NpgsqlException-错误：57014：由于用户请求而取消语句

Question

我正在将Npgsql与.Net应用程序一起使用，它可以正常运行，但是有些 给出以下错误。

“ NpgsqlException-错误：57014：由于用户请求而取消语句”

这是返回多个数据集的代码。在内部，我在存储过程中使用了refcursor。

public List<DataTable> ExecuteDatasetForMultipleResultset(CommandType commandType, string query, NpgsqlParameter[] npgsqlParameters, List<string> outputparameters)
{

     using (NpgsqlCommand command = GetCommand(query, npgsqlParameters, commandType))
     {
         try
           {
               List<DataTable> tables = new List<DataTable>();
               NpgsqlTransaction t = command.Connection.BeginTransaction(IsolationLevel.ReadUncommitted);
               command.ExecuteNonQuery();
               //command.CommandTimeout = 60;
               foreach (var item in outputparameters)
               {
                  string innerquery = "fetch all in \"" + item.ToString().Trim() + "\";";
                  command.CommandType = CommandType.Text;
                  command.CommandText = innerquery;
                  NpgsqlDataAdapter da = new NpgsqlDataAdapter(command);
                  DataSet myDS = new DataSet();
                  da.Fill(myDS);
                  tables.Add(myDS.Tables[0]);
               }
               t.Commit();
               return tables;
          }
          catch (Exception Ex)
          {
               throw Ex;
          }
          finally
          {
               command.Connection.Close();
          }
     }
}

异常日志：

{
    "ClassName": "Npgsql.NpgsqlException",
    "Message": "ERROR: 57014: canceling statement due to user request",
    "Data": null,
    "InnerException": null,
    "HelpURL": null,
    "StackTraceString": " at Npgsql.NpgsqlState.d__0.MoveNext()\r\n at Npgsql.ForwardsOnlyDataReader.GetNextResponseObject(Boolean cleanup)\r\n at Npgsql.ForwardsOnlyDataReader.GetNextRow(Boolean clearPending)\r\n at Npgsql.ForwardsOnlyDataReader.Read()\r\n at System.Data.Common.DataAdapter.FillLoadDataRow(SchemaMapping mapping)\r\n at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)\r\n at System.Data.Common.DataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)\r\n at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)\r\n at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)\r\n at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)\r\n at MidOfficeWebservice.NPgSQL.Npgsql_Helper.ExecuteDatasetForMultipleResultset(CommandType commandType, String query, NpgsqlParameter[] npgsqlParameters, List`1 outputparameters)",
    "RemoteStackTraceString": null,
    "RemoteStackIndex": 0,
    "ExceptionMethod": "8\nMoveNext\nNpgsql, Version=2.2.3.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7\nNpgsql.NpgsqlState+d__0\nBoolean MoveNext()",
    "HResult": -2147467259,
    "Source": "Npgsql",
    "WatsonBuckets": null,
    "errors": [{
        "Severity": "ERROR",
        "Code": "57014",
        "Message": "canceling statement due to user request",
        "Detail": "",
        "Hint": "",
        "Position": "",
        "InternalPosition": "",
        "InternalQuery": "",
        "Where": "",
        "File": "postgres.c",
        "Line": "3006",
        "Routine": "ProcessInterrupts",
        "SchemaName": "",
        "TableName": "",
        "ColumnName": "",
        "DataTypeName": "",
        "ConstraintName": "",
        "ErrorSql": "fetch all in \"tbl_brokerage_segment_sub\";"
    }]
}