文本文件分类到数据字典

Question

我正在尝试创建一个文本文件，该文本文件进入一个类并将对象存储到数据字典中，然后创建一个允许我添加、编辑和删除等的 GUI。

我的文本文件的语法如下：

国家、GDP 增长、通货膨胀、贸易平衡、人类发展指数排名、主要贸易伙伴

例子：

• 美国,1.8,2,-3.1,4,[加拿大;英国;巴西]
• 加拿大,1.9,2.2,-2,6,[美国;中国]

无论如何，在创建 GUI 之前，我会先尝试使其在控制台中运行。国家出现在控制台中，但使用调试器中的步骤，我的对象数组和我的数据字典（如果我正确创建了数据字典）似乎正在存储，但是当它进入下一个国家时，它会覆盖前一个。我怎样才能做到这一点，以便所有国家都得到存储，而不仅仅是一个。如果这是有道理的，任何帮助将不胜感激。

我的代码：

 class Program
{
    static void Main(string[] args)
    {

        const int MAX_LINES_FILE = 50000;
        string[] AllLines = new string[MAX_LINES_FILE];
        int i = 0;
        //reads from bin/DEBUG subdirectory of project directory
        AllLines = File.ReadAllLines(@"C:\Users\Jack\Documents\countries.csv");
        country[] newCountry = new country[30];

        foreach (string line in AllLines)
        {
            if (line.StartsWith("Country")) //found first line - headers
            {
                headers = line.Split(',');
            }
            else
            {
               string[] columns = line.Split(',');
                      newCountry[i] = new country();
                 newCountry[i].Country=(columns[0]);
                 newCountry[i].GDP=(columns[1]);
                 newCountry[i].Inflation=(columns[2]);
                 newCountry[i].TB =(columns[3]);
                 newCountry[i].HDI =(columns[4]);
                 newCountry[i].TP = (columns[5]);


                Dictionary<object, string> CountryList = new Dictionary<object, string>();
                CountryList.Add(newCountry[i].Country, newCountry[i].GDP + "," + newCountry[i].Inflation + "," + newCountry[i].TB + "," + newCountry[i].HDI + "," + newCountry[i].TP);
                i++;

               foreach (KeyValuePair<object, string> country in CountryList)
                {
                    Console.WriteLine("Country = {0}, GDP = {1}",
                        country.Key, country.Value);
                }

            }
            Console.ReadKey();
        }
    }

    public static string[] headers { get; set; }
}


public class country
{
    public string Country { get; set; }
    public string GDP { get; set; }
    public string Inflation { get; set; }
    public string TB { get; set; }
    public string HDI { get; set; }
    public string TP { get; set; }

}

}

编辑：按照建议移动 CountryList 仍然遇到与 countryList 计数保持在 1 相同的问题。

我已经把它放在国家类的一个方法中了。

        public static void addD(country a)
    {
        Dictionary<object, string> CountryList = new Dictionary<object, string>();
        CountryList.Add(a.Country, a.GDP);


        foreach (KeyValuePair<object, string> country in CountryList)
        {
            Console.WriteLine("Country = {0}, GDP = {1}", country.Key, country.Value);
        }
    }

并从这里调用它：

            newCountry[i].TB =(columns[3]);
         newCountry[i].HDI =(columns[4]);
         newCountry[i].TP = (columns[5]);
         country.addD(newCountry[i]);

Answer 1

试试这个代码，我已经清理了它并添加了 cmets，因为它很难使用。

       static void Main(string[] args)
    {
        // Initalize the loop iterator
        int i = 0;

        // Initalize a list of country data
        country[] newCountry = new country[30];

        // Initialize a list of countries
        Dictionary<object, string> countryList = new Dictionary<object, string>();

        // Read all the lines from the file
        string[] fileLines = File.ReadAllLines(@"C:\Users\Jack\Documents\countries.csv");

        // For each line in the file
        foreach (string line in fileLines)
        {
            // Check if the line is a header
            if (line.StartsWith("Country"))
            {
                headers = line.Split(',');
            }
            else
            {
                // Split the text data
                string[] columns = line.Split(',');

                // Initalize a new country
                newCountry[i] = new country
                {
                    Country = columns[0],
                    GDP = columns[1],
                    Inflation = columns[2],
                    TB = columns[3],
                    HDI = columns[4],
                    TP = columns[5]
                };

                countryList.Add(newCountry[i].Country, string.Format("{0},{1},{2},{3},{4}", newCountry[i].GDP, newCountry[i].Inflation, newCountry[i].TB, newCountry[i].HDI, newCountry[i].TP));
                i++;
            }
        }

