使用c＃计算excel中的行数

Question

i have the excel sheet with code like

VPUDB001
VPUDB002
VPUDB003
VPUDB004
VPUDB005
VPUDB006
VPUDB007
VPUDB008
VPUDB009
VPUDB010
VPUDB011

VPULN001
VPULN002
VPULN003
VPULN004
VPULN005
VPULN006
VPULN007
VPULN008
VPULN009

I want to display the number of rows starting with VPUDB and VPULN in excel.

private void browse_Click(object sender, EventArgs e)
{
    DialogResult fileopen = openFileDialog1.ShowDialog();
    string filename = openFileDialog1.FileName;
    textBox1.Text = filename;
    try
    {
        olecon = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + filename + "';Extended Properties=Excel 12.0");
        olecon.Open();
        DataTable dt = new DataTable();
        dt = olecon.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
        string[] excelsheetnames = new string[dt.Rows.Count];
        int i = 0;
        foreach (DataRow row in dt.Rows)
        {
            excelsheetnames[i] = row["TABLE_NAME"].ToString();
            string sheetnamealone = excelsheetnames[i].Remove(excelsheetnames[i].IndexOf('$'));
            comboBox1.Items.Add(sheetnamealone);
            i++;
        }
        //comboBox1.SelectedIndex = 1;

    }
    catch
    {

    }
    finally
    {
        olecon.Close();
    }
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    OleDbCommand cmd = new OleDbCommand("Select [code] FROM ["+comboBox1.SelectedItem+"$] ", olecon);
    olecon.Open();
    OleDbDataReader dReader;
    dReader = cmd.ExecuteReader();
    while (dReader.Read())
    {
        string s = dReader[0].ToString();


    }
    olecon.Close();
}

Here i browse the excel sheet and i count and display in combo box, then in combo selected event i need to count the particular sheet rows as said above.

Answer 1

在最初计算组合框时，使用字符串比较来查看它是否包含VPUDB或VPULN ，如果是，则增加计数器。

Answer 2

try linq like this will resolve your issue

 var query = from row in dTable.AsEnumerable()
             where ((row.Field<string>("columnname")).contains("VPUDB")
                   || (row.Field<string>("columnname")).contains("VPULN"))

      select row;