C# 读取Excel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using System.Data;
using System.Data.OleDb;

namespace Collector.Helper
{
    public static class ExcelHelper
    {

        public static System.Collections.Generic.List<string> GetTables(string filepath)
        { 
            List<string> r=new List<string>();
            if (File.Exists(filepath))
            {
                //string connStr="Provider=Microsoft.Jet." + "OLEDB.4.0;Extended Properties=\"Excel 8.0\";Data Source=" + filepath;
                string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;data source=" + filepath + ";Extended Properties='Excel 12.0 Xml;HDR=YES'";
                using (OleDbConnection conn = new OleDbConnection(connStr))
                {
                    conn.Open();
                    DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        r.Add(dt.Rows[i][2].ToString().Trim());
                    }
                }
            }
            return r;
        }

        public static DataTable GetTableData(string filepath,string tableName)
        {
            DataTable r = new DataTable();
            if (File.Exists(filepath))
            {
                //string connStr = "Provider=Microsoft.Jet." + "OLEDB.4.0;Extended Properties=\"Excel 8.0;HDR=FALSE;IMEX=1\";Data Source=" + filepath;
                string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;data source=" + filepath + ";Extended Properties='Excel 12.0 Xml;HDR=YES'";
                using (OleDbConnection conn = new OleDbConnection(connStr))
                {
                    conn.Open();
                    string sql = "select * from [" + tableName+ "]";
                    OleDbCommand oc = new OleDbCommand(sql, conn);
                    OleDbDataAdapter oda = new OleDbDataAdapter(oc);
                    oda.Fill(r);
                }
            }
            return r;
        }

        public static System.Collections.Generic.List<string> GetTableFields(string filepath, string tableName)
        {
            List<string> r=new List<string>();
            if (File.Exists(filepath))
            {
                //string connStr = "Provider=Microsoft.Jet." + "OLEDB.4.0;Extended Properties=\"Excel 8.0;HDR=FALSE;IMEX=1\";Data Source=" + filepath;
                string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;data source=" + filepath + ";Extended Properties='Excel 12.0 Xml;HDR=YES'";
                using (OleDbConnection conn = new OleDbConnection(connStr))
                {
                    conn.Open();
                    string sql = "select * from [" + tableName + "] where 1=2";
                    OleDbCommand oc = new OleDbCommand(sql, conn);
                    OleDbDataAdapter oda = new OleDbDataAdapter(oc);
                    DataTable dt = new DataTable();
                    oda.Fill(dt);
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        r.Add(dt.Columns[i].Caption);
                    }
                }
            }
            return r;
        }
    


    }
}