Excel文件操作类

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

namespace Hxh.API
{
 /// <summary>
 /// ExcelOpration 的摘要说明。
 /// </summary>
 public class ExcelOpration
 {
  OleDbConnection Conn;
  string connString ;
  string FileName;

  public ExcelOpration()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }
  public ExcelOpration(string _FileName)
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
   FileName = _FileName;
  }

  /// <summary>
  /// 打开连接
  /// </summary>
  private void Open()
  {
   if(Conn==null)
   {
    //在此处设置访问的数据库文件
    connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + FileName +";Extended Properties=Excel 8.0;";
    Conn=new OleDbConnection(connString);
    Conn.Open();

   }
   else if(Conn.State==System.Data.ConnectionState.Closed)
    Conn.Open();

  }

  /// <summary>
  /// 关闭连接
  /// </summary>
  public void Close()
  {
   if (Conn != null)
    Conn.Close();
  }

  /// <summary>
  /// 导入数据到Excel
  /// </summary>
  /// <param name="OutTable"></param>
  public void ImportData(DataTable OutTable)
  {
   CreateExcel(OutTable);
   InsertData(OutTable);
  }

  /// <summary>
  /// 创建Excel文件和表头
  /// </summary>
  private void CreateExcel(DataTable OutTable)
  {
   StringBuilder sb = new StringBuilder();
   if(File.Exists(FileName))
   {
    File.Delete(FileName);
   }
   sb.Append("create table Sheet1(");
   foreach(DataColumn col in OutTable.Columns)
   {
    sb.Append(col.ColumnName+" varchar,");
   }
   sb.Remove(sb.Length-1,1);
   sb.Append(")");
   Open();
   OleDbCommand OleCmd = new OleDbCommand();
   OleCmd.Connection = Conn;
   OleCmd.CommandText = sb.ToString();
   OleCmd.ExecuteNonQuery();
   Close();
  }

  /// <summary>
  /// 插入数据
  /// </summary>
  private void InsertData(DataTable OutTable)
  {
   OleDbCommand OleCmd = new OleDbCommand();
   OleDbParameter[] parm=new OleDbParameter[OutTable.Columns.Count];
   StringBuilder sb = new StringBuilder();
   sb.Append("insert into Sheet1 values(");
   for(int i=0;i<OutTable.Columns.Count;i++)
   {
    parm[i]=new OleDbParameter("@P"+OutTable.Columns[i].ColumnName,OleDbType.VarChar);
    sb.Append("@P"+OutTable.Columns[i].ColumnName+",");
    OleCmd.Parameters.Add(parm[i]);
   }
   sb.Remove(sb.Length-1,1);
   sb.Append(")");
   Open();
   OleCmd.Connection = Conn;
   OleCmd.CommandText = sb.ToString();
   foreach(DataRow row in OutTable.Rows)
   {
    for(int i=0;i<OutTable.Columns.Count;i++)
    {
     parm[i].Value = row[OutTable.Columns[i].ColumnName].ToString().Trim();
    }

    OleCmd.ExecuteNonQuery();
   }
   Close();

  }

  /// <summary>
  /// 从Excel输出数据到数据集
  /// </summary>
  /// <returns></returns>
  public DataSet OutPortData()
  {
   DataSet ds = new DataSet();
   Open();
   OleDbDataAdapter myAdapter = new OleDbDataAdapter("select * from [Sheet1$]", Conn);
   myAdapter.Fill(ds,"Input");
   Close();
   return ds;
  }

 }
}