Excel 导入 DataSet 的类

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

namespace Legendigital.Swim.Common
{
    /// <summary>
    /// Summary description for Excel.
    /// </summary>
    public class Excel
     {
        private const string STRING_CONECTTIONSTRING = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties="Excel 8.0;HDR=Yes;IMEX=1;"";
        public Excel()
         {
            //
            // TODO: Add constructor logic here
            //
         }
        public static DataTable GetDataTable(string excelFilePath,string sql)
         {
            try
             {
                 DataSet ds = new DataSet();
                string connstring = string.Format(STRING_CONECTTIONSTRING,excelFilePath);
                using(OleDbConnection cnn = new OleDbConnection(connstring))
                 {
                     cnn.Open();
                     OleDbDataAdapter dataAdapter = new OleDbDataAdapter(sql,cnn);
                     dataAdapter.Fill(ds);
                     cnn.Close();
                    return ds.Tables[0];
                 }
             }
            finally
             {        
             }
         }
        public static DataSet FillDataSet(string excelFilePath,string sql,DataSet ds)
         {
             DataTable dt = GetDataTable(excelFilePath,sql);

            foreach(DataRow dr in dt.Rows)
             {
                try
                 {
                     DataRow newdr = ds.Tables[0].NewRow();
                    foreach(DataColumn dc in dt.Columns)
                     {
                        if(ds.Tables[0].Columns.Contains(dc.ColumnName))
                         {
                             newdr[dc.ColumnName] = dr[dc.ColumnName];                            
                         }
                     }
                     ds.Tables[0].Rows.Add(newdr);
                 }
                catch
                 {

                 }
             }

             ds.AcceptChanges();

            return ds;
            
         }
     }
}