weilanliuxue.cn", img);
_operate.GenerateImg();
Console.WriteLine("保存成功");
}
核心代码类：
/// <summary>
/// 网页生成生成图片帮助类
/// </summary>
public class Thumbnail
{
/// <summary>
/// 网页生成的图片
/// </summary>
private Bitmap _bitmap;
private string _url;
private int _browserWidth, _browserHeight, _tWidth, _tHeight;
/// <summary>
/// 是否使用，指定的宽度和高度
/// </summary>
public bool IsCustumer { get; set; }
/// <summary>
/// 指定网页地址，使用页面的body的高度
/// 生成图片的，宽度和高度与body相同
/// </summary>
/// <param name="url">网页地址</param>
/// <param name="browserWidth">浏览器宽度</param>
public Thumbnail(string url, int browserWidth)
{
IsCustumer = false;
_url = url;
_browserWidth = browserWidth;
}
/// <summary>
/// 初始化构造
/// </summary>
/// <param name="url">网页地址</param>
/// <param name="browserWidth">浏览器宽度</param>
/// <param name="browserHeight">浏览器高度</param>
/// <param name="tWidth">生成图片宽度</param>
/// <param name="tHeight">生成图片高度</param>
public Thumbnail(string url, int browserWidth, int browserHeight, int tWidth, int tHeight)
{
IsCustumer = true;
_url = url;
_browserWidth = browserWidth;
_browserHeight = browserHeight;
_tWidth = tWidth;
_tHeight = tHeight;
}
/// <summary>
/// 获取网页的图片
/// </summary>
/// <param name="url">网页地址</param>
/// <param name="browserWidth">浏览器宽度</param>
/// <param name="browserHeight">浏览器高度</param>
/// <param name="tWidth">生成图片宽度</param>
/// <param name="tHeight">生成图片高度</param>
public static Bitmap GetThumbnail(string url, int browserWidth, int browserHeight, int tWidth, int tHeight)
{
Thumbnail thumb = new Thumbnail(url, browserWidth, browserHeight, tWidth, tHeight);
return thumb.GenerateImage();
}
/// <summary>
/// 生成图片信息
/// </summary>
/// <returns></returns>
public Bitmap GenerateImage()
{
Thread thread = new Thread(new ThreadStart(_GenerateImage));
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
thread.Join();
return _bitmap;
}
/// <summary>
/// 使用WebBrowser生成图片
/// </summary>
private void _GenerateImage()
{
WebBrowser browser = new WebBrowser();
browser.ScrollBarsEnabled = false;
browser.ScriptErrorsSuppressed = false;
browser.Navigate(_url);
browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(_DocumentCompleted);
while (browser.ReadyState != WebBrowserReadyState.Complete)
Application.DoEvents();
browser.Dispose();
}
/// <summary>
/// 页面加载完成事件
/// </summary>
private void _DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser browser = sender as WebBrowser;
if (IsCustumer)
{
//生成自定义宽度和高度的图片
browser.ClientSize = new Size(_browserWidth, _browserHeight);
_bitmap = new Bitmap(browser.Bounds.Width, browser.Bounds.Height);
browser.DrawToBitmap(_bitmap, browser.Bounds);
_bitmap = (Bitmap)_bitmap.GetThumbnailImage(_tWidth, _tHeight, null, IntPtr.Zero);
}
else
{
//生成默认body宽度和高度的图片（最常用）
_browserHeight = ;
if (browser.Document.Body != null)
{
_browserHeight = browser.Document.Body.OffsetRectangle.Height;
browser.ClientSize = new Size(_browserWidth, _browserHeight);
Rectangle bodyRect = browser.Document.Body.OffsetRectangle;
_bitmap = new Bitmap(_browserWidth, bodyRect.Height);
browser.BringToFront();
browser.DrawToBitmap(_bitmap, bodyRect);
_bitmap = (Bitmap)_bitmap.GetThumbnailImage(_browserWidth, bodyRect.Height, null, IntPtr.Zero);
}
else
{
browser.ClientSize = new Size(_browserWidth, _browserHeight);
_bitmap = new Bitmap(_browserWidth, _browserHeight);
browser.BringToFront();
browser.DrawToBitmap(_bitmap, new Rectangle(,,_browserWidth,_browserHeight));
_bitmap = (Bitmap)_bitmap.GetThumbnailImage(_browserWidth, _browserHeight, null, IntPtr.Zero);
} //_bitmap = (Bitmap)_bitmap.GetThumbnailImage(bodyRect.Width, bodyRect.Height, null, IntPtr.Zero);
}
}
}