网页截图 webbrowser 内存溢出

[xswwsx1234567]

我在用webbrowser 进行网页截图，每截一次，iis进程所占的内存就会增加，直至最后内存溢出 报“引发类型为 system.outofmemoryexception 的异常” 网上查了许多的资料，还是没解决，大家有什么好的方法吗。

[mngzilin]

上代码。

[xswwsx1234567]

aspx.cs里
bitmap bmp
bmp = Okpower.Utility.WebPreview.GetWebPreview(new Uri(url), 0x493e0, 800, 600, true);

Okpower.Utility.WebPreview 这个类的代码如下

 namespace Okpower.Utility
{
    public class WebPreview
    {
        // Fields
        private Bitmap _bitmap;
        private Exception _ex;
        private bool _fullPage;
        private int _height;
        private int _timeout;
        private Uri _uri;
        private int _width;

       // Methods
       // 实现基类的构造函数
        private WebPreview(Uri uri)
            : this(uri, 0x7530, 200, 150, true)
        {
        }

       //构造函数
        private WebPreview(Uri uri, int timeout, int width, int height, bool fullPage)
        {
            this._uri = null;
            this._ex = null;
            this._bitmap = null;
            this._timeout = 0x7530;
            this._width = 200;
            this._height = 150;
            this._fullPage = true;
            this._uri = uri;
            this._timeout = timeout;
            this._width = width;
            this._height = height;
            this._fullPage = fullPage;
        }

       // 启动单线程单元 获得位图 
        internal Bitmap GetWebPreview()
        {
            Thread t = new Thread(new ParameterizedThreadStart(WebPreview.StaRun));
            t.SetApartmentState(ApartmentState.STA);
            t.Start(this);
            if (!t.Join(this._timeout))
            {
                t.Abort();
                throw new TimeoutException();
            }
            if (this._ex != null)
            {
                throw this._ex;
            }
            if (this._bitmap == null)
            {
                throw new ExecutionEngineException();
            }
            return this._bitmap;
        }

       // 
        public static Bitmap GetWebPreview(Uri uri)
        {
            WebPreview wp = new WebPreview(uri);
            return wp.GetWebPreview();
        }

        public static Bitmap GetWebPreview(Uri uri, int timeout, int width, int height, bool fullPage)
        {
            WebPreview wp = new WebPreview(uri, timeout, width, height, fullPage);
            return wp.GetWebPreview();
        }

        private static void StaRun(object _wp)
        {
            WebPreview wp = (WebPreview)_wp;
            try
            {
                wp._bitmap = new WebPreviewBase(wp._uri, wp._width, wp._height, wp._fullPage).GetWebPreview();
            }
            catch (Exception ex)
            {
                wp._ex = ex;
            }
        }
    }
 

还有好几个类，太长了 ，整个是一个类库，我在aspx 里调用截图的时候，只用到类库这样的的一个方法去获得bitmap对象
bmp = Okpower.Utility.WebPreview.GetWebPreview(new Uri(url), 0x493e0, 800, 600, true);

[xswwsx1234567]

WebPreviewBase 这个类的部分代码

 internal class WebPreviewBase : IDisposable
{
    // Fields
    private bool _fullpage = false;
    private int _thumbH = 0x300;
    private int _thumbW = 0x400;
    private Uri _uri= new Uri("about:blank");
    private WebBrowser _wb = new WebBrowser();
    private int h;
    private int w;

    // 构造函数
    public WebPreviewBase(Uri uri, int thumbW, int thumbH, bool fullpage)
    {
        this._wb.ScriptErrorsSuppressed = false;
        this._wb.ScrollBarsEnabled = false;
        this._wb.Size = new Size(0x400, 0x300);
        this._wb.NewWindow += new CancelEventHandler(this.CancelEventHandler);
        this._wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(this.DocCompletedEventHandler);
        this._thumbW = thumbW;
        this._thumbH = thumbH;
        this._uri = uri;
        this._fullpage = fullpage;
    }

  public Bitmap GetWebPreview()
    {
        Bitmap Bmp3;
        try
        {
            object o = this._wb.ActiveXInstance;
            this._wb.GoBack();
            this.InitComobject();
            Snapshot snap = new Snapshot();
            Bitmap thumBitmap = (Bitmap) ImageLibrary.ResizeImageToAFixedSize(snap.TakeSnapshot(this._wb.ActiveXInstance, new Rectangle(0, 0, this.w, this.h)), this._thumbW, this._thumbH, ImageLibrary.ScaleMode.W);
            Bmp3 = thumBitmap;
        }
        catch (Exception ex)
        {
            throw ex;
        }
        return Bmp3;
    }

  public void Dispose()
    {
        this._wb.Dispose();
    }

[xswwsx1234567]

自己顶