按单元格读取c＃.net中的excel文件

Question

I'm new to c#.net

I have excel sheet and I want to import into database .

I want to read it cell by cell and want to insert value in database .

this.openFileDialog1.FileName = "*.xls";
            DialogResult dr = this.openFileDialog1.ShowDialog();
            if (dr == System.Windows.Forms.DialogResult.OK)
            {
                string path = openFileDialog1.FileName;
                string connectionString = String.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=""Excel 8.0;HDR=no;IMEX=1;""", openFileDialog1.FileName);
                string query = String.Format("select * from [{0}$]", "Sheet3");

                OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, connectionString);

                DataSet dataSet = new DataSet();
                dataAdapter.Fill(dataSet);
                dataGridView1.DataSource = dataSet.Tables[0];

Answer 1

Check out NPOI

http://npoi.codeplex.com/

It's the .NET version of Apache's POI Excel implementation. It'll easily do what you need it to do, and will help avoid some of the problems ( ie local copy of Excel, or worse, copy of Excel on the server ) that you'll face when using the Jet provider.

Answer 2

I assume that after you execute the code in your question, you can see the values within dataGridView1 .

The actual reading from the excel sheet is done when calling dataAdapter.Fill . So, in your case, reading the cells comes down to indexing columns and rows in dataSet.Tables[0] .

For example:

for (int row = 0; row < dataSet.Tables[0].Rows.Count; row++)
{
   DataRow r = dataSet.Tables[0].Rows[row];
}

Accessing the cells in row r is trivial (like the sample above, just for cell).

EDIT
I forgot to describe the "insert the values into a database" part. I presume that the database is SQL Server (may be Express edition, too).

First: create a database connection. Instead of manually composing the connection string, use the SqlConnectionStringBuilder :

SqlConnectionStringBuilder csb = new SqlConnectionStringBuilder();
csb.DataSource = <your server instance, e.g. "localhost\sqlexpress">;
csb.InitialCatalog = <name of your database>;
csb.IntegratedSecurity = <true if you use integrated security, false otherwise>;
if (!csb.IntegratedSecurity)
{
    csb.UserId = <User name>;
    csb.Password = <Password>;
}

Then, create and open a new SqlConnection with the connection string:

using (SqlConnection conn = new SqlConnection(csb.ConnectionString))
{
    conn.Open();

Iterate over all the values you want to insert and execute a respective insert command:

    for (...)
    {
        SqlCommand cmd = new SqlCommand("INSERT INTO ... VALUES (@param1, ..., @paramn)", conn);
        cmd.Parameters.AddWithValue("@param1", value1);
        ...
        cmd.Parameters.AddWithValue("@paramn", valuen);

        cmd.ExecuteNonQuery();
    }

This closes the connection, as the using block ends:

}

And there you go. Alternatively, you could use a data adapter with a special insert-command. Then, inserting the values would come down to a one-liner, however, your database table must have the same structure as the Excel-sheet (respectively: as the data table you obtained in the code you posted.