Using OpenXmlReader

c#, openxml, openxml-sdk

Solution

I think you took the wrong `WorksheetPart` for reading the rows.

The line

workbookPart.WorksheetParts.First();

gets the first `WorksheetPart` of the collection which must not necessarily be the first worksheet as you see it in Microsoft Excel.

So, iterate through all `WorksheetParts` and you should see some output on your console window.

static void ReadExcelFileSAX(string fileName)
{
  using (SpreadsheetDocument spreadsheetDocument = 
                                   SpreadsheetDocument.Open(fileName, true))
  {
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;

    // Iterate through all WorksheetParts
    foreach (WorksheetPart worksheetPart in workbookPart.WorksheetParts)
    {          
      OpenXmlPartReader reader = new OpenXmlPartReader(worksheetPart);
      string text;
      string rowNum;
      while (reader.Read())
      {
        if (reader.ElementType == typeof(Row))
        {
          do
          {
            if (reader.HasAttributes)
            {
              rowNum = reader.Attributes.First(a => a.LocalName == "r").Value;
              Console.Write("rowNum: " + rowNum);
            }

          } while (reader.ReadNextSibling()); // Skip to the next row

          break; // We just looped through all the rows so no 
                 // need to continue reading the worksheet
        }

        if (reader.ElementType != typeof(Worksheet))
          reader.Skip(); 
      }
      reader.Close();      
    }
  }  
}

To read all cell values use the following function (all error handling details omitted) :

static void ReadAllCellValues(string fileName)
{
  using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(fileName, false))
  {
    WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;

    foreach(WorksheetPart worksheetPart in workbookPart.WorksheetParts)
    {
      OpenXmlReader reader = OpenXmlReader.Create(worksheetPart);

      while (reader.Read())
      {
        if (reader.ElementType == typeof(Row))
        {
          reader.ReadFirstChild();

          do
          {
            if (reader.ElementType == typeof(Cell))
            {
              Cell c = (Cell)reader.LoadCurrentElement();

              string cellValue;

              if (c.DataType != null && c.DataType == CellValues.SharedString)
              {
                SharedStringItem ssi = workbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>().ElementAt(int.Parse(c.CellValue.InnerText));

                cellValue = ssi.Text.Text;
              }
              else
              {
                cellValue = c.CellValue.InnerText;
              }

              Console.Out.Write("{0}: {1} ", c.CellReference, cellValue);
            }
          } while (reader.ReadNextSibling());
          Console.Out.WriteLine();
        }            
      }
    }   
  }
}

In the code above you see that cells with data type `SharedString` must be handled using the `SharedStringTablePart`.

Problem

I hate to resort to StackOverflow for something so (seemingly) basic, but I've been fighting with Microsoft for the last few hours and seem to be hitting a dead end. I am trying to read (large) Excel 2007+ spreadsheets, and Google has kindly informed me that using the OpenXml SDK is a pretty popular choice. So I gave the thing a shot, read some tutorials, checked Microsoft's own library pages, and got very little out of them all. I am using a small test spreadsheet with just one column of numbers and one of strings - large scale testing will come later. I've tried several implementations similar to the one I am about to post, and none of them read data. The code below was mostly taken from another StackOverflow thread, where it seemed to have worked - not so for me. I figured I'll have you guys check/debug/help with this version, because it'll likely be less broken than anything I have written today. ``` static void ReadExcelFileSAX(string fileName) { using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(fileName, true)) { WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart; WorksheetPart worksheetPart = workbookPart.WorksheetParts.First(); OpenXmlPartReader reader = new OpenXmlPartReader(worksheetPart); string text; string rowNum; while (reader.Read()) { if (reader.ElementType == typeof(Row)) { do { if (reader.HasAttributes) { rowNum = reader.Attributes.First(a => a.LocalName == "r").Value; Console.Write("rowNum: " + rowNum); //we never even get here, I tested it with a breakpoint } } while (reader.ReadNextSibling()); // Skip to the next row Console.ReadKey(); break; // We just looped through all the rows so no need to continue reading the worksheet } if (reader.ElementType == typeof(Cell)) { } if (reader.ElementType != typeof(Worksheet)) // Dont' want to skip the contents of the worksheet reader.Skip(); // Skip contents of any node before finding the first row. } reader.Close(); Console.WriteLine(); Console.ReadKey(); } } ``` And, on a side note, are there any good alternatives to using the OpenXml SDK I have somehow missed?

Original source