正在下载excel文件

我的问题是我在数据库中有很多信息，理想情况下我想将其从我的客户端下载到excel文件中。正在下载excel文件

我使用的NPOI库很棒，已经在系统中的控制台应用程序中实现，但是这不是我写的。

目前会发生什么事，当我在ActionLink的点击我的控制器，在空白的页面显示说什么，但“System.IO.MemoryStream” ..

显然，这不是想要的效果。我想要的方式是当用户点击链接时，报告会下载。

下面是报告类：

public class RepairReporting 
    { 
     public Stream GenerateRepairFile(List<Int64> itemIds) 
     { 
      // Getting the complete workbook... 
      // 
      MemoryStream ms = new MemoryStream(); 
      HSSFWorkbook templateWorkbook = new HSSFWorkbook(); 

      // Create a worksheet by it's name. 
      // 
      HSSFSheet sheet = templateWorkbook.CreateSheet("Repairs Report"); 
      sheet.ForceFormulaRecalculation = true; 



      HSSFRow dataRow = sheet.CreateRow(0); 

      HSSFCell cell = dataRow.CreateCell(0); 
      cell.SetCellValue("Repairs"); 


      cell = dataRow.CreateCell(1); 
      cell.SetCellValue(DateTime.Now); 

      // Build the header row 
      // 
      dataRow = sheet.CreateRow(1); 

      string[] colHeaders = new string[]{ "Product Code", 
               "Product Name", 
               "Customer", 
               "Date Submitted For Repair", 
               "Date Sent For Repair", 
               "Expected Release Date",  
               "Estimated Cost", 
               "Actual Cost", 
               "Total Repair Price (END PRICE)" 
               }; 

      int colPosition = 0; 

      // Write all the headers out. 
      // 
      foreach (string colHeader in colHeaders) 
      { 
       cell = dataRow.CreateCell(colPosition++); 
       cell.SetCellValue(colHeader); 
      } 

      // Build the item rows. 
      // 
      int row = 2; 

      foreach (Int64 itemId in itemIds) 
      { 
       using (ModelContainer ctn = new ModelContainer()) 
       { 

        Item currentItem = (from t in ctn.Items 
              where t.ItemID == itemId && t.RepairSelection == true 
              select t).First(); 


        dataRow = sheet.CreateRow(row++); 
        colPosition = 0; 

        cell = dataRow.CreateCell(colPosition++); 
        cell.SetCellValue(currentItem.ProductCode); 

        cell = dataRow.CreateCell(colPosition++); 
        cell.SetCellValue(currentItem.Product); 

        cell = dataRow.CreateCell(colPosition++); 
        cell.SetCellValue(currentItem.Customer.Name); 


        cell.SetCellValue(currentItem.Repair.SubmissionDate.Value.ToString("MM/dd/yyyy")); 


        if (currentItem.Repair.SentForConversion != null) 
        { 
         cell = dataRow.CreateCell(colPosition++); 
         cell.SetCellValue(currentItem.Repair.SentForRepair.Value.ToString("MM/dd/yyyy")); 
        } 
        else 
        { 
         colPosition++; 
         colPosition++; 
        } 

        if (currentItem.Repair.ReleaseDate != null) 
        { 
         cell = dataRow.CreateCell(colPosition++); 
         cell.SetCellValue(currentItem.Repair.ReleaseDate.Value.ToString("MM/dd/yyyy")); 
        } 
        else 
        { 
         colPosition++; 
         colPosition++; 
        } 


        if (currentItem.Repair.CostEstimation != null) 
        { 
         cell = dataRow.CreateCell(colPosition++); 
         cell.SetCellValue(currentItem.Repair.CostEstimation.Value.ToString()); 
        } 
        else 
        { 
         colPosition++; 
         colPosition++; 
        } 

        if (currentItem.Repair.ActualCost != null) 
        { 
         cell = dataRow.CreateCell(colPosition++); 
         cell.SetCellValue(currentItem.Repair.ActualCost.Value.ToString()); 
        } 
        else 
        { 
         colPosition++; 
         colPosition++; 
        } 

        if (currentTitle.Repair.TotalRepairPrice != null) 
        { 
         cell = dataRow.CreateCell(colPosition++); 
         cell.SetCellValue(currentItem.Repair.TotalRepairPrice.Value.ToString()); 
        } 
        else 
        { 
         colPosition++; 
         colPosition++; 
        } 

       } 

      } 


      templateWorkbook.Write(ms); 
      ms.Position = 0; 

      return ms; 
     } 
    } 
}

然后这里是我的控制，我认为这是我的问题在于：

public Stream repairReport() 
    { 
     ModelContainer ctn = new ModelContainer(); 

     List<Title> items = null; 

     var itemObjects = ctn.Items.Where(t => t.RepairSelection == true) 
      .Select(t =>t); 

     items = itemObjects.ToList(); 

     RepairReporting rtp = new RepairReporting(); 


     List<long> itemIDs = items.Select(t => t.ItemID).ToList(); 

     Stream repairReport = rtp.GenerateRepairFile(itemIDs); 

     return repairReport; 
    }

来源

2011-02-02 109221793

如果这是在你的控制你的行动方法，你可以通过返回FileStreamResult，这需要stream在其构造与ContentType

public FileResult RepairReport() 
{ 
    ModelContainer ctn = new ModelContainer(); 

    List<Title> items = ctn.Items.Where(t => t.RepairSelection == true) 
     .Select(t =>t).ToList(); 

    RepairReporting rtp = new RepairReporting(); 

    List<long> itemIDs = items.Select(t => t.ItemID).ToList(); 

    Stream repairReport = rtp.GenerateRepairFile(itemIDs); 

    return new FileStreamResult(repairReport, "application/ms-excel") 
     { 
      FileDownloadName = "RepairReport.xls", 
     }; 
}

来源

2011-02-02 16:06:54 hunter

一起返回一个FileResult！谢谢，这工作得很好！还有一件事。当我下载这个文件时，它会以未知文件类型下载，而不是Excel文件。如果我点击“打开”，然后选择excel它打开罚款。无论如何，我可以把它作为一个直接的excel文件下载吗？ – 109221793 2011-02-02 16:12:46

2担忧

太多的行可能会导致内存问题。
当你声明新的变量，如dataRow.CreateCell。因为你调用COM互操作，试图处理你使用的每个对象。 obj.Dispose（）;和Marshal.Release（obj）;我不认为NPOI能够做到这一点。

来源

2011-02-02 16:04:41 Bonshington

正在下载excel文件

回答

相关问题