C#Windows Forms App-通过打开html发送请求 [英] C# Windows Forms App - send request by opening html

问题描述

我做了一个简单的html测试页.如果打开了页面( http://localhost/cut/public/updateFile )，则我将时间戳发送到我的Web服务器，其中该值被写入文件 date.txt 例如:

2017年4月8日下午14:50:19

我还编写了一个C#Windows Forms App，它每隔X秒向Web服务器发出一个请求，以获取此文件(date.txt)的值.

我的目标是通过从服务器上的文件中读取当前时间，每隔X秒在通知框中显示一次当前时间(仅供练习)

但是，在获取文件内容之前，我当然需要先对其进行更新以获取当前日期和时间.

是否可以使用上面定义的规则解决此问题?这是我的尝试:

  private void timerA_Tick(对象发送者，EventArgs e){sendWebRequest("http://localhost/cut/public/updateFile");timerA.Stop();timerA2.Interval = 5000;timerA2.Start();}private void timerA2_tick(对象发送者，EventArgs e){//返回date.txt的内容字符串响应= sendWebRequest("http://localhost/cut/public/fileApi?action = read& targetFile = date");//显示通知notifyIcon1.Visible = true;notifyIcon1.Icon = SystemIcons.Exclamation;notifyIcon1.BalloonTipTitle =文件内容";notifyIcon1.BalloonTipText =响应;notifyIcon1.BalloonTipIcon = ToolTipIcon.Info;notifyIcon1.ShowBalloonTip(10000);timerA2.Stop();timerA.Start();}/***发送请求并以字符串形式获取响应*/公共静态字符串sendWebRequest(字符串URL){WebRequest request = WebRequest.Create(URL);Web响应响应= request.GetResponse();StreamReader streamReader =新的StreamReader(response.GetResponseStream());返回(string)streamReader.ReadToEnd();} 

但是我总是得到 4/8/2017 @ 14:50:19 ，它没有按应有的方式更新.

由于 WebRequest.Create 仅按原样获取html文件并将其传递回我的C#应用​​程序，但是它不执行我在其中执行的javascript，因此显然不能这样工作向服务器的请求.

我只是在上面创建了这个示例，询问是否有可能以这种方式实现这一目标，或者C#并非旨在解决此类问题?

我唯一的想法是在Form1中创建一个隐藏的Web浏览器，然后打开

我创建了一个webbrowser元素，并这样调用更新URL:

  webBrowser1.Navigate("http://localhost/cut/public/updateFile"); 

但是，在jquery文件中有很多脚本错误消息.

由于无法使用jquery，我的脚本也无法使用.因此，我想它会起作用，但不适用于jquery，否则我必须修复jQuery文件中的所有错误.

如何解决这个问题?

解决方案

我通过在表单中​​添加一个webbrowser元素并在其中调用URL来解决了这个问题:

  webBrowser1.Navigate("http://localhost/cut/public/updateFile"); 

但是，由于C#Webbrowser似乎是一个极端的Internet Explorer，不支持任何功能，因此我不得不重写JavaScript以使其在没有jQuery的情况下也可以工作.有很多警报指向脚本错误，如下所示:

现在，它可以按预期工作.我希望总有一天会有比这更好的解决方案.

更新

通过将以下行添加到html头部分中，我能够将浏览器更改为最新版本:

 <元http-equiv ="X-UA-Compatible" content ="IE = edge"/><！-IE = edge指示WebBrowser控件使用它支持的最新版本的IE-> 

I made a simple html testpage. If the page is opened (http://localhost/cut/public/updateFile) then I send a timestamp to my webserver, where the value is written into a file date.txt e.g.:

4/8/2017 @ 14:50:19

I also wrote a C# Windows Forms App which makes a request to the webserver to get the value of this file (date.txt), every X seconds.

My goal is to show the current time in a notification box every X seconds by reading it from the file on the server (for practice only)

However, before I get the file content, I need to update it first of course to get the current date and time.

Is it possible to solve this with the rules defined above? This is my attempt:

    private void timerA_Tick(object sender, EventArgs e)
    {
        sendWebRequest("http://localhost/cut/public/updateFile");
        timerA.Stop();
        timerA2.Interval = 5000;
        timerA2.Start();
    }


    private void timerA2_tick(object sender, EventArgs e)
    {

        //Returns the content of date.txt
        string response = sendWebRequest("http://localhost/cut/public/fileApi?action=read&targetFile=date");  

        //Show Notification
        notifyIcon1.Visible = true;
        notifyIcon1.Icon = SystemIcons.Exclamation;
        notifyIcon1.BalloonTipTitle = "File content";
        notifyIcon1.BalloonTipText = response;
        notifyIcon1.BalloonTipIcon = ToolTipIcon.Info;
        notifyIcon1.ShowBalloonTip(10000);

        timerA2.Stop();
        timerA.Start();
    }

    /**
     * Send request and get response as string
     */
    public static string sendWebRequest(string URL)
    {
        WebRequest request = WebRequest.Create(URL);
        WebResponse response = request.GetResponse();

        StreamReader streamReader = new StreamReader(response.GetResponseStream());

        return (string)streamReader.ReadToEnd();

    }

However I always get 4/8/2017 @ 14:50:19 it does not update as It should.

It obviously does not work this way, since WebRequest.Create does only gets the html file as it is and delivers it back to my C# Application, but it does not execute the javascript where I make the request to the server.

I only created this example above to ask if it is somehow possible to achive this at this way or if C# is not designed to solve problems like this?

My only idea is to create a hidden webbrowser in my Form1 and open http://localhost/cut/public/updateFile to start the update but I am not sure if this even works.

---

I created a webbrowser element and call the update URL like this:

webBrowser1.Navigate("http://localhost/cut/public/updateFile");

However, there are plenty of script error messages, which are found in the jquery file.

And my script won't work either because of the not working jquery. So I guess it would work, but not with jquery, or I have to fix all errors in the jQuery file.

How to solve this problem?

解决方案

I solved it by adding a webbrowser element to my Form, and calling the URL inside of it like this:

    webBrowser1.Navigate("http://localhost/cut/public/updateFile");

However, I had to rewrote my javascript to make it work without jQuery, since the C# Webbrowser appears to be an extremly old Internet Explorer with no support for nothing. There were plenty alerts pointing to script errors like the one below:

Now it works as expected. I hope someday somebody will come across with a much better solution than this though.

UPDATE

I was able to change the browser to the latest available by adding this line to my html head section:

<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<!-- IE=edge instructs the WebBrowser control to use the latest version of IE it supports -->

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