Question

我有如下XML文件：

<?xml version="1.0" encoding="ISO-8859-1"?>
<sami>
<title>IN[1]=false</title>
<title>IN[2]=true</title>
<title>OUT[1]=true</title>
<title>OUT[2]=flase</title>
<title>OUT[3]=flase</title>
<title>OUT[4]=flase</title>
<title>$IN[5]=false</title>
</sami>

问题：如何使用C＃每秒读取xml数据？

我尝试了以下操作：

private void Form1_Load(object sender, EventArgs e)
{
    DateTime nextRead;
    Thread thread = new Thread(() =>
    {
        nextRead = DateTime.Now.AddSeconds(1000);
        XDocument doc = XDocument.Load("C:\\Users\\lenovo\\Desktop\\Sxml.xml");
        var result = doc.Descendants("title").ToList();
        textBox1.Text = result[0].Value;
      //  listBox1.Items.Add(result[0].Value);
       // listBox1.Items.Add(result[1].Value);
       // listBox1.Items.Add(result[2].Value);
        Thread.Sleep(Math.Max(0, (DateTime.Now - nextRead).Milliseconds));

    });
    thread.Start();
}

Answer 1

您可以使用Task.Delay重复读取xml文件。 1，创建一个任务方法以重复读取xml文件：

{
    "name": "dragi",
    "version": "0.1.0",
    "private": true,
    "dependencies": {
        "axios": "^0.18.0",
        "prop-types": "^15.6.2",
        "react": "^16.4.2",
        "react-dom": "^16.4.2",
        "react-redux": "^5.0.7",
        "react-router": "^4.3.1",
        "react-router-dom": "^4.3.1",
        "react-scripts": "1.1.5",
        "redux": "^4.0.0",
        "redux-devtools-extension": "^2.13.5",
        "redux-thunk": "^2.3.0",
        "semantic-ui-css": "^2.3.3",
        "semantic-ui-react": "^0.82.3",
        "validator": "^10.7.0"
    },
    "scripts": {
        "start": "react-scripts start",
        "build": "react-scripts build",
        "test": "react-scripts test --env=jsdom",
        "eject": "react-scripts eject",
        "lint": "eslint src"
    },
    "devDependencies": {
        "eslint": "^5.5.0",
        "eslint-config-airbnb": "^17.1.0",
        "eslint-config-prettier": "^3.0.1",
        "eslint-plugin-import": "^2.14.0",
        "eslint-plugin-jsx-a11y": "^6.1.1",
        "eslint-plugin-prettier": "^2.6.2",
        "eslint-plugin-react": "^7.11.1",
        "prettier": "^1.14.2"
    },
    "proxy": "http://localhost:8080"
}

并在需要重复阅读的地方调用它：

static async Task RepeadtReadingXml(int delayMillis, int repeatMillis, CancellationToken ct)

    {

        Console.WriteLine("{0}: Start reading xml file", DateTime.Now);

        await Task.Delay(delayMillis, ct);

        while (true)

        {

            Console.WriteLine("{0}: Reading xml file every 1 sec", DateTime.Now);

            //***************************************************//
            //     Add you logic to read your xml file here      //
            //***************************************************//

            await Task.Delay(repeatMillis, ct);

        }

    }

Answer 2

为此，您需要从工具箱中添加到表单Timer。

将timer1间隔设置为1000毫秒。为timer1.Tick事件创建事件hadnler：

public partial class Form1 : Form
{
    XDocument doc;

    public Form1()
    {
        InitializeComponent();

        timer1.Start();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        doc = XDocument.Load("C:\\Users\\Mi\\Desktop\\Sxml.xml");
        var result = doc.Descendants("title").ToList();
        textBox1.Text = result[0].Value;
        listBox1.Items.Add(result[0].Value);
        listBox1.Items.Add(result[1].Value);
        listBox1.Items.Add(result[2].Value);
    }
}

用C＃连续阅读XML

2 个答案: