連接未關閉錯誤

Question

運行下面的代碼時，爲什麼會出現此錯誤？這經常發生。我有到位的開放連接的支票......

System.InvalidOperationException: The connection was not closed. 
    at System.Data.EntityClient.EntityConnection.Open() 
    at Publish(Int32 reportID) 

CODE：

while (!completed && 5 >= retryCount) 
{ 
    retryCount++; 
    try 
    { 
     internalReportsEntities.CommandTimeout = (5 * 60); 
     internalReportsEntities.Publish(internalSet.ID); // publish method called 
     completed = true; 
    } 
    catch (EntityCommandExecutionException entityCommandExecutionException) 
    { 
     if (5 < retryCount) throw; 
     Utilities.ThreadUtilities.Sleep(retryCount); 
    } 
} 

public void Publish(int reportID) 
{ 
if (this.Connection.State != System.Data.ConnectionState.Open) this.Connection.Open(); 
EntityCommand publishEntityCommand = new EntityCommand 
    { 
      CommandType = CommandType.StoredProcedure, 
      CommandText = @"ReportsEntities.Publish", 
      Connection = (EntityConnection)this.Connection 
    }; 
} 

Answer 1

您將需要包裝的代碼在你的發佈方法，一個try/catch/finally塊和處置當你完成它的連接。一個很好的例子在這裏解釋：http://msdn.microsoft.com/en-gb/library/vstudio/bb738461(v=vs.100).aspx