当使用流读取器时，我的方法只读取文件

Question

中的一行，而（！String.IsNullOrEmpty（tempString = streamReader.ReadLine（）））此循环只迭代一次。任何帮助表示赞赏。全部方法：

public static ArrayList Load() 
    { 
     ArrayList vehicles = new ArrayList(); 
     FileStream file = new FileStream(Constants.fileName, FileMode.OpenOrCreate); 
     StreamReader streamReader = new StreamReader(file); 

     String typeOfVehicle = " "; 
     String model = " "; 
     String manufactuer = " "; 
     Int32 year = 0; 
     Int32 vin = 0; 
     Double price = 0; 
     String purchaseDate = " "; 
     Int32 currentOdometerReading = 0; 
     Double sizeOfEngine = 0; 
     String typeOfMotorCycle = " "; 
     Int32 numOfDoors = 0; 
     String typeOfFuel = " "; 
     Double cargoCapacity = 0; 
     Double towingCapacity = 0; 

     String tempString = " "; 

     while (!String.IsNullOrEmpty(tempString = streamReader.ReadLine())) 
     { 
      String[] split = tempString.Split('~'); 
      typeOfVehicle = split[0]; 
      manufactuer = split[1]; 
      model = split[2]; 
      year = Convert.ToInt32(split[3]); 
      vin = Convert.ToInt32(split[4]); 
      price = Convert.ToDouble(split[5]); 
      purchaseDate = split[6]; 
      currentOdometerReading = Convert.ToInt32(split[7]); 
      sizeOfEngine = Convert.ToDouble(split[8]); 

      if (typeOfVehicle == "Automobile") 
      { 
       numOfDoors = Convert.ToInt32(split[9]); 
       typeOfFuel = split[10]; 
       Automobile car = new Automobile(manufactuer, model, year, vin, price, purchaseDate, currentOdometerReading, sizeOfEngine, numOfDoors, typeOfFuel); 
       VehicleCount.IncreaseCarCount(); 
       vehicles.Add(car); 
      } 
      else if (typeOfVehicle == "Motorcycle") 
      { 
       typeOfMotorCycle = split[9]; 
       Motorcycle bike = new Motorcycle(manufactuer, model, year, vin, price, purchaseDate, currentOdometerReading, sizeOfEngine, typeOfMotorCycle); 
       VehicleCount.IncreaseBikeCount(); 
       vehicles.Add(bike); 
      } 
      else 
      { 
       cargoCapacity = Convert.ToDouble(split[9]); 
       towingCapacity = Convert.ToDouble(split[10]); 
       Truck truck = new Truck(manufactuer, model, year, vin, price, purchaseDate, currentOdometerReading, sizeOfEngine, cargoCapacity, towingCapacity); 
       VehicleCount.IncreaseTruckCount(); 
       vehicles.Add(truck); 
      } 
     } 

     streamReader.Close(); 

     return vehicles; 
    } 

Answer 1

请尝试以下。

while ((tempString = streamReader.ReadLine()) != null) 
{ 
    // ... 
} 

问题与您当前的代码是循环退出，一旦遇到一个空行

(!String.IsNullOrEmpty(tempString = streamReader.ReadLine())) 

Answer 2

尝试......

using (StreamReader streamReader = new StreamReader(file)) 
{ 
    string tempString ; 
    while ((tempString = streamReader .ReadLine()) != null) 
    { 

    } 
}