如何在C＃中實現對自定義函數的處理？

Question

我有下面列出的示例類，每次調用API時，都需要使用CreateDataConnection（）打開數據庫連接。

public class FlowerController : ApiController
    {
        DataConnection oDataConnection { get; set; }
        public void CreateDataConnection() 
        {
            ConnectionParameters oParams = new ConnectionParameters();

            oParams.strDatabaseName = "123123123123";
            oParams.strPassword = "123123123123";  
            oParams.strSchemaName = "123123123123";
            oParams.strServerIP = "192.168.1.1";
            oParams.strServerPort = "12313";
            oParams.strUsername = "123123123";
            oDataConnection = new DataConnection(oParams);
        }

        [HttpPost]
        [AllowAnonymous]
        [Route("api/flower/Activate")]
        public DBStatus Activate(W_Flower oFlower)
        {
            CreateDataConnection();
            DBStatus result = oDataConnection.Activate(oFlower);
            return result;
        }
}

我想如下實現Activate API

public DBStatus Activate(W_Flower oFlower)
{
   using (CreateDataConnection())
   {
       DBStatus result = oDataConnection.Activate(oFlower);
   }
   return result;
}

但這不起作用，因為我在CreateDataConnection中沒有dispose方法。 我如何在這里實施處置？ 我以前沒有做過這種方法。

Answer 1

更改CreateDataConnection以返回新創建的連接，

public DataConnection CreateDataConnection() {
    ConnectionParameters oParams = new ConnectionParameters();

    oParams.strDatabaseName = "123123123123";
    oParams.strPassword = "123123123123";  
    oParams.strSchemaName = "123123123123";
    oParams.strServerIP = "192.168.1.1";
    oParams.strServerPort = "12313";
    oParams.strUsername = "123123123";
    return new DataConnection(oParams);
}

而不是將其存儲在屬性中。

那你就可以做

public DBStatus Activate(W_Flower oFlower) {
   using (var connection = CreateDataConnection()) {
       return connection.Activate(oFlower);
   }
}

Answer 2

這應該有助於：

public class SomeClass : IDisposable
{
    #region IDisposable Support
    private bool disposedValue = false; // To detect redundant calls

    protected virtual void Dispose(bool disposing)
    {
        if (!disposedValue)
        {
            if (disposing)
            {
                // TODO: dispose managed state (managed objects).
            }

            // TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
            // TODO: set large fields to null.

            disposedValue = true;
        }
    }

    // TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
    // ~SomeClass() {
    //   // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
    //   Dispose(false);
    // }

    // This code added to correctly implement the disposable pattern.
    public void Dispose()
    {
        // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
        Dispose(true);
        // TODO: uncomment the following line if the finalizer is overridden above.
        // GC.SuppressFinalize(this);
    }
    #endregion
}

Answer 3

您可以通過以下方式實現它：

public class MyClass : IDisposable
{
    bool disposed;

    protected virtual void Dispose(bool disposing)
    {
        if (!disposed)
        {
            if (disposing)
            {
                //dispose managed resources
            }
        }
        //dispose unmanaged resources
        disposed = true;
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

Answer 4

您需要實現IDisposable接口，之后，您可以使用Dispose方法，只需在Dispose中編寫自己的邏輯即可。