Read Excel Files Using Open XML SDK In ASP.NET C#

Background

A few days back, I got a requirement to read MS Excel files and store those values in the SQL Server database. Hence, in this example, I am going to show how to get the basic four types of important data such as Excel Work Book Name, Worksheet Count in that Workbook, Name of the Worksheets, and finally the Value of the First Cell in that Worksheet.

Prerequisites

First step is to download the Openxml dll from the official site.

Second step is to kindly ensure to add the above dll, as shown in the screenshot, given below:





Important note

Once you load this dll and write the code, you will get the following error:



Resolution for above problem is,



Add the above dll also to the project.

Namespace

using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;

C# Code

protected void insertBoqElements_Click(object sender, EventArgs e)
{
    try
    {
        //specify the file name where its actually exist
        string filepath = @ "D:\TPMS\Uploaded_Boq\test.xlsx";

        //open the excel using openxml sdk
        using(SpreadsheetDocument doc = SpreadsheetDocument.Open(filepath, false))
        {

            //create the object for workbook part
            WorkbookPart wbPart = doc.WorkbookPart;

            //statement to get the count of the worksheet
            int worksheetcount = doc.WorkbookPart.Workbook.Sheets.Count();

            //statement to get the sheet object
            Sheet mysheet = (Sheet) doc.WorkbookPart.Workbook.Sheets.ChildElements.GetItem(0);

            //statement to get the worksheet object by using the sheet id
            Worksheet Worksheet = ((WorksheetPart) wbPart.GetPartById(mysheet.Id)).Worksheet;

            //Note: worksheet has 8 children and the first child[1] = sheetviewdimension,....child[4]=sheetdata
            int wkschildno = 4;


            //statement to get the sheetdata which contains the rows and cell in table
            SheetData Rows = (SheetData) Worksheet.ChildElements.GetItem(wkschildno);


            //getting the row as per the specified index of getitem method
            Row currentrow = (Row) Rows.ChildElements.GetItem(1);

            //getting the cell as per the specified index of getitem method
            Cell currentcell = (Cell) currentrow.ChildElements.GetItem(1);

            //statement to take the integer value
            string currentcellvalue = currentcell.InnerText;

        }
    } catch (Exception Ex)
    {

        lbldisplayerrors.Text = Ex.Message;
    }

}

Note

If the cell contains a string, then this value is an index into the shared string table, pointing to the actual string value. Otherwise, the value of the cell is expressed directly in this element

Source: CellValue Class

For taking the string Value from Cell

protected void insertBoqElements_Click(object sender, EventArgs e)
{
    try
    {
        //specify the file name where its actually exist
        string filepath = @ "D:\TPMS\Uploaded_Boq\test.xlsx";

        //open the excel using openxml sdk
        using(SpreadsheetDocument doc = SpreadsheetDocument.Open(filepath, false))
        {

            //create the object for workbook part
            WorkbookPart wbPart = doc.WorkbookPart;

            //statement to get the count of the worksheet
            int worksheetcount = doc.WorkbookPart.Workbook.Sheets.Count();

            //statement to get the sheet object
            Sheet mysheet = (Sheet) doc.WorkbookPart.Workbook.Sheets.ChildElements.GetItem(0);

            //statement to get the worksheet object by using the sheet id
            Worksheet Worksheet = ((WorksheetPart) wbPart.GetPartById(mysheet.Id)).Worksheet;

            //Note: worksheet has 8 children and the first child[1] = sheetviewdimension,....child[4]=sheetdata
            int wkschildno = 4;


            //statement to get the sheetdata which contains the rows and cell in table
            SheetData Rows = (SheetData) Worksheet.ChildElements.GetItem(wkschildno);


            //getting the row as per the specified index of getitem method
            Row currentrow = (Row) Rows.ChildElements.GetItem(0);

            //getting the cell as per the specified index of getitem method
            Cell currentcell = (Cell) currentrow.ChildElements.GetItem(0);

            string currentcellvalue = string.Empty;


            if (currentcell.DataType != null)
            {
                if (currentcell.DataType == CellValues.SharedString)
                {
                    int id = -1;

                    if (Int32.TryParse(currentcell.InnerText, out id))
                    {
                        SharedStringItem item = GetSharedStringItemById(wbPart, id);

                        if (item.Text != null)
                        {
                            //code to take the string value
                            currentcellvalue = item.Text.Text;
                        } else if (item.InnerText != null)
                        {
                            currentcellvalue = item.InnerText;
                        } else if (item.InnerXml != null)
                        {
                            currentcellvalue = item.InnerXml;
                        }
                    }
                }
            }

        }
    } catch (Exception Ex)
    {

        lbldisplayerrors.Text = Ex.Message;
    }

}

public static SharedStringItem GetSharedStringItemById(WorkbookPart workbookPart, int id)
{
    return workbookPart.SharedStringTablePart.SharedStringTable.Elements < SharedStringItem > ().ElementAt(id);
}

Other References

Link to: Read excel files using Microsoft Office Interop Assemblies in asp.net

I hope the above information was useful. Kindly let me know your thoughts.