我可以覆盖 WebBrowser 中的 alert/prompt 对话框行为吗？

Question

有没有类似Qt的东西QWebView's QWebPage where I can override the method that gets called every time a prompt/alert is about to be displayed? I've been told about to implement IDocHostShowUI but even after done some search, I have no idea how do this with WebBrowser.

Answer 1

Paulo Morgado 在 MSDN forums 上提供了答案。

下面为将来的读者提供了 post 中的代码和注释。

It's the WebBrowserSite, not the WebBrowser that needs to implement IDocHostShowUI

 using System;
 using System.Runtime.InteropServices;

 namespace WebBrowserMessageBox
 {
    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
       public int x;
       public int y;
    }



    [ComImport, Guid("C4D244B0-D43E-11CF-893B-00AA00BDCE1A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
      public interface IDocHostShowUI
      {
        [return: MarshalAs(UnmanagedType.U4)]
        [PreserveSig]
        int ShowMessage(IntPtr hwnd,
          [MarshalAs(UnmanagedType.LPWStr)] string lpstrText,
          [MarshalAs(UnmanagedType.LPWStr)] string lpstrCaption,
          int dwType,
          [MarshalAs(UnmanagedType.LPWStr)] string lpstrHelpFile,
          int dwHelpContext,
          out int lpResult);
    [return: MarshalAs(UnmanagedType.U4)]
    [PreserveSig]
    int ShowHelp(
      IntPtr hwnd,
      [MarshalAs(UnmanagedType.LPWStr)] string pszHelpFile,
      int uCommand,
      int dwData,
      POINT ptMouse,
      [MarshalAs(UnmanagedType.IDispatch)] object pDispatchObjectHit);
  }

  public class ShowMessageEventArgs : EventArgs
 {
    public ShowMessageEventArgs(string text, string caption, int type, string helpFile, int helpContext)
    {
    }

    public bool Handled { get; set; }
    public int Result { get; set; }
    public int Type { get; private set; }
    public int HelpContext { get; private set; }
    public string Text { get; private set; }
    public string Caption { get; private set; }
    public string HelpFile { get; private set; }
  }

  public class MyWebBrowser : global::System.Windows.Forms.WebBrowser
  {
    protected class MyWebBrowserSite : global::System.Windows.Forms.WebBrowser.WebBrowserSite, IDocHostShowUI
    {
      private readonly MyWebBrowser host;

      public MyWebBrowserSite(MyWebBrowser host)
        : base(host)
      {
        this.host = host;
      }

      public int ShowMessage(IntPtr hwnd, string lpstrText, string lpstrCaption, int dwType, string lpstrHelpFile, int dwHelpContext, out int lpResult)
      {
        var e = new ShowMessageEventArgs(lpstrText, lpstrCaption, dwType, lpstrHelpFile, dwHelpContext);
        this.host.OnShowMessage(e);

        if (e.Handled)
        {
          lpResult = e.Result;
          return 0;
        }
        else
        {
          lpResult = 0;
          return 1;
        }
      }

      public int ShowHelp(IntPtr hwnd, string pszHelpFile, int uCommand, int dwData, POINT ptMouse, object pDispatchObjectHit)
      {
        return 1;
      }
    }

    protected override System.Windows.Forms.WebBrowserSiteBase CreateWebBrowserSiteBase()
    {
      return new MyWebBrowserSite(this);
    }

    protected virtual void OnShowMessage(ShowMessageEventArgs e)
    {
      var handler = this.Events["ShowMessage"] as EventHandler<ShowMessageEventArgs>;

      if (handler != null)
      {
        handler(this, e);
      }
    }

    public event EventHandler<ShowMessageEventArgs> ShowMessage
    {
      add { this.Events.AddHandler("ShowMessage", value); }
      remove { this.Events.RemoveHandler("ShowMessage", value); }
    }
  }

  public static class Program
  {
    [STAThread]
    private static void Main(params string[] args)
    {
      var webBrowser = new MyWebBrowser
      {
        Dock = System.Windows.Forms.DockStyle.Fill,
        DocumentText = @"<html><head><body><script language='JScript'>alert(""test"")</script></body></head></html>"
      };
      webBrowser.ShowMessage += (sender, e) =>
      {
        e.Result = 0;
        e.Handled = true;
      };

      var form = new global::System.Windows.Forms.Form
      {
        Controls = { webBrowser }
      };

      global::System.Windows.Forms.Application.Run(form);
    }
  }
}

请注意我不是此代码的作者。

我可以覆盖 WebBrowser 中的 alert/prompt 对话框行为吗？

Can I override the alert/prompt dialog boxes behavior in a WebBrowser?

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