File.ReadAllLines问题

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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()