        // The process is done show the data
        foreach (KeyValuePair<object, string> country in countryList)
        {
            Console.WriteLine("Country = {0}, GDP = {1}", country.Key, country.Value);
        }

        // Wait for the user key
        Console.ReadKey();
    }

    public static string[] headers { get; set; }

    public class country
    {
        public string Country { get; set; }
        public string GDP { get; set; }
        public string Inflation { get; set; }
        public string TB { get; set; }
        public string HDI { get; set; }
        public string TP { get; set; }

    }

进一步更新为什么还要使用国家集合？下面是一个更好的方法

static void Main(string[] args)
{
    // Initalize a list of country data
    List<country> countryList = new List<country>();

    // Read all the lines from the file
    string[] fileLines = File.ReadAllLines(@"countries.csv");

    // For each line in the file
    foreach (string line in fileLines)
    {
        // Check if the line is a header
        if (line.StartsWith("Country"))
        {
            headers = line.Split(',');
        }
        else
        {
            // Split the text data
            string[] columns = line.Split(',');

            // Initalize a new country
            country fileCountry = new country
            {
                Country = columns[0],
                GDP = columns[1],
                Inflation = columns[2],
                TB = columns[3],
                HDI = columns[4],
                TP = columns[5]
            };

            countryList.Add(fileCountry);
        }
    }

    // The process is done show the data
    foreach (country country in countryList)
    {
        Console.WriteLine("Country = {0}, GDP = {1}", country.Country, country.GDP);
    }

    // Wait for the user key
    Console.ReadKey();
}

public static string[] headers { get; set; }

public class country
{
    public string Country { get; set; }
    public string GDP { get; set; }
    public string Inflation { get; set; }
    public string TB { get; set; }
    public string HDI { get; set; }
    public string TP { get; set; }

}

根据问题进行第二次更新，列表框是开始使用 win UI 控件的好方法，我添加了下面的示例。添加一个名为 button1 的按钮和一个名为

的列表框控件

// List holding all the country data
        private List<country> countryList;

        /// <summary>
        /// Handle the button click
        /// </summary>
        /// <param name="sender">See MSDN</param>
        /// <param name="e">See MSDN</param>
        private void button1_Click(object sender, EventArgs e)
        {
            // Initalize a list of country data
            this.countryList = new List<country>();

            // Set the display text to the display property of the country class
            this.listBox1.DisplayMember = "Display";

            // Set the value of the list box item to the current country
            this.listBox1.ValueMember = "Country";

            // Populate the data
            this.PopulateData();

            // Set the list box datasource
            this.listBox1.DataSource = this.countryList;
        }

        /// <summary>
        /// Gets the country data from the csv file
        /// </summary>
        private void PopulateData()
        {
            // Read all the lines from the file
            string[] fileLines = File.ReadAllLines(@"countries.csv");

            // For each line in the file
            foreach (string line in fileLines)
            {
                // Check if the line is a header
                if (line.StartsWith("Country"))
                {
                    headers = line.Split(',');
                }
                else
                {
                    // Split the text data
                    string[] columns = line.Split(',');

                    // Initalize a new country
                    country fileCountry = new country
                    {
                        Country = columns[0],
                        GDP = columns[1],
                        Inflation = columns[2],
                        TB = columns[3],
                        HDI = columns[4],
                        TP = columns[5]
                    };

                    this.countryList.Add(fileCountry);
                }
            }

            // The process is done show the data
            foreach (country country in this.countryList)
            {
                Console.WriteLine(country.Display);
            }
        }

        public static string[] headers { get; set; }

        public class country
        {
            public string Country { get; set; }
            public string GDP { get; set; }
            public string Inflation { get; set; }
            public string TB { get; set; }
            public string HDI { get; set; }
            public string TP { get; set; }

            /// <summary>
            /// Formats the display string for the country 
            /// </summary>
            public string Display
            {
                get
                {
                    return string.Format("Country = {0}, GDP = {1}", this.Country, this.GDP);
                }
            }
        }

Answer 2

您在 foreach 块中声明 CountryList，因此它在每次迭代结束时失去作用域，并且您在下一次迭代时从头开始重新创建它。您需要在 foreach 块之外或作为类的成员声明它。