I can't Read from FileText C#

本文关键字：Read from FileText can | 更新日期: 2023-09-27 18:04:05

我必须在学生、班级和学年之间建立这样的联系:一年可以有一个或多个班级，一个班级可以有一个或多个学生。

我用一个通用列表来做这个。问题是我必须从一个.txt文件中获取信息，我不知道该怎么做。

我的文件是这样的: 

(Year,Class,Name,Surname,Average).
1   314 George      Andrew  8
2   324 Popescu     Andrei  9
2   323 Andreescu   Bogdan  10
3   332 Marin       Darius  9
3   332 Constantin  Roxana  10
代码:

  public class Student
    {
        public string Name { get; set; }
        public string Surname { get; set; }
        public int Average { get; set; }
    }
}

    public class Grupa
    { 
        public int Name { get; set; }
        public List<Student> SetStudent { get; set; }
        public Grupa()
        {
            SetStudent = new List<Student>();
        }
        public void Print()
        {
            //Console.WriteLine("Grupa: " + this.Name);
            Console.WriteLine("Studentii din grupa: ");
            foreach (Student s in this.SetStudent)
            {
                Console.WriteLine(" " + s.Name+ " " + s.Surname + "  ---  " + s.Average+"'n");
            }
        }
     }
public class An
    {
        public int Anul { get; set; }
        public List<Grupa> SetGrupa { get; set; }
        public An()
        {
            SetGrupa = new List<Grupa>();
        }
        public void Print()
        {
            Console.WriteLine("Anul: " + this.Anul);
            Console.WriteLine("Grupele din acest an: ");
            foreach (Grupa g in this.SetGrupa)
            {
                Console.WriteLine(" " + g.Name);
            }
        }
              }

    string[] lines = System.IO.File.ReadAllLines(@"D:'C#'Tema1'Tema1.txt");
    System.Console.WriteLine("Content Tema1.txt= 'n");
    foreach (string line in lines)
    {
          Console.WriteLine("'t" + line);
    }
    Console.WriteLine("'n Close");
    System.Console.ReadKey();
}

I can't Read from FileText C#

对于这种类型的平面文件，您也可以使用。net TextFieldParser:

var studentList = new List<Student>();
var parser = new Microsoft.VisualBasic.FileIO.TextFieldParser("<file path>");
parser.SetFieldWidths(4, 4, 12, 8, 2);
while (!parser.EndOfData)
{
     string[] line = parser.ReadFields();
     var student = new Student();
     student.Year = int.Parse(line[0]);
     student.Class = int.Parse(line[1]);
     student.Name = line[2].Trim();
     student.Surname = line[3].Trim();
     student.Average = int.Parse(line[4]);
     studentList.Add(student);
}

您只需在SetFieldWidths函数中设置字段长度。

你的问题是一个模糊的一个，你是在寻找Linq这样:

// Parsing into objects
var data = System.IO.File
  .ReadLines(@"D:'C#'Tema1'Tema1.txt")
  .Skip(1) //TODO: comment down this line if your file doesn't have a caption
  .Select(line => line.Split(''t'))
  .Select(items => new { // or "new Student() {" if you've designed a Student class
    Year    = int.Parse(items[0]),
    Class   = int.Parse(items[1]),
    Name    = items[2],
    Surname = items[3],
    Average = int.Parse(items[4]), //TODO: Is it Int32 or Double?
  });
...
// combining back: 
String result = String.Join(Environment.NewLine, data
  .Select(item => String.Join("'t", 
     item.Year, item.Class, item.Name, item.Surname, item.Average));
Console.Write(result);

如果你想完全控制自己想做的事情，我建议为每个学生创建一个类。

一个粗略的方法:

namespace ConsoleApplication1
{
    class Student
    {
        //Members of class
        public int Year;
        public int Class;
        public string FirstName;
        public string LastName;
        public int Average;
        /// <summary>
        /// Gets a line and creates a student object
        /// </summary>
        /// <param name="line">The line to be parsed</param>
        public Student(string line)
        {
            //being parsing
            //split by space
            List<String> unfiltered = new List<string>(line.Split(' '));
            //a list to save filtered data
            List<string> filtred = new List<string>();
            //filter out empty spaces...
            //There exist much smarter ways...but this does the job 
            foreach (string entry in unfiltered)
            {
                if (!String.IsNullOrWhiteSpace(entry))
                    filtred.Add(entry);
            }
            //Set variables
            Year = Convert.ToInt32(filtred[0]);
            Class = Convert.ToInt32(filtred[1]);
            FirstName = filtred[2];
            LastName = filtred[3];
            Average = Convert.ToInt32(filtred[4]);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var data = System.IO.File.ReadAllLines(@"d:'data.txt");
            //a list to hold students
            List<Student> students = new List<Student>();
            foreach (var line in data)
            {
                //create a new student and add it to list
                students.Add(new Student(line));
            }
            //to test, write all names
            foreach (var student in students)
            {
                Console.WriteLine(student.FirstName + " " + student.LastName + Environment.NewLine);
            }
            //you can calculate average of all students averages!
            int sum = 0;
            for (int i = 0; i < students.Count; i++)
            {
                sum += students[i].Average;
            }
            //print average of all students
            Console.WriteLine("Average mark of all students: " + (sum / students.Count));
            Console.ReadKey();
        }
    }
}
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