CS0103: 当前上下文中不存在名称,大家快来帮忙看看

Question

IsRunning之前就被声明为 private bool IsRunning;了,为什么还是说不存在??求各位大哥大姐帮帮小弟!~编译错误
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。编译器错误消息: CS0103: 当前上下文中不存在名称“IsRunning”源错误:行 114:       get
行 115:       {
行 116:         if(IsRunning)
行 117:         {
行 118:           return "The engine is running.";
------------------------------------------------------------------------------------------------------------
<script language="C#" runat="server">
   public class Car
   {
     private string color;
     private int gear;
     private Engine engine;     public Engine objEngine
   {
      get
      {
        return engine;
      }
      set
      {
        engine=value;
       }
    }
    public string Color
    {
      get
      {
        return color;
      }
      set
      {
        color=value;
      }
    }
    public int Gear
    {
      get
      {
        return gear;
      }
      set
      {
        gear=value;
      }
    }
    public void ChangeGear(int Direction)
    {
       if(Direction>0)
       {
         gear++;
       }
       if(Direction<0)
       {
         gear--;
       }
       if(gear>5)
       {
         gear=5;
        }
       if(gear<-1)
       {
         gear=-1;
       }
    }
         
}
  public class Engine
  {
      
      private string serialNo;
      private string rpm;
      private string name;
      private bool IsRunning;    public Engine(string Name, string Rpm, string SerialNo)
    {
      name=Name;
      rpm=Rpm;
      serialNo=SerialNo;
    }
      public void SwitchOn(Engine EngineName)
      {
      if(EngineName.name=="Ferrari" && EngineName.rpm=="050" && EngineName.serialNo=="V10")
          IsRunning=true;
       else
       IsRunning=false;
   
      }
      public void SwitchOff()
      {
       IsRunning=false;
      
      }
      public string Name
      {
        get
        {
          return name;
        }
      }
      public string Rpm
      {
        get
        {
          return rpm;
        }
      }
      public string SerialNo
      {
        get
        {
          return serialNo;
        }
      }
}        public string ISRunning
     {
       get
       {
         if(IsRunning)
         {
           return "The engine is running.";
          }
         else
         {
           return "The engine is not running.";
          }
       }
   }
public void Page_Load()
{  Engine AlexEngine=new Engine("Fdd","060","V3");
  Engine RobEngine=new Engine("Ferrari","050","V1");
  Engine MyEngine=new Engine("Xeer","070","V6");
  
  Car MyCar=new Car();
  Response.Write("<b>New object 'MyCar' created.</b>");
  
     Response.Write("<hr>Attempting to start MyCar with AlexEngine:");
     MyCar.objEngine.SwitchOn(AlexEngine);//用IgnitionName启动ignition属性
     Response.Write(MyCar.objEngine.Name);
     
     Response.Write("<hr>Attempting to start MyCar with RobEngine:");
     MyCar.objEngine.SwitchOn(RobEngine);//用IgnitionName启动ignition属性
     Response.Write(MyCar.objEngine.Name);
     
     Response.Write("<hr>Attempting to start MyCar with MyEngine:");
     MyCar.objEngine.SwitchOn(MyEngine);//用IgnitionName启动ignition属性
     Response.Write(MyCar.objEngine.Name);
     
     MyCar.objEngine.SwitchOff();//关掉引擎  
}
</script> 

Answer 1

IsRunning  定义变量的时候首字母最好小写
跟属性区别开来，你试下看看呢

Answer 2

IsRunning  定义变量的时候首字母最好小写
跟属性区别开来，你试下看看呢

Answer 3

你定义的时候需要实例化。比如private bool IsRunning = false；

Answer 4

你得这样写:
private bool _IsRunning = false;
public string ISRunning
     {
       get
       {
         if(_IsRunning)
         {
           return "The engine is running.";
          }
         else
         {
           return "The engine is not running.";
          }
       }

Answer 5

class 下看到
      private string color;
     private int gear;
     private Engine engine;没见你说的private bool IsRunning;呀

Answer 6

public string ISRunning
     {
       get
       {
         if(IsRunning)
         {
           return "The engine is running.";
          }
         else
         {
           return "The engine is not running.";
          }
       }
   }
放到类Engine里面去，不然怎么找的到

Answer 7

public class Engine
  {
      
      private string serialNo;
      private string rpm;
      private string name;
      private bool IsRunning;    public Engine(string Name, string Rpm, string SerialNo)
    {
      name=Name;
      rpm=Rpm;
      serialNo=SerialNo;
    }
      public void SwitchOn(Engine EngineName)
      {
      if(EngineName.name=="Ferrari" && EngineName.rpm=="050" && EngineName.serialNo=="V10")
          IsRunning=true;
       else
       IsRunning=false;
   
      }
      public void SwitchOff()
      {
       IsRunning=false;
      
      }
      public string Name
      {
        get
        {
          return name;
        }
      }
      public string Rpm
      {
        get
        {
          return rpm;
        }
      }
      public string SerialNo
      {
        get
        {
          return serialNo;
        }
      }
//}这个大括号的位置不对        public string ISRunning
     {
       get
       {
         if(IsRunning)
         {
           return "The engine is running.";
          }
         else
         {
           return "The engine is not running.";
          }
       }
   }
}//Engine类应该是在这里结束才对
 

Answer 8

呵呵,还真没放进去阿,不过又产生一个问题: 未将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。源错误:行 136:  
行 137:     Response.Write("<hr>Attempting to start MyCar with AlexEngine:");
行 138:     MyCar.objEngine.SwitchOn(AlexEngine);
行 139:     Response.Write(MyCar.objEngine.Name);

Answer 9

Car MyCar=new Car();
  Response.Write("<b>New object 'MyCar' created.</b>");
  
     Response.Write("<hr>Attempting to start MyCar with AlexEngine:");
     MyCar.objEngine.SwitchOn(AlexEngine);//用IgnitionName启动ignition属性
     Response.Write(MyCar.objEngine.Name);从代码来看：
MyCar的objEngine没有赋值，后面就直接MyCar.objEngine.SwitchOn(AlexEngine）了，当然要报异常了

Answer 10

怎么赋值阿?这样怎么不行?
  Engine AlexEngine=new Engine("Fdd","060","V3");
  Engine RobEngine=new Engine("Ferrari","050","V1");
  Engine MyEngine=new Engine("Xeer","070","V6");
  
  Car MyCar=new Car();
  Response.Write("<b>New object 'MyCar' created.</b>");
  MyCar.objEngine.Name="Xeer";
  MyCar.objEngine.Rpm="070";
  MyCar.objEngine.SerialNo="V6";
     Response.Write("<hr>Attempting to start MyCar with AlexEngine:");
     
     MyCar.objEngine.SwitchOn(AlexEngine);
     Response.Write(MyCar.objEngine.Name);