如何使用ReadLine讀取多行文件

Question

我有這個代碼，我從中獲取用戶數據以創建車輛對象。唯一的問題是，因爲它們是不同的數據類型，我要求我必須在Read和ReadLine之間切換。當代碼到達ReadLine部分時，它會打印出我的所有WriteLine語句，而不是隻等待第一個輸入。

代碼：

Console.Write("What would you like to do? "); 
s = Console.ReadLine(); 
if (s == "1") 
{ 
    Console.Write("Please Enter the vehicle ID: \n"); 
    ID = Console.Read(); 
    Console.Write("Please enter the vehicle make: \n"); 
    make = Console.ReadLine(); 
    Console.Write("Please enter the vehicle model: \n"); 
    model = Console.ReadLine(); 

    Console.Write("Please enter the vehicle year: \n"); 
    year = Console.Read(); 

    Vehicle v; 
    v = new Vehicle 
    { 
     Id = ID, 
     Make = make, 
     Model = model, 
     Year = year 
    }; 

    Create(v); 
} 

輸出：

Please enter the vehicle ID: 
Input: 123 

Please enter the Vehicle make: 

Please enter the Vehicle model: 

這裏是我的類定義的要求，在意見：

public class Vehicle 
{ 
    public int Id { get; set; } 
    public int Year { get; set; } 
    public string Make { get; set; } 
    public string Model { get; set; } 
    public static string Class { get; set; } 

    public interface VehicleService 
    { 
     List<Vehicle> Get(); 
     Vehicle Get(int id); 
     void Create(Vehicle vehicle); 
     void Update(Vehicle vehicle); 
     void Delete(Vehicle vehicle); 
    } 
} 

任何幫助將不勝感激。

Answer 1

看來你剛開始學習編碼。以下是你需要做的新手。嘗試投入時間瞭解下面的代碼並嘗試改進。你沒有顯示對象成員的數據類型，所以我完成了一個假設。

static void Test1() 
{ 
    string s = "", make = "", model = ""; 
    int ID, year; 

    Console.Write("What would you like to do ? Enter option between 1 or 2 : "); 
    //Console.ReadLine() will take the all the characters typed by the user before enter key is hit. 
    //These characters will be assigned to a string s. 
    //If you want to read next character use Console.Read(). 
    //Note: Its returns an int rather than byte or string. 
    //since your if condition matches it with "1", you can use ReadLine() 

    s = Console.ReadLine(); 
    if (s == "1") 
    { 
     string consoleLine; 
     bool validInput = false; 

     //you can create a function for the validation and re-enter 
     do 
     { 
      Console.WriteLine("Enter the vehicle ID: "); 
      consoleLine = Console.ReadLine(); 
      //check for validity 
      if (int.TryParse(consoleLine, out ID)) 
      { 
       //assuming ID should be between 1 and 10 
       if (ID > 0 && ID < 11) 
       { 
        validInput = true; 
       } 
       else 
        Console.Write("Vehicle ID should be between 1 and 10. Re-"); 
      } 
      else 
      { 
       Console.WriteLine("Vehicle ID should be an integer. Re-"); 
      } 
     } while (!validInput); 

     validInput = false; 
     do 
     { 
      Console.WriteLine("Enter the Year: "); 
      consoleLine = Console.ReadLine(); 
      //check for validity 
      if (int.TryParse(consoleLine, out year)) 
      { 
       //assuming ID should be between 1 and 10 
       if (year > 0 && year < 2021) 
       { 
        validInput = true; 
       } 
       else 
        Console.Write("Year should be between 1 and 2020. Re-"); 
      } 
      else 
      { 
       Console.WriteLine("Year should be an integer. Re-"); 
      } 
     } while (!validInput); 

     validInput = false; 
     do 
     { 
      Console.WriteLine("Enter the vehicle make: "); 
      make = Console.ReadLine(); 

      if (make.Length > 0) 
      { 
       validInput = true; 
      } 
      else 
       Console.Write("Vehicle Make should be a valid text. Re-"); 
     } while (!validInput); 

     validInput = false; 
     do 
     { 
      Console.WriteLine("Enter the vehicle model: "); 
      model = Console.ReadLine(); 

      if (model.Length > 0) 
      { 
       validInput = true; 
      } 
      else 
       Console.Write("Vehicle Model should be a valid text. Re-"); 
     } while (!validInput); 


     //here you have received all input 
     //now assign to Vehicle 
     var vehicle = new Vehicle 
     { 
      Id = ID, 
      Make = make, 
      Year = year, 
      Model = model 
     }; 

     //Below code shows you that values are stored in the object vehicle 
     Console.WriteLine("Vehicle details stored in the object vehicle"); 
     Console.WriteLine("Vehicle Id = " + vehicle.Id.ToString()); 
     Console.WriteLine("Vehicle Year = " + vehicle.Year.ToString()); 
     Console.WriteLine("Vehicle Make = " + vehicle.Make); 
     Console.WriteLine("Vehicle Model = " + vehicle.Model); 

     //You have not shown where you have declared the List<Vehicle> to 
     //store the collection of Vehicles. 
     //You might have implemented VehicleService. So you need to search the 
     //Id in the List of Vehicle and if found use Update() else use Create() 
     //through the service implementation. 
    } 

    Console.WriteLine("Done. Press enter to Exit."); 
    Console.ReadKey(); 
} 

Answer 2

您應該使用Console.ReadLine();而不是Console.Read();，您可以通過difference-between-console-read-and-console-readline

發現他們的不同如果你仍然想使用Console.Read();請使用FlushKeyboard() method。

private static void FlushKeyboard() 
{ 
    while (Console.In.Peek() != -1) 
     Console.In.Read(); 
} 

，並呼籲Console.Read();

Console.Write("What would you like to do? "); 
s = Console.ReadLine(); 
if (s == "1") 
{ 
    Console.Write("Please Enter the vehicle ID: \n"); 
    ID = Console.Read(); 
    FlushKeyboard(); 
    Console.Write("Please enter the vehicle make: \n"); 
    make = Console.ReadLine(); 
    Console.Write("Please enter the vehicle model: \n"); 
    model = Console.ReadLine(); 

    Console.Write("Please enter the vehicle year: \n"); 
    year = Console.Read(); 
    FlushKeyboard(); 

    Vehicle v; 
    v = new Vehicle 
    { 
     Id = ID, 
     Make = make, 
     Model = model, 
     Year = year 
    }; 
    Create(v); 
}