File.ReadAllLines问题 [英] File.ReadAllLines problems

问题描述

大家好。

我写了一个简单的代码，可以保存你的成绩，但我无法阅读它们并保存所有以前的输入。我不知道如何正确使用File.ReadAllLines，因此它读取数据并保存，以后我无法添加新的成绩。现在每当
我启动程序并把新成绩放弃时，旧的成绩会消失。

使用System; 
使用System.Collections.Generic; 
使用System.Linq; 
使用System.IO; 
使用System.Text; 
 
 namespace ConsoleApplication1 
 {
 class program 
 {
 static int ReadGrade（）
 {
 int x; 
 try 
 {
 x = Convert.ToInt32（Console.ReadLine（））; 
 if（x< 1 || x> 6）
 {
抛出新的ApplicationException（"''无效输入！'"）; 
} 
} 
 
 catch（例外e）
 {
 Console.WriteLine（" Error" + e.Message）; 
 x = 0; 
} 
返回x; 
} 
 
 static float mtlGrade（float [] x）
 {
 float mw = x [0]; 
 for（int i = 1; i< x.Length; i ++）mw + = x [i]; 
返回mw / x.Length; 
} 
 
 static void Main（string [] args）
 {
 int amRest = 3; //金额休息
 int amTes = 4; // amout test 
 float [] help = new float [amTes]; 
 
 // subject 
 string [] subjects = {" German"，"English"，"Math"，"ITS"，"SA"，"Sport"等。 ，"宗教"，
"Politik"，"WL"，"Electrotechnik"}; 
 int [，] test = new int [subjects.Length，amTes]; 
 int [，] rest = new int [subjects.Length，amRest]; 
 
 string path = @" c：\ temp" ;; 
 //读取数据
 if（File.Exists（path +" \\" +" MatFlo.csv"））
 {
 string [] readText = File.ReadAllLines（path +" \\" +" MatFlo.csv"，Encoding.UTF8）; 
 string [] row; 
 //将所有数据保存在"s"中
 foreach（readText中的字符串s）
 {
 //保存数据
 for（int i = 0; i< subjects.Length; i ++）
 {
 row = s.Split（';'）; 
 subject [i] = row [0]; 
 for（int j = 0; j< amTes; j ++）test [i，j] = Convert.ToInt32（row [j + 1]）; 
 for（int k = 4; k< amRest; k ++）rest [i，k] = Convert.ToInt32（row [k + 1]）; 
 
 Console.WriteLine（s）; 
 
} 
} 
} 
 Console.Clear（）; 
 
 //列出主题
 for（int i = 0; i< 10; i ++）
 {
 if（i< 9）
 {
 Console.WriteLine（（i + 1）+"：" + subjects [i]）; 
} 
 else 
 {
 Console.WriteLine（（i + 1）+"：" + subjects [i]）; 
} 
} 
 //选择主题
 int subject; //主题的数量
 subject = Convert.ToInt32（Console.ReadLine（））;学科 - ; 
 Console.Clear（）; 
 Console.WriteLine（" Du hast das subject" subject [subject] +"gewählt！" +" \ n"）; 
 
 //输入测试
 for（int i = 0; i< amTes; i ++）
 {
 Console.Write（（i + 1）+" ; Klausur注："）; 
 test [subject，i] = ReadGrade（）; 
 help [i] = test [subject，i]; 
} 
 Console.WriteLine（" \ n"）; 
 
 //输入休息
 for（int i = 0; i< amRest; i ++）
 {
 Console.Write（（i + 1）+" ; restige注："）; 
 rest [subject，i] = ReadGrade（）; 
 help [i] = test [subject，i]; 
} 
 
 
 float avarageTes = 0; 
 float avarageRest = 0; 
 // avarage of Test 
 for（int i = 0; i< amTes; i ++）
 {
 avarageTes + = test [subject，i]; 
} 
 avarageTes / = amTes; 
 //平均休息
 for（int i = 0; i< amRest; i ++）
 {
 avarageRest + = rest [subject，i]; 
} 
 avarageRest / = amRest; 
 // avarage all 
 double avarage =（avarageRest * 0.5）+（avarageTes * 0.5）; 
 Console.WriteLine（"你的等级平均值是+ + avarage）; 
 Console.ReadLine（）; 
 
 string [] createText = new string [subjects.Length]; 
 
 
 for（int i = 0; i< subjects.Length; ++ i）
 {
 createText [i] =臣[i]; 
 for（int j = 0; j< amTes; j ++）createText [i] + =（" ;;" + test [i，j]）; 
 
 for（int j = 0; j< amRest; j ++）createText [i] + =（" ;;" + rest [i，j]）; 
} 
 File.WriteAllLines（路径+" \\" +" MatFlo.csv"，createText，Encoding.UTF8）; 
 
 
} 
} 
} 
 
 

解决方案

你好，

注意 

文件。追加全部线（）

Hello everybody

I wrote a simple code which allows you to save your grades but i can't get to read them and save all the previous inputs. I don't know how to use the File.ReadAllLines properly so it reads the data and saves it and later i can't add new grades. Now whenever i start the program and put new grades the old ones disapear.

