Importieren von Excel-Datei in SQL mit C# Entity FrameWork

Question

Ich muss Excel-Datei mit 3000 Zeilen in MS SQL Server-Datenbank importieren, ich benutze C# mit Entity-Framework, die Sache dauert Operation dauert etwa 15-20 Minuten. Mache ich etwas falsch oder ist das normal?

ist hier foreach-Schleife von meinem Code, wo Pfade Pfaddatei zu übertreffen ist:

  foreach (var item in paths) 
      { 
       Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); 
       Microsoft.Office.Interop.Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(item.Value); 
       Microsoft.Office.Interop.Excel._Worksheet xlWorksheet = xlWorkbook.Sheets[1]; 
       Microsoft.Office.Interop.Excel.Range xlRange = xlWorksheet.UsedRange; 
       try 
       { 

        int rowCount = xlRange.Rows.Count; 
        int colCount = xlRange.Columns.Count; 

        string GenDateString = xlRange.Cells[3, 6].Value2.ToString(); 
        string GenDate = GenDateString.Substring(0, 10); 
        string Client = xlRange.Cells[3, 1].Value2.ToString(); 
        string User = xlRange.Cells[3, 2].Value2.ToString(); 
        string error; 
        if (IsCorrectDate(item.Key, xlRange)) 
        { 
         CultureInfo provider = CultureInfo.InvariantCulture; 
         Import import = new Import() 
         { 
          Month = month, 
          year = year, 
          EndDate = item.Key[1], 
          GenerateDate = DateTime.ParseExact(GenDate, "dd.MM.yyyy", provider), 
          StartDate = item.Key[0], 
          FileName = item.Value.ToString() 
         }; 
         if (db.Imports.Any(i => i.StartDate == import.StartDate || i.EndDate == import.EndDate)) 
         { 
          try 
          { 
           progressbar.ReleaseBar(); 
          } 
          catch (Exception) 
          { 
          } 
          SAPbouiCOM.Framework.Application.SBO_Application.SetStatusBarMessage("ასეთი ფაილი უკვე შეიმპორტებულია", SAPbouiCOM.BoMessageTime.bmt_Short, true); 
          //cleanup 
          GC.Collect(); 
          GC.WaitForPendingFinalizers(); 

          //rule of thumb for releasing com objects: 
          // never use two dots, all COM objects must be referenced and released individually 
          // ex: [somthing].[something].[something] is bad 

          //release com objects to fully kill excel process from running in the background 
          Marshal.ReleaseComObject(xlRange); 
          Marshal.ReleaseComObject(xlWorksheet); 

          //close and release 
          xlWorkbook.Close(); 
          Marshal.ReleaseComObject(xlWorkbook); 

          //quit and release 
          xlApp.Quit(); 
          Marshal.ReleaseComObject(xlApp); 
          return; 
         } 
         for (int i = 8; i <= rowCount; i++) 
         { 
          Debug.WriteLine(i); 
          var bpCode = xlRange.Cells[i, 1].Value2.ToString(); 
          if (bpCode == "რეპორტის დასასრული") 
           break; 
          i++; 
          Mediator mediator = new Mediator() 
          { 
           BPCode = bpCode, 
           Import = import, 
          }; 

          for (int j = 0; j < clicks.Count(); j++) 
          { 
           progressbar.Up(); 
           rowsc--; 
           var clickName = xlRange.Cells[i + j, 1].Value2.ToString(); 
           Statistic SmeStatistic = new Statistic() 
           { 
            ClickNameID = clicks.FirstOrDefault(c => c.Name == clickName).ID, 
            ReqPerson = int.Parse(xlRange.Cells[i + j, 2].Value2.ToString()), 
            ReqBussiness = int.Parse(xlRange.Cells[i + j, 3].Value2.ToString()), 
            ResPerson = int.Parse(xlRange.Cells[i + j, 5].Value2.ToString()), 
            ResBussiness = int.Parse(xlRange.Cells[i + j, 6].Value2.ToString()), 
            Mediator = mediator, 
           }; 
           //var xxx = clicks.FirstOrDefault(c => c.Name == clickName).ID; 
           db.Statistics.Add(SmeStatistic); 

          } 
          i += clicks.Count() - 1; 
         } 
        } 
        else 
        { 
         //int iReturnValue = SAPbouiCOM.Framework.Application.SBO_Application.MessageBox(item.Value + " ფაილის თარიღი არასწორია.", 1, "&Ok"); 
         try 
         { 
          progressbar.ReleaseBar(); 
         } 
         catch (Exception) 
         { 
         } 
         SAPbouiCOM.Framework.Application.SBO_Application.SetStatusBarMessage("ფაილის თარიღები არ ემთხვევა არჩეულ პერიოდს", SAPbouiCOM.BoMessageTime.bmt_Short, true); 
         //cleanup 
         GC.Collect(); 
         GC.WaitForPendingFinalizers(); 

         //rule of thumb for releasing com objects: 
         // never use two dots, all COM objects must be referenced and released individually 
         // ex: [somthing].[something].[something] is bad 

         //release com objects to fully kill excel process from running in the background 
         Marshal.ReleaseComObject(xlRange); 
         Marshal.ReleaseComObject(xlWorksheet); 

         //close and release 
         xlWorkbook.Close(); 
         Marshal.ReleaseComObject(xlWorkbook); 

         //quit and release 
         xlApp.Quit(); 
         Marshal.ReleaseComObject(xlApp); 
         return; 
        } 
       } 
       catch (Exception ex) 
       { 
        SAPbouiCOM.Framework.Application.SBO_Application.MessageBox(ex.Message); 
       } 
       finally 
       { 
        //cleanup 
        GC.Collect(); 
        GC.WaitForPendingFinalizers(); 

        //rule of thumb for releasing com objects: 
        // never use two dots, all COM objects must be referenced and released individually 
        // ex: [somthing].[something].[something] is bad 

        //release com objects to fully kill excel process from running in the background 
        Marshal.ReleaseComObject(xlRange); 
        Marshal.ReleaseComObject(xlWorksheet); 

        //close and release // 

        //xlWorkbook.Close(); 
        Marshal.ReleaseComObject(xlWorkbook); 


        //quit and release 
        //xlApp.Quit(); 
        //Marshal.ReleaseComObject(xlApp); 
       } 

      } 

Answer 1

Sie ein neuer Excel-Anwendungsobjekt (xlApp) jedes Mal, wenn die Schleife Kreise zu schaffen - dies langsam. Versuchen Sie, es vor der Schleife zu erstellen, damit Sie es wiederverwenden können.

Es kann andere Dinge geben, die Sie tun können, um es zu beschleunigen, aber ich bin geneigt, dem Kommentar von Panagiotis zuzustimmen - benutzen Sie Interop hier nicht. Ich bin auch in dieses Kaninchenloch gegangen und es ist sehr viel komplizierter und langsamer als mit JET OLEDB.

Dies ist eine grobe Anleitung, wie Sie Jet stattdessen verwenden könnte - ich füllen nur eine Datentabelle irgendwo in der Schleife zu verwenden:

using System.Data.OleDb; 

foreach (var item in paths) 
{ 
    string excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + item + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\""; 

    using (OleDbConnection excelConnection = new OleDbConnection(excelConnectionString)) 
    { 
     excelConnection.Open(); 

     DataTable dt = new DataTable(); //excelConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new Object[] { null, null, null, "TABLE" }); 
     string query = sheetname.Contains(" ") ? string.Format("Select * from ['{0}$']", sheetname) : string.Format("Select * from [{0}$]", sheetname); 
     using (OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, excelConnection)) 
     { 
      dataAdapter.Fill(dt); 
     } 

     //do something with the data here 

     excelConnection.Close(); 
    } 
}