1     public enum LoadingState
2     {
3         NotLoading,//正常的网页内容界面
4         Loading,   //加载进度显示
5         Error,     //加载失败界面
6     }

 1     /// <summary>
 2     /// 文档加载完成
 3     /// </summary>
 4     /// <remark>Navigate方法触发，Refresh方法不会触发</remark>
 5     /// <remark>在首次加载时，添加DocumentCompleted订阅</remark>
 6     /// <param name="sender"></param>
 7     /// <param name="e"></param>
 8     private void Browser_OnDocumentCompleted(object sender, HtmlDocumentCompletedEventArgs e)
 9     {
10         //当前Loading状态不是Error的情况下，才结束加载
11         if (LoadingState == LoadingState.Loading)
12         {
13             LoadingState = LoadingState.NotLoading;
14         }
15 
16         //显示网页内容首次加载后，再订阅加载进度事件
17         _browser.ProgressChanged -= Browser_ProgressChanged;
18         _browser.ProgressChanged += Browser_ProgressChanged;
19         OnDocumentCompleted(e);
20     }
21 
22     /// <summary>
23     /// 加载进度事件
24     /// </summary>
25     /// <remark>Navigate会触发多次ProgressChanged事件，所以此事件订阅不应开放给Navigate</remark>
26     /// <remark>Refresh调用后，会触发一次</remark>
27     /// <param name="sender"></param>
28     /// <param name="e"></param>
29     private void Browser_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
30     {
31         //当前进度大于0，且当前Loading状态是Loading的情况下，才结束Loading动画
32         if (e.CurrentProgress > 0 && LoadingState == LoadingState.Loading)
33         {
34             LoadingState = LoadingState.NotLoading;
35         }
36     }

 1     private void Browser_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
 2     {
 3         //当以下俩种条件符合时，才结束Loading动画
 4         //1.当前Loading状态是Loading的情况下
 5         //2.当前进度大于0，或者当前进度等于进度上限阀值
 6         if (LoadingState == LoadingState.Loading && (e.CurrentProgress > 0 || e.CurrentProgress == e.MaximumProgress))
 7         {
 8             LoadingState = LoadingState.NotLoading;
 9         }
10     }

 1     private void Browser_NavigateError(object sender, BrowserExtendedNavigateErrorEventArgs e)
 2     {
 3         e.Cancel = true;
 4         LoadingState = LoadingState.Error;
 5 
 6         //当前不是网络问题的异常，记录异常日志
 7         if (e.StatusCode != NavigationErrorHttpStatusCode.INET_E_RESOURCE_NOT_FOUND)
 8         {
 9             Console.WriteLine($"WebBrowser无法连接服务器：{e.Url}，异常信息为：{e.StatusCode}，异常Code为：{ (int)e.StatusCode }");
10         }
11     }

1     /// <summary>
2     ///   在 <see cref="T:System.Windows.Forms.WebBrowser" /> 控件完成加载文档时发生。
3     /// </summary>
4     [SRCategory("CatBehavior")]
5     [SRDescription("WebBrowserDocumentCompletedDescr")]
6     public event WebBrowserDocumentCompletedEventHandler DocumentCompleted;

1     /// <summary>
2     ///   在 <see cref="T:System.Windows.Forms.WebBrowser" /> 控件已更新有关要导航到的文档的下载进度的信息时发生。
3     /// </summary>
4     [SRCategory("CatAction")]
5     [SRDescription("WebBrowserProgressChangedDescr")]
6     public event WebBrowserProgressChangedEventHandler ProgressChanged;

1     public void NavigateError(object pDisp, ref object url, ref object frame, ref object statusCode, ref bool cancel)
2     {
3         _browser?.NavigateError?.Invoke(this, new BrowserExtendedNavigateErrorEventArgs((string)url, (string)frame, (int)statusCode, cancel));
4     }

 1     private void Register()
 2     {
 3         _cefBrowser.LoadingStateChanged += CefBrowserOnLoadingStateChanged;
 4         _cefBrowser.LoadError += CefBrowserOnLoadError;
 5     }
 6     private void CefBrowserOnLoadError(object sender, LoadErrorEventArgs args)
 7     {
 8         // Don't display an error for downloaded files where the user aborted the download.
 9         if (args.ErrorCode == CefErrorCode.Aborted)
10         {
11             return;
12         }
13         _isLoadError = true;
14         DispatcherUtil.Invoke(() =>
15         {
16             NavigateError?.Invoke(this, new BrowserExtendedNavigateErrorEventArgs(args.FailedUrl, args.Frame.Name, (int)args.ErrorCode, false));
17         });
18     }
19 
20     private void CefBrowserOnLoadingStateChanged(object sender, LoadingStateChangedEventArgs args)
21     {
22         //isLoading为false，代表LoadingCompleted
23         //_isLoadError为false，代表未加载出错
24         if (!args.IsLoading && !_isLoadError)
25         {
26             DispatcherUtil.Invoke(() =>
27             {
28                 DocumentCompleted?.Invoke(this, new HtmlDocumentCompletedEventArgs(null));
29             });
30         }
31     }