从 txt 文件中加载 URL 并在浏览器同步 WebClient httpRequest 中加载 URL [英] Load URL from txt File and load the URL in Browser Synchronous WebClient httpRequest

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本文介绍了从 txt 文件中加载 URL 并在浏览器同步 WebClient httpRequest 中加载 URL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

我用微软的这个例子开始了 Windows Phone 编程:http://code.msdn.microsoft.com/wpapps/Hybrid-Web-App-75b7ef74/view/SourceCode

该应用仅显示浏览器并加载 URL.

现在我想直接从 .txt 文件加载另一个 URL.例如:http://www.test.de/appurl.txt 然后我想在 Windows Phone 应用程序中加载 URL.--> 例如:http://anotherserver.de/index.html?mobileApp>

我的问题是，URL 必须同步加载而不是异步加载.我实现了一个 AutoResetEvent，但它不起作用...

希望有人能帮助我，谢谢！

这是我的代码:

 公共部分类 MainPage : PhoneApplicationPage{//URL zur WebApp//TODO: URL muss aus diesem TEXT-File ausgelesen werden！私有字符串_appURL = "http://www.test.de/appurl.txt";公共字符串_homeURL ="；//私有字符串_homeURL = "http://anotherserver.de/index.html?mobileApp";//URL zur Registrierung von Angeboten私有字符串_registrationURL = "http://anotherserver.de/index.html?bereich=registrierung&mobileApp";//二级瓦片数据//私有Uri _currentURL;//私有Uri _tileImageURL;//私有字符串_pageTitle = "Shop";//在停用时将 URL 序列化为 IsoStorage 以实现快速应用程序恢复私有 Uri _deactivatedURL;私有IsolatedStorageSettings _userSettings = IndependentStorageSettings.ApplicationSettings;//指示我们何时导航到新页面.私人 ProgressIndicator _progressIndicator;//构造函数公共主页(){初始化组件()；//从txt文件中读取URL并设置_homeURL读取文件(_appURL)；//设置进度指示器_progressIndicator = new ProgressIndicator();_progressIndicator.IsIndeterminate = true;_progressIndicator.IsVisible = false;SystemTray.SetProgressIndicator(this, _progressIndicator);//硬件后退键的事件处理程序BackKeyPress += MainPage_BackKeyPress;//快速应用恢复事件PhoneApplicationService.Current.Deactivated += Current_Deactivated;PhoneApplicationService.Current.Closing += Current_Closing;}//AutoResetEvent are = new AutoResetEvent(false);public void ReadFile(字符串地址){var webClient = new WebClient();webClient.OpenReadAsync(new Uri(address));webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);//锁定线程直到网络调用完成//are.WaitOne();//最后调用NotifyComplete方法结束后台代理//通知完成();}void webClient_OpenReadCompleted(对象发送者，OpenReadCompletedEventArgs e){尝试{使用 (var reader = new StreamReader(e.Result)){下载的字符串 = reader.ReadToEnd();Debug.WriteLine("下载= " + 下载);_homeURL = 下载；//工作=假；}}抓住{Debug.WriteLine("请检查您的数据连接");MessageBox.Show("请检查您的数据连接");}//信号锁定线程现在可以继续//are.Set();}#region 应用导航事件protected override void OnNavigatedTo(NavigationEventArgs e){base.OnNavigatedTo(e);//浏览器事件处理程序Browser.Navigating += Browser_Navigating;Browser.Navigated += Browser_Navigated;Browser.NavigationFailed += Browser_NavigationFailed;Browser.IsScriptEnabled = true;//尝试获取为快速应用恢复存储的 URL.尝试{_deactivatedURL = (Uri)(_userSettings["deactivatedURL"]);}catch (System.Collections.Generic.KeyNotFoundException keyNotFound){Debug.WriteLine(keyNotFound.Message);}//我们是从一个固定的瓷砖开始的吗?if (NavigationContext.QueryString.ContainsKey("StartURL")){//导航到固定页面.Browser.Navigate(new Uri(NavigationContext.QueryString["StartURL"], UriKind.RelativeOrAbsolute));}否则 if ((_deactivatedURL != null) && (e.NavigationMode != NavigationMode.Reset)){//如果有我们上次存储的 URL//会话被停用，导航到那里if (Browser.Source != _deactivatedURL){Browser.Navigate(_deactivatedURL);}}别的{//不是从固定磁贴启动...//上次停用应用程序时没有存储的 URL...//所以，只需导航到主页Browser.Navigate(new Uri(_homeURL, UriKind.RelativeOrAbsolute));}}....

解决方案

我的问题是，URL 必须同步加载而不是异步加载

不，你不能同步进行，但使用 async/await 你可以假装它.

为此，您可以使用类似这样的方法(您甚至可以将其编写为扩展方法)

await Navigate(webBrowser1, "http://stackoverflow.com");DoSomethingAfterNavigationCompleted();

<小时>

Task Navigate(WebBrowser wb,string url){var tcs = new TaskCompletionSource();WebBrowserDocumentCompletedEventHandler documentCompleted = null;文档完成 = (o, s) =>{wb.DocumentCompleted -= documentCompleted;tcs.TrySetResult(null);};wb.DocumentCompleted += documentCompleted;wb.Navigate(url);返回 tcs.Task;}
I started Windows Phone programming with this example from Microsoft:
http://code.msdn.microsoft.com/wpapps/Hybrid-Web-App-75b7ef74/view/SourceCode



The app only displays the browser and load a URL.



