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;
            
         }
     }
}