WebBrowser控件页面加载错误 [英] WebBrowser control page load error
本文介绍了WebBrowser控件页面加载错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有我的WinForm WebBrowser控件。当我尝试浏览到一些网站我得到标准的IE错误页面,如:
I have WebBrowser control on my winform. When I try navigate to some web-site I get standard IE error pages like:
- 在导航到网页已取消
- 在地址是无效
- 在页面无法加载
- 等
我需要处理这些错误,并返回自定义错误信息给用户。请问有什么办法可以解决这个问题呢?
I need to handle these errors and return custom error message to user. Is there any way to solve this issue?
推荐答案
您要处理的NavigateError事件如<一个href="http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.createsink%28VS.80%29.aspx"相对=nofollow>这里
You want to handle the NavigateError event as shown here
编辑:包括链路例如code:
including example code from the link:
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Security.Permissions;
namespace WebBrowserExtensibility
{
[PermissionSetAttribute(SecurityAction.Demand, Name="FullTrust")]
public class Form1 : Form
{
[STAThread]
public static void Main()
{
Application.Run(new Form1());
}
private WebBrowser2 wb = new WebBrowser2();
public Form1()
{
wb.Dock = DockStyle.Fill;
wb.NavigateError += new
WebBrowserNavigateErrorEventHandler(wb_NavigateError);
Controls.Add(wb);
// Attempt to navigate to an invalid address.
wb.Navigate("www.widgets.microsoft.com");
}
private void wb_NavigateError(
object sender, WebBrowserNavigateErrorEventArgs e)
{
// Display an error message to the user.
MessageBox.Show("Cannot navigate to " + e.Url);
}
}
public class WebBrowser2 : WebBrowser
{
AxHost.ConnectionPointCookie cookie;
WebBrowser2EventHelper helper;
[PermissionSetAttribute(SecurityAction.LinkDemand, Name="FullTrust")]
protected override void CreateSink()
{
base.CreateSink();
// Create an instance of the client that will handle the event
// and associate it with the underlying ActiveX control.
helper = new WebBrowser2EventHelper(this);
cookie = new AxHost.ConnectionPointCookie(
this.ActiveXInstance, helper, typeof(DWebBrowserEvents2));
}
[PermissionSetAttribute(SecurityAction.LinkDemand, Name="FullTrust")]
protected override void DetachSink()
{
// Disconnect the client that handles the event
// from the underlying ActiveX control.
if (cookie != null)
{
cookie.Disconnect();
cookie = null;
}
base.DetachSink();
}
public event WebBrowserNavigateErrorEventHandler NavigateError;
// Raises the NavigateError event.
protected virtual void OnNavigateError(
WebBrowserNavigateErrorEventArgs e)
{
if (this.NavigateError != null)
{
this.NavigateError(this, e);
}
}
// Handles the NavigateError event from the underlying ActiveX
// control by raising the NavigateError event defined in this class.
private class WebBrowser2EventHelper :
StandardOleMarshalObject, DWebBrowserEvents2
{
private WebBrowser2 parent;
public WebBrowser2EventHelper(WebBrowser2 parent)
{
this.parent = parent;
}
public void NavigateError(object pDisp, ref object url,
ref object frame, ref object statusCode, ref bool cancel)
{
// Raise the NavigateError event.
this.parent.OnNavigateError(
new WebBrowserNavigateErrorEventArgs(
(String)url, (String)frame, (Int32)statusCode, cancel));
}
}
}
// Represents the method that will handle the WebBrowser2.NavigateError event.
public delegate void WebBrowserNavigateErrorEventHandler(object sender,
WebBrowserNavigateErrorEventArgs e);
// Provides data for the WebBrowser2.NavigateError event.
public class WebBrowserNavigateErrorEventArgs : EventArgs
{
private String urlValue;
private String frameValue;
private Int32 statusCodeValue;
private Boolean cancelValue;
public WebBrowserNavigateErrorEventArgs(
String url, String frame, Int32 statusCode, Boolean cancel)
{
urlValue = url;
frameValue = frame;
statusCodeValue = statusCode;
cancelValue = cancel;
}
public String Url
{
get { return urlValue; }
set { urlValue = value; }
}
public String Frame
{
get { return frameValue; }
set { frameValue = value; }
}
public Int32 StatusCode
{
get { return statusCodeValue; }
set { statusCodeValue = value; }
}
public Boolean Cancel
{
get { return cancelValue; }
set { cancelValue = value; }
}
}
// Imports the NavigateError method from the OLE DWebBrowserEvents2
// interface.
[ComImport, Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch),
TypeLibType(TypeLibTypeFlags.FHidden)]
public interface DWebBrowserEvents2
{
[DispId(271)]
void NavigateError(
[In, MarshalAs(UnmanagedType.IDispatch)] object pDisp,
[In] ref object URL, [In] ref object frame,
[In] ref object statusCode, [In, Out] ref bool cancel);
}
}
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