Now I want to load an other URL directly from a .txt file.
For example: http://www.test.de/appurl.txt and then I want to load the URL in the Windows Phone App.
--> For example: http://anotherserver.de/index.html?mobileApp



My problem is, that the URL have to load synchronous and not asynchronous. I implement a AutoResetEvent, but it don´t work...



Hope somebody can help me, thx!



Here is my Code:
    public partial class MainPage : PhoneApplicationPage
    {
        // URL zur WebApp
        // TODO: URL muss aus diesem TEXT-File ausgelesen werden!
        private string _appURL = "http://www.test.de/appurl.txt";

        public string _homeURL = "";
        //private string _homeURL = "http://anotherserver.de/index.html?mobileApp";

        // URL zur Registrierung von Angeboten 
        private string _registrationURL = "http://anotherserver.de/index.html?bereich=registrierung&mobileApp";

        // Secondary tile data
        //private Uri _currentURL;
        //private Uri _tileImageURL;
        //private string _pageTitle = "Shop ";

        // Serialize URL into IsoStorage on deactivation for Fast App Resume
        private Uri _deactivatedURL;
        private IsolatedStorageSettings _userSettings = IsolatedStorageSettings.ApplicationSettings;

        // To indicate when we're navigating to a new page.
        private ProgressIndicator _progressIndicator;


        // Constructor
        public MainPage()
        {
            InitializeComponent();
            //Read the URL from a txt file and set the _homeURL 
            ReadFile(_appURL);

            // Setup the progress indicator
            _progressIndicator = new ProgressIndicator();
            _progressIndicator.IsIndeterminate = true;
            _progressIndicator.IsVisible = false;
            SystemTray.SetProgressIndicator(this, _progressIndicator);

            // Event handler for the hardware back key
            BackKeyPress += MainPage_BackKeyPress;

            // Fast app resume events
            PhoneApplicationService.Current.Deactivated += Current_Deactivated;
            PhoneApplicationService.Current.Closing += Current_Closing;
        }


        //AutoResetEvent are = new AutoResetEvent(false);

        public void ReadFile(string address)
        {

            var webClient = new WebClient();
            webClient.OpenReadAsync(new Uri(address));
            webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);

            // lock the thread until web call is completed
            //are.WaitOne();

            //finally call the NotifyComplete method to end the background agent
            //NotifyComplete(); 
        }


        void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            try
            {
                using (var reader = new StreamReader(e.Result))
                {
                    string downloaded = reader.ReadToEnd();
                    Debug.WriteLine("downloaded= " + downloaded);
                    _homeURL = downloaded;
                    //work = false;
                }
            }
            catch
            {
                Debug.WriteLine("Please check your data connection");
                MessageBox.Show("Please check your data connection");
            }

              //signals locked thread that can now proceed
              //are.Set();
        }

        #region App Navigation Events

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            // Browser event handlers
            Browser.Navigating += Browser_Navigating;
            Browser.Navigated += Browser_Navigated;
            Browser.NavigationFailed += Browser_NavigationFailed;

            Browser.IsScriptEnabled = true;

            // Try to get the URL stored for fast app resume.
            try
            {
                _deactivatedURL = (Uri)(_userSettings["deactivatedURL"]);
            }
            catch (System.Collections.Generic.KeyNotFoundException keyNotFound)
            {
                Debug.WriteLine(keyNotFound.Message);
            }

            // Were we started from a pinned tile?
            if (NavigationContext.QueryString.ContainsKey("StartURL"))
            {
                // Navigate to the pinned page.
                Browser.Navigate(new Uri(NavigationContext.QueryString["StartURL"], UriKind.RelativeOrAbsolute));
            }
            else if ((_deactivatedURL != null) && (e.NavigationMode != NavigationMode.Reset))
            {
                // If there is a stored URL from our last 
                // session being deactivated, navigate there
                if (Browser.Source != _deactivatedURL)
                {
                    Browser.Navigate(_deactivatedURL);
                }
            }
            else
            {
                // Not launched from a pinned tile...
                // No stored URL from the last time the app was deactivated...
                // So, just navigate to the home page

                Browser.Navigate(new Uri(_homeURL, UriKind.RelativeOrAbsolute));
            }
        }

....



 解决方案 

  
My problem is, that the URL have to load synchronous and not asynchronous


No you can't do it synchronously, but using async/await you can pretend it.



For this, You can use a method something like this (you can even write it as an extension method)
await Navigate(webBrowser1, "http://stackoverflow.com");
DoSomethingAfterNavigationCompleted();







Task Navigate(WebBrowser wb,string url)
{
    var tcs = new TaskCompletionSource<object>();
    WebBrowserDocumentCompletedEventHandler documentCompleted = null;
    documentCompleted = (o, s) =>
    {
        wb.DocumentCompleted -= documentCompleted;
        tcs.TrySetResult(null);
    };

    wb.DocumentCompleted += documentCompleted;
    wb.Navigate(url);
    return tcs.Task;
}



                        
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