web瀏覽器的執行流

Question

我有這樣的代碼，只需導航到一個網站

class BrowsingUrl { 
    private System.Windows.Forms.WebBrowser nBrowser ; 
     private System.Windows.Forms.Form theFormLayout1; 

    public BrowsingUrl(System.Windows.Forms.Form theFormLayout) { 

      this.nBrowser = new System.Windows.Forms.WebBrowser(); 
      this.nBrowser.Dock = System.Windows.Forms.DockStyle.Fill; 
      this.nBrowser.Location = new System.Drawing.Point(0, 0); 
      this.nBrowser.MinimumSize = new System.Drawing.Size(20, 20); 
      this.nBrowser.Name = "webBrowser1"; 
      this.nBrowser.ScrollBarsEnabled = false; 
      this.nBrowser.Size = new System.Drawing.Size(1300, 700); 
      this.nBrowser.TabIndex = 0; 
      this.theFormLayout1 = theFormLayout; 
      this.theFormLayout1.Controls.Add(this.nBrowser); 
      this.nBrowser.Navigate("https://stackoverflow.com"); 
      this.nBrowser.DocumentCompleted += new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(this.nBrowser_DocumentCompleted); 
    } 

    private void nBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) 
    { 

     // do stuff 
    } 
}  

如果創建一個browsingurl反對一切工作正常，但如果創建了兩個對象，似乎是這兩個構造函數運行在同一時間我怎麼才能讓第二個對象等待，直到第一個終點執行

public partial class Form1 : Form 
{ 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void startbtn_Click(object sender, EventArgs e) 
     { 
      BrowsingUrl BrowsingUrl1 = new BrowsingUrl(this); 
      //wait till browsingUrl1 finish 
      BrowsingUrl BrowsingUrl2 = new BrowsingUrl(this); 
     } 
}  

Answer 1

在nBrowser_DocumentCompleted的_isLoaded值設置爲true並使其作爲一個公共屬性進行訪問。還加ScriptErrorsSuppressed = true。

class BrowsingUrl 
    { 
     private System.Windows.Forms.WebBrowser nBrowser; 
     private System.Windows.Forms.Form theFormLayout1; 
     private bool _isLoaded = false; 
     public bool IsLoaded 
     { 
      get { return _isLoaded && !nBrowser.IsBusy && 
        nBrowser.ReadyState == WebBrowserReadyState.Complete; } 
     } 
     public BrowsingUrl(System.Windows.Forms.Form theFormLayout) 
     { 

      this.nBrowser = new System.Windows.Forms.WebBrowser(); 
      this.nBrowser.Dock = System.Windows.Forms.DockStyle.Fill; 
      this.nBrowser.Location = new System.Drawing.Point(0, 0); 
      this.nBrowser.MinimumSize = new System.Drawing.Size(20, 20); 
      this.nBrowser.Name = "webBrowser1"; 
      this.nBrowser.ScrollBarsEnabled = false; 
      this.nBrowser.Size = new System.Drawing.Size(1300, 700); 
      this.nBrowser.TabIndex = 0; 
      this.theFormLayout1 = theFormLayout; 
      this.theFormLayout1.Controls.Add(this.nBrowser); 
      this.nBrowser.ScriptErrorsSuppressed = true; 
      this.nBrowser.Navigate("https://stackoverflow.com"); 
      this.nBrowser.DocumentCompleted += new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(this.nBrowser_DocumentCompleted); 
     } 
     private void nBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) 
     { 
      //check for frames 
      if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath) 
       return; 

      // do stuff 
      //Sample do stuff 
      Thread.Sleep(10000); 
      // end do stuff 

      _isLoaded = true; 
     } 
    } 

然後你就可以等到BrowsingUrl1加載：

 BrowsingUrl BrowsingUrl1 = new BrowsingUrl(this); 
     //Wait for the first page to load 
     while (!BrowsingUrl1.IsLoaded) 
     { 
      Application.DoEvents(); 
     } 
     BrowsingUrl BrowsingUrl2 = new BrowsingUrl(this); 

的[C＃如何等待一個網頁，然後再繼續完成加載（