'string' 不包含 'Connection' 的定义

Question

我正在尝试使用 MVC5 中的 Epplus 库和 C# 中的 Entity framework 6 将 excel 文件导入到我的 sql 数据库中。我收到此错误。我知道我获取连接字符串的方式不对。

我在 'Connection'

的 await new bulkwriter 行收到错误

 public async Task<ActionResult> StructureAsync(FormCollection postedFile)
    {
        var usersList = new List<bomStructuredImportTgt>();
        if (Request != null)
        {
            HttpPostedFileBase file = Request.Files["postedFile"];
            if ((file != null) && (file.ContentLength > 0) && !string.IsNullOrEmpty(file.FileName))
            {
                string fileName = file.FileName;
                string fileContentType = file.ContentType;
                byte[] fileBytes = new byte[file.ContentLength];
                var data = file.InputStream.Read(fileBytes, 0, Convert.ToInt32(file.ContentLength));
                using (var package = new ExcelPackage(file.InputStream))
                {
                    var currentSheet = package.Workbook.Worksheets;
                    var workSheet = currentSheet.First();
                    var noOfCol = workSheet.Dimension.End.Column;
                    var noOfRow = workSheet.Dimension.End.Row;
                    for (int rowIterator = 2; rowIterator <= noOfRow; rowIterator++)
                    {
                        var user = new bomStructuredImportTgt();
                        user.ACTUAL_DATE = Convert.ToDateTime(workSheet.Cells[rowIterator, 1].Value);
                        user.DESCRIPTION = workSheet.Cells[rowIterator, 2].Value?.ToString();
                        user.LEVEL = Convert.ToInt32(workSheet.Cells[rowIterator, 3].Value);
                        user.PARENT_PARTNO = workSheet.Cells[rowIterator, 4].Value?.ToString();
                        user.PART_NO = workSheet.Cells[rowIterator, 5].Value?.ToString();
                        user.PART_NAME = workSheet.Cells[rowIterator, 6].Value?.ToString();
                        user.HNS = workSheet.Cells[rowIterator, 7].Value?.ToString();
                        user.DWGSZ = workSheet.Cells[rowIterator, 8].Value?.ToString();
                        user.PART = workSheet.Cells[rowIterator, 9].Value?.ToString();
                        user.L1QTY = Convert.ToInt32(workSheet.Cells[rowIterator, 10].Value);
                        user.COLORM = workSheet.Cells[rowIterator, 11].Value?.ToString();
                        user.ATTCD = workSheet.Cells[rowIterator, 12].Value?.ToString();
                        user.KD = workSheet.Cells[rowIterator, 13].Value?.ToString();
                        user.SELL = workSheet.Cells[rowIterator, 14].Value?.ToString();
                        user.PL_GROUP = workSheet.Cells[rowIterator, 15].Value?.ToString();
                        user.PL1 = workSheet.Cells[rowIterator, 16].Value?.ToString();
                        user.AT1 = workSheet.Cells[rowIterator, 17].Value?.ToString();
                        user.PL2 = workSheet.Cells[rowIterator, 18].Value?.ToString();
                        user.AT2 = workSheet.Cells[rowIterator, 19].Value?.ToString();
                        user.PL3 = workSheet.Cells[rowIterator, 20].Value?.ToString();
                        user.PLANT = workSheet.Cells[rowIterator, 21].Value?.ToString();
                        user.SHRPCMINMAX = workSheet.Cells[rowIterator, 22].Value?.ToString();
                        usersList.Add(user);
                    }
                }
            }
        }

        using (SqlConnection excelImportDBEntities = new SqlConnection("Dev_Purchasing_New_ModelEntities"))
        {

            await new BulkWriter().InsertAsync(usersList, "bomStructuredImportTgt", excelImportDBEntities.Database.Connection, CancellationToken.None);
        }
        return View("Structure");
    }

  public class BulkWriter
    {
        private static readonly ConcurrentDictionary<Type, SqlBulkCopyColumnMapping[]> ColumnMapping =
            new ConcurrentDictionary<Type, SqlBulkCopyColumnMapping[]>();

        public async Task InsertAsync<T>(IEnumerable<T> items, string bomStructuredImportTgt, SqlConnection excelImportDBEntities,
            CancellationToken cancellationToken)
        {
            using (var bulk = new SqlBulkCopy(excelImportDBEntities))
            using (var reader = ObjectReader.Create(items))
            {
                bulk.DestinationTableName = bomStructuredImportTgt;
                foreach (var colMap in GetColumnMappings<T>())
                    bulk.ColumnMappings.Add(colMap);
                await bulk.WriteToServerAsync(reader, cancellationToken);
            }
        }

        private static IEnumerable<SqlBulkCopyColumnMapping> GetColumnMappings<T>() =>
            ColumnMapping.GetOrAdd(typeof(T),
                type =>
                    type.GetProperties()
                        .Select(p => new SqlBulkCopyColumnMapping(p.Name, p.Name)).ToArray());
    }

我有一个 class BulkWriter，用于批量复制 sql 中的记录。我想使用这个 class 让我的代码更省时。

Answer 1

试试这个：

string connectionString = ConfigurationManager.ConnectionStrings["Dev_Purchasing_New_ModelEntities"].ConnectionString;
using (SqlConnection excelImportDBEntities = new SqlConnection(connectionString)){
   ...
}

Answer 2

由于您的 excelImportDBEntities 变量是 SqlConnection 类型，它有 Database 属性。属性 returns a string - 此连接连接到的数据库的名称。当然，您不能从数据库名称中获取 .Connection 并且在尝试时会出现编译错误。

然后，如何修复它。您的 BulkWriter 的 InsertAsync 方法需要 SqlConnection 对象，而您已经有了这个对象 excelImportDBEntities。为什么不直接使用呢？替换

await new BulkWriter().InsertAsync(usersList, "bomStructuredImportTgt", excelImportDBEntities.Database.Connection, CancellationToken.None);

和

await new BulkWriter().InsertAsync(usersList, "bomStructuredImportTgt", excelImportDBEntities, CancellationToken.None);

这个错误应该消失了。

另一个问题是，正如其他答案和评论中提到的，您似乎对连接字符串处理不当，这将在您编译和运行您的代码后产生错误。

'string' 不包含 'Connection' 的定义

'string' does not contain a definition for 'Connection'

c#

asp.net-mvc-5

entity-framework-6

epplus

sqlconnection