在Visual Studio代碼顯示錯誤

Question

顯示，如果google.com沒有打開此代碼，然後打開yahoo.com 的意思是如果第一個網站無法正常運作，然後第二個網站開全自動

但我不知道是什麼問題即視覺工作室示值誤差

末聲明預計

有誰能夠告訴我，我該如何解決這個問題 請幫我解決這個問題 感謝

這是我的完整代碼

公共類Form1中

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
     try webbrowser1.navigate("www.google.com") 
     catch ex As exception webbrowser1.navigate("www.yahoo.com") 
     End Try 


    End Sub 


    Private Sub Back_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Back.Click 
     WebBrowser1.GoBack() 

    End Sub 

    Private Sub Forward_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Forward.Click 
     WebBrowser1.GoForward() 
    End Sub 


    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) 
     WebBrowser1.Stop() 
    End Sub 


    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) 

    End Sub 

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) 
     WebBrowser1.GoHome() 
    End Sub 

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click 
     WebBrowser1.Refresh() 
    End Sub 

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) 

    End Sub 

    Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click 

    End Sub 

    Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label2.Click 

    End Sub 

    Private Sub CloseToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CloseToolStripMenuItem.Click 
     Application.Exit() 

    End Sub 

    Private Sub DateTimePicker1_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DateTimePicker1.ValueChanged 

    End Sub 

    Private Sub WebBrowser1_DocumentCompleted_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted 

    End Sub 

End Class 

Answer 1

你必須把嘗試後回車：

Try 
     webbrowser1.navigate("www.google.com") 
    Catch ex As Exception 
     webbrowser1.navigate("www.yahoo.com") 
    End Try