Question

由于我之前使用OleDbDataReader从Excel电子表格中提取数据，因此不确定是怎么回事，但突然间我的C＃批处理作业没有通过while(_reader.Reader())循环停在空白行。

这是我正在使用的C＃代码。我只是试图从Excel电子表格中提取所有记录并立即循环访问数据。但是，出于某种原因，无论如何，_reader.Read()函数都会返回true。

    private static OleDbDataReader _reader;
    static void Main(string[] args)
    {
        string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source= \\prdhilfs03\l&i-sales&mkt\WORKAREA\Agencyservices\Shared\AIC\Analysts_and_Reporting\Realignments\2014\MassUpdateTesting\Validate\ZipCodeTest.xlsx;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
        string queryString = "SELECT * FROM [Query1$]";

        Validation validation;
        ZipCodeTerritory record;

        bool flag = true;
        try
        {
            Stopwatch watch = new Stopwatch();
            watch.Start();

            using (OleDbConnection connection = new OleDbConnection(connString))
            {
                //Set connection objects to pull from spreadsheet
                OleDbCommand command = new OleDbCommand(queryString, connection);
                connection.Open();
                _reader = command.ExecuteReader();

                //Instantiate validation object with zip and channel values
                _allRecords = GetRecords();
                validation = new Validation();
                validation.SetLists(_allRecords);

                while (_reader.Read())
                {
                    record = new ZipCodeTerritory();
                    record.ChannelCode = _reader[0].ToString();
                    record.DrmTerrDesc = _reader[1].ToString();
                    record.IndDistrnId = _reader[2].ToString();
                    record.StateCode = _reader[3].ToString().Trim();
                    record.ZipCode = _reader[4].ToString().Trim();
                    record.EndDate = Convert.ToDateTime(_reader[5].ToString());
                    record.EffectiveDate = Convert.ToDateTime(_reader[6].ToString());
                    record.LastUpdateId = _reader[7].ToString();
                    record.ErrorCodes = _reader[8].ToString();
                    record.Status = _reader[9].ToString();
                    record.LastUpdateDate = DateTime.Now;


                    if (string.IsNullOrEmpty(record.LastUpdateId))
                    {
                        //Add to error list
                        _issues++;
                        _errorList.Add(record, "Missing last update Id");
                        continue;
                    }

                    if (_reader[10] != DBNull.Value)
                    {
                        record.Id = Convert.ToInt32(_reader[10]);
                    }

                    _errorMsg = validation.ValidateZipCode(record);

                    if (!string.IsNullOrWhiteSpace(_errorMsg))
                    {
                        _errorList.Add(record, _errorMsg);
                        continue;
                    }
                    else if (flag)
                    {
                        //Separate updates to appropriate list
                        SendToUpdates(record);
                    }

                    //Console.WriteLine(record.Id.ToString());
                }

我在堆栈溢出时发现this question，并尝试通过将queryString更改为以下内容来关注所选答案。但是，当OleDbException运行其OleDbCommand方法时，这只会引发.ExecuteReader()。（异常的Message属性为“没有给出一个或多个必需参数的值”）

SELECT * FROM [Query1$] WHERE NOT ([ChannelCode] = '' and [DrmTerrDec] = '' and [StateCode] = '' and [ZipCode] = '' and [EndDate] = '' and [EffectiveDate] = '')

修改

刚刚在while循环中添加了所有代码。

Answer 1

这对我有帮助

dataTable = dataTable.Rows.Cast<DataRow>().Where(row => !row.ItemArray.All(field => field is System.DBNull || string.Compare((field as string).Trim(), string.Empty) == 0)).CopyToDataTable();e

取自https://stackoverflow.com/a/9233678

OleDbDataReader从Excel电子表格中读取空白行

1 个答案: