Tarik Tarik - 2 months ago 15
C# Question

How to import all the Excel sheets to DataSet in C#

I've searched internet for this and couldn't really find a question like it. Everyone was looking for a way to import an individual sheet in the excel file but what I want is to import all the sheets in the file to

DataTable
's in
DataSet
without knowing the sheet names.

I've not done much things with Excel before. This a sample and partially working code I've found on the internet and it only parses the given sheet name:

public static DataSet Parse(string fileName, string workSheetName)
{
string connectionString = string.Format("provider=Microsoft.Jet.OLEDB.4.0; data source={0};Extended Properties=Excel 8.0;", fileName);
string query = string.Format("SELECT * FROM [{0}$]", workSheetName);

DataSet data = new DataSet();
using (OleDbConnection con = new OleDbConnection(connectionString))
{
con.Open();
OleDbDataAdapter adapter = new OleDbDataAdapter(query, con);
adapter.Fill(data);
}

return data;
}


In the code above, as you see, workSheetName should be passed in so the query can know where to look at to import. In my case, I want it to traverse all the sheets no matter what they are named like and import them to individual
DataTable
's of a
DataSet
.

So in essence, the final thing will be a
DataSet
in which each
DataTable
holds rows for each sheet in the imported file.

Answer

This is a code I came up with and it works perfect but I saw someone else already added an answer:

static DataSet Parse(string fileName)
{
    string connectionString = string.Format("provider=Microsoft.Jet.OLEDB.4.0; data source={0};Extended Properties=Excel 8.0;", fileName);


    DataSet data = new DataSet();

    foreach(var sheetName in GetExcelSheetNames(connectionString))
    {
        using (OleDbConnection con = new OleDbConnection(connectionString))
        {    
            var dataTable = new DataTable();
            string query = string.Format("SELECT * FROM [{0}]", sheetName);
            con.Open();
            OleDbDataAdapter adapter = new OleDbDataAdapter(query, con);
            adapter.Fill(dataTable);
            data.Tables.Add(dataTable);
        }
    }

    return data;
}

static string[] GetExcelSheetNames(string connectionString)
{
        OleDbConnection con = null;
        DataTable dt = null;
        con= new OleDbConnection(connectionString);
        con.Open();
        dt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

        if (dt == null)
        {
            return null;
        }

        String[] excelSheetNames = new String[dt.Rows.Count];
        int i = 0;

        foreach (DataRow row in dt.Rows)
        {
            excelSheetNames[i] = row["TABLE_NAME"].ToString();
            i++;
        }

        return excelSheetNames;
}