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WebBrowser屏蔽alert是用重定義alert,confirm實現的。比較簡單。代碼如下：
添加 com 引用 microsoft html object library
using mshtml;

1、頁面一加載就有彈出框的自動點擊(屏蔽)

private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
IHTMLWindow2 win = (IHTMLWindow2)webBrowser1.Document.Window.DomWindow;
string s = @"function confirm() {return true;}";
s += @"function alert() {}";
win.execscript(s, "javascript");
}

private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
      {
          //自動點擊彈出確認或彈出提示
          IHTMLDocument2 vDocument = (IHTMLDocument2)webBrowser1.Document.DomDocument;
          vDocument.parentWindow.execscript("function confirm(str){return true;} ", "javascript"); //彈出確認
          vDocument.parentWindow.execscript("function alert(str){return true;} ", "javascript");//彈出提示
      }

2、WebBrowser頁面加載完畢之后，在頁面中進行一些自動化操作的時候彈出框的自動點擊(屏蔽)

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            //自動點擊彈出確認或彈出提示
            IHTMLDocument2 vDocument = (IHTMLDocument2)webBrowser1.Document.DomDocument;
            vDocument.parentWindow.execscript("function confirm(str){return true;} ", "javascript"); //彈出確認
            vDocument.parentWindow.execscript("function alert(str){return true;} ", "javascript");//彈出提示
//下面是你的執行操作代碼
}

我的不是這樣弄的，雖然代碼一樣，但是我是在執行具體任務的時候，才會寫入這個，然后執行這段代碼＋我自己的點擊代碼。

剛才在網上找了下，還有另一種治本的方法呵，高人到處都是。下面是代碼，是繼承的webBrowser然后屏弊了ShowMessage

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace Test
{

public class MyWebBrowser : System.Windows.Forms.WebBrowser
{
#region ExtendedWebBrowserSite
class ExtendedWebBrowserSite : WebBrowser.WebBrowserSite, UnsafeNativeMethods.IDocHostShowUI
{
public ExtendedWebBrowserSite(WebBrowser host)
: base(host)
{
}

void UnsafeNativeMethods.IDocHostShowUI.ShowMessage(ref UnsafeNativeMethods._RemotableHandle hwnd, string lpstrText, string lpstrCaption, uint dwType, string lpstrHelpFile, uint dwHelpContext, out int plResult)
{
plResult = 0;
//TODO:自定義
}
void UnsafeNativeMethods.IDocHostShowUI.ShowHelp(ref UnsafeNativeMethods._RemotableHandle hwnd, string pszHelpFile, uint uCommand, uint dwData, UnsafeNativeMethods.tagPOINT ptMouse, object pDispatchObjectHit)
{
//TODO:自定義
}
}

protected override WebBrowserSiteBase createWebBrowserSiteBase()
{
return new ExtendedWebBrowserSite(this);
}
#endregion
}

public class UnsafeNativeMethods
{
#region IDocHostShowUI
[StructLayout(LayoutKind.Explicit, Pack = 4)]
public struct __MIDL_IWinTypes_0009
{
// Fields
[FieldOffset(0)]
public int hInproc;
[FieldOffset(0)]
public int hRemote;
}

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct _RemotableHandle
{
public int fContext;
public __MIDL_IWinTypes_0009 u;
}

[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct tagPOINT
{
public int x;
public int y;
}

[ComImport, Guid("C4D244B0-D43E-11CF-893B-00AA00BDCE1A"), InterfaceType((short)1)]
public interface IDocHostShowUI
{
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void ShowMessage([In, ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.wireHWND")] ref _RemotableHandle hwnd, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrText, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrCaption, [In] uint dwType, [In, MarshalAs(UnmanagedType.LPWStr)] string lpstrHelpFile, [In] uint dwHelpContext, [ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.LONG_PTR")] out int plResult);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void ShowHelp([In, ComAliasName("ExtendedWebBrowser2.UnsafeNativeMethods.wireHWND")] ref _RemotableHandle hwnd, [In, MarshalAs(UnmanagedType.LPWStr)] string pszHelpFile, [In] uint uCommand, [In] uint dwData, [In] tagPOINT ptMouse, [Out, MarshalAs(UnmanagedType.IDispatch)] object pDispatchObjectHit);
}
#endregion

}
}
這個是直接復制過來的啊，這編輯器沒有代碼功能，汗。。。有點亂。但很好的屏弊webBrowser里的alert,confirm了。

不管怎么樣，有二種方法，可以實現webBrowser屏弊alert了。