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static int ReadGrade()
        {
            int x;
            try
            {
                x = Convert.ToInt32(Console.ReadLine());
                if (x < 1 || x > 6)
                {
                    throw new ApplicationException("'Invalid input!'");
                }
            }

            catch (Exception e)
            {
                Console.WriteLine("Error " + e.Message);
                x = 0;
            }
            return x;
        }

        static float mtlGrade(float[] x)
        {
            float mw = x[0];
            for (int i = 1; i < x.Length; i++) mw += x[i];
            return mw / x.Length;
        }

        static void Main(string[] args)
        {
            int amRest = 3; // amount rest
            int amTes = 4; // amout test
            float[] help = new float[amTes];

            //subjects
            string[] subjects = {"German", "English", "Math", "ITS", "SA", "Sport", "Religion", 
						       "Politik", "WL", "Electrotechnik"};
            int[,] test = new int[subjects.Length, amTes];
            int[,] rest = new int[subjects.Length, amRest];

            string path = @"c:\temp";
            //read data
            if (File.Exists(path + "\\" + "MatFlo.csv"))
            {
                string[] readText = File.ReadAllLines(path + "\\" + "MatFlo.csv", Encoding.UTF8);
                string[] row;
                //save all data in "s"
                foreach (string s in readText)
                {
                    //save data
                    for (int i = 0; i < subjects.Length; i++)
                    {
                        row = s.Split(';');
                        subjects[i] = row[0];
                        for (int j = 0; j < amTes; j++) test[i, j] = Convert.ToInt32(row[j + 1]);
                        for (int k = 4; k < amRest; k++) rest[i, k] = Convert.ToInt32(row[k + 1]);

                        Console.WriteLine(s);

                    }
                }
            }
            Console.Clear();
            
            //list subjects
            for (int i = 0; i < 10; i++)
            {
                if (i < 9)
                {
                    Console.WriteLine((i + 1) + "  :" + subjects[i]);
                }
                else
                {
                    Console.WriteLine((i + 1) + " :" + subjects[i]);
                }
            }
            //choose subject
            int subject; //number of the subject
            subject = Convert.ToInt32(Console.ReadLine()); subject--;
            Console.Clear();
            Console.WriteLine("Du hast das subject " + subjects[subject] + " gewählt!" + "\n");

            //input test
            for (int i = 0; i < amTes; i++)
            {
                Console.Write((i + 1) + " Klausur Note :");
                test[subject, i] = ReadGrade();
                help[i] = test[subject, i];
            }
            Console.WriteLine("\n");

            //input rest
            for (int i = 0; i < amRest; i++)
            {
                Console.Write((i + 1) + " restige Note :");
                rest[subject, i] = ReadGrade();
                help[i] = test[subject, i];
            }


            float avarageTes = 0;
            float avarageRest = 0;
            //avarage of Test
            for (int i = 0; i < amTes; i++)
            {
                avarageTes += test[subject, i];
            }
            avarageTes /= amTes;
            //avarage of rest
            for (int i = 0; i < amRest; i++)
            {
                avarageRest += rest[subject, i];
            }
            avarageRest /= amRest;
            //avarage all
            double avarage = (avarageRest * 0.5) + (avarageTes * 0.5);
            Console.WriteLine("Your grade avarage is " + avarage);
            Console.ReadLine();

            string[] createText = new string[subjects.Length];
           
  
            for (int i = 0; i < subjects.Length; ++i)
            {
                createText[i] = subjects[i];
                for (int j = 0; j < amTes; j++) createText[i] += (";" + test[i, j]);

                for (int j = 0; j < amRest; j++) createText[i] += (";" + rest[i, j]);
            }
                File.WriteAllLines(path + "\\" + "MatFlo.csv", createText, Encoding.UTF8);

            
        }
     }
}

解决方案

Hello,

Pay attention to 

File.AppendAllLines()

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