我可以在這段代碼中以某種方式替換Initial塊（）和Close（）方法調用嗎？

Question

有沒有辦法可以建議幫助擺脫調用Initialize（）和Close（）方法並將其替換爲使用塊？

或者這種方法完全沒問題？

（想法是確保作家將被處置時FooWriter的消費者寫一些字符串，並用它完成。）

class Program 
    { 
     static void Main(string[] args) 
     { 
      var writer = new FooWriter(); 

      writer.Initialize(); 

      foreach (var s in args) 
       writer.Write(s); 

      writer.Cose(); 
    } 


public class FooWriter 
{ 

    public StreamWriter Writer; 

    public void Initialize() 
    { 
     Writer = new StreamWriter("MyFile.txt", false); 
    } 

    public void Write(string line) 
    { 
     if(Writer==null) 
      throw new NullReferenceException(Writer, "Writer"); // Guard Writer 

     Writer.WriteLine(line); 
    } 

    public void Close() 
    { 
     Writer.Dispose(); 
    } 

} 

Answer 1

你可以做到這一點使你FooWriter的IDisposable。和移動初始化到它的構造：

public class FooWriter : IDisposable { 

    public StreamWriter Writer; 

    public FooWriter() 
    { 
     Writer = new StreamWriter("MyFile.txt", false); 
    } 

    public void Write(string line) 
    { 
     // You do not need to guard the writer, because constructor sets it 
     if(Writer==null) 
      throw new NullReferenceException(Writer, "Writer"); // Guard Writer 

     Writer.WriteLine(line); 
    } 

    public void Dispose() 
    { 
     Writer.Dispose(); 
    } 

} 

Answer 2

可以使FooWriter實現IDisposable，並在構造函數中調用初始化（），那麼你可以使用方式如下：

class FooWriter : IDisposable 
{ 
    private StreamWriter Writer; 
    public FooWriter() 
    { 
     Writer = new StreamWriter("MyFile.txt", false); 
    } 
    public void Write(string line) 
    { 
    Writer.WriteLine(line); 
    } 
    public void Dispose() 
    { 
     Writer.Dispose(); 
    } 
} 


// use it 

using (var writer = new FooWriter()) 
{ 
    foreach (var s in args) 
       writer.Write(s); 
} 

Answer 3

我會改變你的實現像這樣：

• 使類實現IDisposable
• 初始化作家在構造

• 刪除異常

  公共類FooWriter：IDisposable的 { 公共StreamWriter的作家{獲得;私人設置; }

  public FooWriter(string fileName) 
  { 
      Writer = new StreamWriter(fileName, false); 
  } 
  
  public void Write(string line) 
  {       
      Writer.WriteLine(line); 
  }  
  
  public void Dispose() 
  { 
      Dispose(true); 
      GC.SuppressFinalize(this); 
  } 
  
  protected virtual void Dispose(bool disposeManaged) 
  { 
      if (disposeManaged) 
       Writer.Dispose(); 
  } 
  

  }