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Rohan Kumar
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Issues while opening a UTF16 encoded .csv file in excel using c#

Hello Experts,

I am facing a problem in opening a .CSV file written using UTF-16 (Unicode) formatting in excel. My all tries to open it correctly either fails while opening of the file or the Unicode characters are not printed correctly in the opened excel file.
So is there any way where we can specify the encoding format of the file to be opened while opening using excel automation objects/functions.

I tried using Workbooks.open( filename) and Workbooks.OpenText( filepath, comma: true) functions.
Note: Both are working fine for a UTf-8 encoded .CSV file but fails for UTF-16(Unicode) case.

Please help me as i badly stuck here.

Thanks in advance
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Rohan Kumar

8/22/2022 - Mon
Phillip Burton

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Rohan Kumar

Hey..can u please explain how to implement your solution in c# and which approach you are using here.

I am little confused here as i didn't find any parameter (neither at opening .csv file or saving as an excel file) where i can specify this TextFilePlatform value to 28591.

Phillip Burton

You create a connection to Excel, add a new workbook, and then you insert the text into it - it's like importing a database connection.

The parameter TextFilePlatform is from the QueryTables interface.

Here is a list of its properties: http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.querytable_properties.aspx
Rohan Kumar

Thank u very much for the information. I tried implementing this approach and my code is executing without any errors but still m not able to see any data on saved .xls file.

My code looks like this:

   var m_objBooks = (Microsoft.Office.Interop.Excel.Workbooks)m_objExcel.Workbooks;
   var m_objBook = (Microsoft.Office.Interop.Excel._Workbook)(m_objBooks.Add(Type.Missing));
    // Create a QueryTable that starts at cell A1.
    var m_objSheets = (Microsoft.Office.Interop.Excel.Sheets)m_objBook.Worksheets;
    var  m_objSheet = (Microsoft.Office.Interop.Excel._Worksheet)(m_objSheets.get_Item(1));
    var m_objQryTables = m_objSheet.QueryTables;
    var range = m_objSheet.get_Range("$A$1");
    var m_objQryTable = (Microsoft.Office.Interop.Excel._QueryTable)m_objQryTables.Add(@"TEXT;c:\zakoha.csv", range);
       //  m_objQryTable.CommandType = 0; // throws error Invalid arguments
       m_objQryTable.FieldNames = true;
       m_objQryTable.RowNumbers = false;
       m_objQryTable.FillAdjacentFormulas = false;
       m_objQryTable.PreserveFormatting = true;
       m_objQryTable  .RefreshOnFileOpen = false;
       m_objQryTable.RefreshStyle = Microsoft.Office.Interop.Excel.XlCellInsertionMode.xlInsertDeleteCells;
       m_objQryTable.SavePassword = false;
       m_objQryTable.SaveData = true;
       m_objQryTable.AdjustColumnWidth = true;
       m_objQryTable.RefreshPeriod = 0;
       m_objQryTable.TextFilePromptOnRefresh = false;
       m_objQryTable.TextFilePlatform = 28591;
       m_objQryTable.TextFileStartRow = 1;
       m_objQryTable.TextFileParseType = Microsoft.Office.Interop.Excel.XlTextParsingType.xlDelimited;
       m_objQryTable.TextFileTextQualifier = Microsoft.Office.Interop.Excel.XlTextQualifier.xlTextQualifierDoubleQuote;
       m_objQryTable.TextFileConsecutiveDelimiter = true;
       m_objQryTable.TextFileTabDelimiter = true;
       m_objQryTable.TextFileSemicolonDelimiter = false;
       m_objQryTable.TextFileCommaDelimiter = true;
       m_objQryTable.TextFileSpaceDelimiter = false;
      m_objQryTable.TextFileOtherDelimiter = @"""";
      m_objQryTable.TextFileTrailingMinusNumbers =true;

      m_objQryTable  .TextFileColumnDataTypes = new Array [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]; // throws error Invalid       arguments
      m_objQryTable.Refresh(false); // excel cannot find the text file to refrest this data range

      // Save the workbook and quit Excel.          
      m_objSheet.get_Range("A1").Value2 = "Rohan";
      m_objBook.SaveAs (  @"C:\Users\jsingh\Desktop\TestN", Microsoft.Office.Interop.Excel.XlFileFormat.xlOpenXMLWorkbook, Type.Missing, Type.Missing,
                Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing,Type.Missing, Type.Missing);
            m_objBook.Close(false, Type.Missing, Type.Missing);

Only value that comes is Rohan that is wrote using .value2 property.

Can u please tell me what i am missing here.
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Phillip Burton

I note you say

// excel cannot find the text file to refrest this data range

Is the csv in the root of the C drive, as in:


If not, the above line will need updating.
Rohan Kumar

Aha got it...users folder was different so file was not located at runtime..

Thanks a lot.
Rohan Kumar

Got quick and clear response. Gr8 job.
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