C# 整个网页保存成图片

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms; 
using System.Drawing.Imaging; 
using System.Runtime.InteropServices; 
using System.Security; 
namespace Print { 
public class Test { 
public static Bitmap GetHtmlImage(Uri UrlString,int Width) 
{ 
WebBrowser MyControl = new WebBrowser(); 
MyControl.Size = new Size(Width, 10); 
MyControl.Url = UrlString; 
while (MyControl.ReadyState != WebBrowserReadyState.Complete) 
{ 
Application.DoEvents(); 
} 
　 MyControl.Height= MyControl.Document.Body.ScrollRectangle.Height+20; 
MyControl.Url = UrlString; 
WebControlImage.Snapshot snap = new WebControlImage.Snapshot(); 
　 Bitmap MyImage= snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(0, 0, MyControl.Width, MyControl.Height)); 
MyControl.Dispose(); 
return MyImage; 
} 
/// 
/// WebBrowser获取图形 
/// 
private class WebControlImage 
{ 
internal static class NativeMethods 
{ 
[StructLayout(LayoutKind.Sequential)] 
public sealed class tagDVTARGETDEVICE 
{ 
[MarshalAs(UnmanagedType.U4)] 
public int tdSize; 
[MarshalAs(UnmanagedType.U2)] 
public short tdDriverNameOffset; 
[MarshalAs(UnmanagedType.U2)] 
public short tdDeviceNameOffset; 
[MarshalAs(UnmanagedType.U2)] 
public short tdPortNameOffset; 
[MarshalAs(UnmanagedType.U2)] 
public short tdExtDevmodeOffset; 
} 
[StructLayout(LayoutKind.Sequential)] 
public class COMRECT 
{ 
public int left; 
public int top; 
public int right; 
public int bottom; 
public COMRECT() 
{ 
} 
public COMRECT(Rectangle r) 
{ 
this.left = r.X; 
this.top = r.Y; 
this.right = r.Right; 
this.bottom = r.Bottom; 
} 
public COMRECT(int left, int top, int right, int bottom) 
{ 
this.left = left; 
this.top = top; 
this.right = right; 
this.bottom = bottom; 
} 
public static NativeMethods.COMRECT FromXYWH(int x, int y, int width, int height) 
{ 
return new NativeMethods.COMRECT(x, y, x + width, y + height); 
} 
public override string ToString() 
{ 
return string.Concat(new object[] { "Left = ", this.left, " Top ", this.top, " Right = ", this.right, " Bottom = ", this.bottom }); 
} 
} 
[StructLayout(LayoutKind.Sequential)] 
public sealed class tagLOGPALETTE 
{ 
[MarshalAs(UnmanagedType.U2)] 
public short palVersion; 
[MarshalAs(UnmanagedType.U2)] 
public short palNumEntries; 
} 
} 
public class Snapshot 
{ 
/// 
/// ?煺? 
/// 
/// Com 对象 
/// 图象大小 
/// 
public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect) 
{ 
if (pUnknown == null) 
return null; 
//必须为com对象 
if (!Marshal.IsComObject(pUnknown)) 
return null; 
//IViewObject 接口 
UnsafeNativeMethods.IViewObject ViewObject = null; 
IntPtr pViewObject = IntPtr.Zero; 
//内存图 
Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height); 
Graphics hDrawDC = Graphics.FromImage(pPicture); 
//获取接口 
object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObjec t(pUnknown), 
ref UnsafeNativeMethods.IID_IViewObject, out pViewObject); 
try 
{ 
　 ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject; 
//调用Draw方法 
ViewObject.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT. DVASPECT_CONTENT, 
-1, 
IntPtr.Zero, 
null, 
IntPtr.Zero, 
hDrawDC.GetHdc(), 
new NativeMethods.COMRECT(bmpRect), 
null, 
IntPtr.Zero, 
0); 
} 
catch (Exception ex) 
{ 
Console.WriteLine(ex.Message); 
throw ex; 
} 
//释放 
hDrawDC.Dispose(); 
return pPicture; 
} 
} 
[SuppressUnmanagedCodeSecurity] 
internal static class UnsafeNativeMethods 
{ 
public static Guid IID_IViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}"); 
[ComImport, Guid("0000010d-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown )] 
public interface IViewObject 
{ 
[PreserveSig] 
　　int Draw([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hdcTargetDev, IntPtr hdcDraw, [In] NativeMethods.COMRECT lprcBounds, [In] NativeMethods.COMRECT lprcWBounds, IntPtr pfnContinue, [In] int dwContinue); 
[PreserveSig] 
　　int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hicTargetDev, [Out] NativeMethods.tagLOGPALETTE 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); 
　　void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects, [In, MarshalAs(UnmanagedType.U4)] int advf, [In, MarshalAs(UnmanagedType.Interface)] System.Runtime.InteropServices.ComTypes.IAdviseSin k pAdvSink); 
　　void GetAdvise([In, Out, MarshalAs(UnmanagedType.LPArray)] int[] paspects, [In, Out, MarshalAs(UnmanagedType.LPArray)] int[] advf, [In, Out, MarshalAs(UnmanagedType.LPArray)] System.Runtime.InteropServices.ComTypes.IAdviseSin k[] pAdvSink); 
} 
} 
} 
} 
}