스트림 작성기에서 for 루프 사용

Question

여러 특성을 가진 질문 개체를 만들려고합니다.이 개체는 모두 텍스트 파일에 저장되고 StreamReader를 사용하여 검색됩니다.

하나의 속성은 배열 Choices[]입니다. 변수 배열 qType의 값에 따라 배열을 채울 수 있어야합니다.

예를 들면 if qType = "button"이면 Choices[]은 파일에서 4 줄만 읽어야합니다. 반면 if qType = "dragdrop" 인 경우 Choices[]은 파일에서 6 번 읽어야합니다. 지금까지 for 루프, case 문 및 if 문을 사용해 보았습니다.이 중 모두가 중단되었습니다. 누군가가 StreamReader를 방해하지 않고 이것을 어떻게 할 수 있는지 말해 줄 수 있습니까? 작동

을 Heres 코드 : 내가 사용하고있는 전체 코드

Choices = new string[] 
{ 
    for(int i=0; i<4; i++) 
    { 
     quizFileReader.ReadLine(), // expects a ; 
    } 
}, // excepts a ; 

을 Heres :

public string QuestionText, imgPath, hintTxt; // Actual question text. 
    public string[] Choices; // Array of answers from which user can choose. 
    public int Answer, qNum, linesToRead;   // Index of correct answer within Choices. 
    public double difficulty; // Double that represents difficulty of each question 

    public List<Question> getQues() // reads questions from text file, assigns all strings in text file to index of List, returns the full list of questions 
    { 
     // Create new list to store all questions. 
     var questions = new List<Question>(); 

     // Open file containing quiz questions using StreamReader, which allows you to read text from files easily. 
     using (var quizFileReader = new System.IO.StreamReader("PhysQuestions.txt")) 
     { 
      string line; 
      Question question; 

      // Loop through the lines of the file until there are no more (the ReadLine function return null at this point). 
      // ReadLine called here only reads question texts (first line of a question), while other calls to ReadLine read the choices. 
      while ((line = quizFileReader.ReadLine()) != null) 
      { 
       // Skip this loop if the line is empty. 
       if (line.Length == 0) 
        continue; 

       // Create a new question object. 
       // The "object initializer" construct is used here by including { } after the constructor to set variables. 
       question = new Question() 
       { 
        // Set the question text to the line just read. 
        QuestionText = line, 
        linesToRead = Convert.ToInt32(quizFileReader.ReadLine()), 
        Choices = new string[linesToRead]; 
        for (int i=0; i < linesToRead; i++) 
        { 
         Choices[i] = await quizFileReader.ReadLineAsync(); 
        } 


        hintTxt = await quizFileReader.ReadLineAsync(); 
        difficulty = Convert.ToDouble(quizFileReader.ReadLine()); 
        imgPath = quizFileReader.ReadLine(); 

       }; 

       // Set correct answer to -1, this indicates that no correct answer has been found yet. 
       question.Answer = -1; 

       // Check each choice to see if it begins with the '!' char (marked as correct). 
       for (int i = 0; i < 4; i++) 
       { 
        if (question.Choices[i].StartsWith("!")) 
        { 
         // Current choice is marked as correct. Therefore remove the '!' from the start of the text and store the index of this choice as the correct answer. 
         question.Choices[i] = question.Choices[i].Substring(1); 
         question.Answer = i; 
         break; // Stop looking through the choices. 
        } 
       } 

       // Check if none of the choices was marked as correct. If this is the case, we throw an exception and then stop processing. 
       if (question.Answer == -1) 
       { 
        throw new InvalidOperationException(
         "No correct answer was specified for the following question.\r\n\r\n" + question.QuestionText); 
       } 






       // Finally, add the question to the complete list of questions. 
       questions.Add(question); 
      } 

      return questions; 
     } 
    } 

다음

using (var quizFileReader = new System.IO.StreamReader("PhysQuestions.txt")) 
{ 
    string line; 
    Question question; 

    // Loop through the lines of the file until there are no more (the ReadLine function return null at this point). 
    // ReadLine called here only reads question texts (first line of a question), while other calls to ReadLine read the choices. 
    while ((line = quizFileReader.ReadLine()) != null) 
    { 
     // Skip this loop if the line is empty. 
     if (line.Length == 0) 
      continue; 

     // Create a new question object. 
     // The "object initializer" construct is used here by including { } after the constructor to set variables. 
     question = new Question() 
     { 
      // Set the question text to the line just read. 
      QuestionText = line, 
      qType = quizFileReader.ReadLine(), 
      // Set the choices to an array containing the next 4 lines read from the file. 
      Choices = new string[] 
      { 
       quizFileReader.ReadLine(), 
       quizFileReader.ReadLine(), 
       quizFileReader.ReadLine(), 
       quizFileReader.ReadLine(), 
      }, 

      hintTxt = quizFileReader.ReadLine(), 
      difficulty = Convert.ToDouble(quizFileReader.ReadLine()), 
      imgPath = quizFileReader.ReadLine() 
     }; 
    } 
} 

내가 작동하지 않습니다 그렇게하려고 노력 뭔가

Answer 1

몇 줄을 읽고 싶은지 알고 나면 다음과 비슷한 것을하십시오 :

using (var quizFileReader = new System.IO.StreamReader("PhysQuestions.txt")) 
{ 
    Question question; 
    int linesToRead = 4; 
    string[] choices = new string[linesToRead]; 

    for (int i=0; i < linesToRead; i++) 
    { 
     choices[i] = await quizFileReader.ReadLineAsync(); 
    } 
} 

올바른 방향으로 시작해야하지만 어딘가에 갇혀 있으면 알려주세요.

ReadLine을 비동기 버전으로 변환하여 차단하지 않았습니다.