如何适合Excel工作表中的列

Question

I'm writing a list to an excel sheet generated using EPPlus with .xlsx extension. Then using worksheet.Cells[worksheet.Dimension.Address].AutoFitColumns(); method I tried to fit the columns.

This is how I write data

using (ExcelPackage xlPackage = new ExcelPackage(newFile))
      {
        System.Data.DataTable dt = new System.Data.DataTable();
        var ws = xlPackage.Workbook.Worksheets.FirstOrDefault(x => x.Name == language.Culture);
        if (ws == null)
         {
          int i = 1, j = 0;
           worksheet = xlPackage.Workbook.Worksheets.Add(language.Culture);
           foreach (ExcelFields fieldValues in UnmatchedFieldList)
           {
                 //code
            }
           else
             {
                int i = 0;
                worksheet = xlPackage.Workbook.Worksheets[language.Culture];
                colCount = worksheet.Dimension.End.Column;
                 rowCount = worksheet.Dimension.End.Row;
                 foreach (ExcelFields fieldValues in UnmatchedFieldList)
                 {
                       worksheet.Cells[rowCount + 1, count + 1].Value = itemName;
                  }
                 worksheet.Cells[worksheet.Dimension.Address].AutoFitColumns();
                 xlPackage.Save();
             }

I read data as

            string sheetName = language.Culture;
            var excelFile = new ExcelQueryFactory(excelPath);
            IQueryable<Row> excelSheetValues = from workingSheet in excelFile.Worksheet(sheetName) select workingSheet;
            string[] headerRow = excelFile.GetColumnNames(sheetName).ToArray();

At headerRow it is throwing the below error

When I'm trying to read the data from excel it is throwing an exception

External table is not in the expected format

I found out,this is due to the columns are not formatted(width) correctly. When I manually set the columns width by double clicking the cell and run the code it is working fine

So I want to achieve this using code

Answer 1

External table is not in the expected format exception is occurred because of exception of connection string so there fore check your connection string with following sample

public static string docPath= @"C:\sourcefolder\myfile.xlsx";
public static string ConnectionString= "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + docPath + ";Extended Properties=Excel 12.0;";

or if you use LinqToExcel then check whether you have set setting the DatabaseEngine property like as follows

public string docPath= @"C:\sourcefolder\myfile.xlsx";
var excelFile = new ExcelQueryFactory(docPath);
excelFile.DatabaseEngine = DatabaseEngine.Ace;