如何訪問C＃中的其他班級成員

Question

新問題和意見：

感謝大家的建議。我實際上是從第二個線程調用SetFreq（）。我需要兩個線程。他們都在執行獨立的任務。第二個線程通過Lru_Channel_Details類共享主線程的數據。我很難理解如何在第二個線程中從Lru_SetChanFreq類訪問ChFreq數據成員。我更新了下面的代碼。我希望它解釋了我想要做的。對不起，如果不是，我很樂意澄清。

再次感謝大家的建議。

原題：

原諒我，我是新來的C＃和麪向對象編程。我無法訪問其他班級成員。我創建了其他類對象來訪問其成員字段。代碼編譯但我沒有得到任何結果，當我顯示它們。 我無法找到我的問題的答案。有人能告訴我我忽略了什麼嗎？以下是說明我的問題的代碼片段。

再次感謝您提供任何建議。

// this class I want to use the value of ChFreq from the Lru_SetChanFreq class to do some stuff for the Lru_operation class in the main thread to use 
public class Lru_Channel_Details 
{ 
    public void actualFreq() 
    { 
     Lru_operation LruOp2 = new Lru_operation(); // create main operations class object to access ChFreq  
     Lru_SetChanFreq LruSetChFreq1 = new Lru_SetChanFreq(); // (optional): create other class object to access ChFreq 

     Console.WriteLine("LruOp2.SetChanFreq.ChFreq = {0}", LruOp2.SetChanFreq.ChFreq); // fails to display the ChFreq value 
     Console.WriteLine("LruSetChFreq1.ChFreq = {0}", LruSetChFreq1.ChFreq);  // (optional:) also fails to display the value 
    } 
} 

// in this class, I have set the values of ChFreq to 405.0. the call to do this came from the Lru_Listen class which runs in a 2ndary thread. 
// this class then calls the actualFreq() from Lru_Channel_Details class. The Lru_Channel_Details class is also accessed from the Lru_operation class, 
// which is running in the main thread. 
public class Lru_SetChanFreq 
{ 
    private string chFreq; 

    public string ChFreq 
    { 
     get { return chFreq; } 
     set { chFreq = value; } 
    } 


    public void SetFreq() 
    { 
     Lru_operation LruOp1 = new Lru_operation(); // this object accesses multiple other classes 

     LruOp1.SetChanFreq.ChFreq = "405.0"; // assign this value using main operations class object 

     LruOp1.ChanDet.actualFreq(); // calls another class method to use ChFreq 

     // does stuff with LruOp1 to access other class methods (not shown) 
    } 
} 


// this is where the program begins. I'm running 2 threads concurrently and I need to share data between them. 
[STAThread] 
static void Main() 
{ 
    // starts a 2ndary thread to do stuff while the main thread is working. 
    Lru_Listen LruListen1 = new Lru_Listen(); 
    Thread LruListenThread = new Thread(new ThreadStart(LruListen1.ListenForAag)); 
    LruListenThread.Start(); 

    while(!LruListenThread.IsAlive); 
    Thread.Sleep(1); 

    Lru_operation LruOpX = new Lru_operation();   // create object to access Lru operation method 
    LruOpX.LruOperation(); 



// this class is my main operations class. it is running in the main thread. the below objects are used to access other 
// class members. it's main purpose is to take data from the Lru_Channel_Details class do some stuff on it and pass it to 
// another class. it must be running in it's own thread. 
public class Lru_operation 
{ 
    // this object is only used in other classes to access its class members. it's not used in the main operations class 
    public Lru_SetChanFreq SetChanFreq = new Lru_SetChanFreq(); 

    // this object is used in the main operations class to call methods from its class 
    public Lru_Channel_Details ChanDet = new Lru_Channel_Details(); 

    // does stuff with the above class objects' methods 

} 


// this class is running in a 2nd thread concurrently with the main thread. it needs to share other class data with the main thread. 
// it's main purpose is to do some stuff to get data then call the SetFreq() from the Lru_SetChanFreq class 
public class Lru_Listen 
{ 
    public void LruShowRequestData() 
    { 
     // do some other stuff  

     Lru_operation LruOp3 = new Lru_operation(); // create object to access set channel frequency method 
     LruOp3.SetChanFreq.SetFreq();   // here is where SetFreq() from the Lru_SetChanFreq class is called 
    } 
} 

Answer 1

你永遠不會真的調用SetFreq（）方法，所以你永遠不會有任何值。嘗試在構造函數中設置它：

public Lru_SetChanFreq() 
{ 
    this.SetFreq(); 
} 

Answer 2

你從未設置的ChFreq的值，因此，這只是它的默認值，一個空字符串。

Lru_SetChanFreq LruSetChFreq1 = new Lru_SetChanFreq(); 

// this 
LruSetChFreq1.ChFreq = "new value"; 
// or this 
LruSetChFreq1.SetFreq() 

Console.WriteLine("LruSetChFreq1.ChFreq = {0}", LruSetChFreq1.ChFreq); 

Answer 3

有兩個問題，我看到：

• 你不是叫SetFreq所以值永遠不會設置。您需要在您的Console.WriteLine報表之前實際撥打SetFreq。

• 即使你調用它，SetFreq創建的Lru_operation一個新的實例時，該方法完成運行丟失，而不只是分配值到當前的一個。從SetFreq卸下三個行代碼，並取代它們：chFreq = "405.0";

這裏是你如何可以修改代碼以取得預期的結果。你只是犯了一個簡單的錯誤。

public void actualFreq() 
{ 
    Lru_operation LruOp2 = new Lru_operation(); 
    Lru_SetChanFreq LruSetChFreq1 = new Lru_SetChanFreq(); 

    LruOp2.SetChanFreq.SetFreq(); 
    LruSetChFreq1.SetFreq(); 

    Console.WriteLine("LruOp2.SetChanFreq.ChFreq = {0}", LruOp2.SetChanFreq.ChFreq); 
    Console.WriteLine("LruSetChFreq1.ChFreq = {0}", LruSetChFreq1.ChFreq); 
}