使用OleDB保存数据到Excel

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Text;
using  System.Data.OleDb;
using  System.Collections.Specialized;
using  System.IO;
using  System.Reflection;

类内容：

 

代码

namespace  Jd.RestoreNotify.Data
{
     public   static   class  ExcelHelper
    {
         ///   <summary>
         ///  
         ///   </summary>
         ///   <typeparam name="T"> Model类型 </typeparam>
         ///   <param name="list"> 列表 </param>
         ///   <param name="tmppath"> 模板文件（空的excel文件）地址 </param>
         ///   <param name="outputpath"> 要输出的地址 </param>
         ///   <param name="sheetname"> excel的sheet名称 </param>
         ///   <param name="propdict"> 要导出的列名列表 </param>
         ///   <returns></returns>
         public   static   bool  ExportToExcel < T > (IList < T >  list,  string  tmppath,  string  outputpath,  string  sheetname, NameValueCollection propdict)
             where  T :  class
        {
             if  (list  ==   null   ||  list.Count  ==   0 )
            {
                 throw   new  ArgumentNullException( " 该列表没有实际的值 " ,  " list " );
            }

             #region  判断模板文件、保存路径
             if  ( ! File.Exists(tmppath))
            {
                 throw   new  FileNotFoundException( " 模板文件路径不正确，找不到模板文件 " );
            }
             if  (File.Exists(outputpath))
            {
                File.Delete(outputpath);
            }
            File.Copy(tmppath, outputpath);
             #endregion
            sheetname  =   string .IsNullOrEmpty(sheetname)  ?   " Sheet1 "  : sheetname;
             string  excelconntext  =   " Provider=Microsoft.Jet.OleDB.4.0;Data Source= "   +  outputpath  +   " ;Extended Properties = \ " Excel  8.0 ;HDR = Yes;\ "" ;

             using  (OleDbConnection cn  =   new  OleDbConnection(excelconntext))
            {
                cn.Open();
                OleDbCommand com  =  cn.CreateCommand();
                PropertyInfo[] ps  =   typeof (T).GetProperties();
                List < PropertyInfo >  proplist  =   new  List < PropertyInfo > ();
                StringBuilder sb  =   new  StringBuilder();
                sb.Append( " Create Table [ "   +  sheetname  +   " $]( " );

                StringBuilder sb2  =   new  StringBuilder();
                sb2.Append( " Insert into [ "   +  sheetname  +   " $] values( " );
                 foreach  (var item  in  ps)
                {
                     string  head  =  propdict[item.Name];
                     if  ( string .IsNullOrEmpty(head))  continue ;
                     else  proplist.Add(item);
                    sb.Append(head  +   "   " );
                     switch  (item.PropertyType.Name)
                    {
                         case   " String " : sb.Append( " Char, " );  break ;
                         case   " Decimal " : sb.Append( " Decimal, " );  break ;
                         case   " DateTime " : sb.Append( " Char, " );  break ;
                         case   " Int32 " : sb.Append( " Integer, " );  break ;
                         default : sb.Append( " Char, " );
                             break ;
                    }
                    sb2.Append( " @ "   +  item.Name  +   "  , " );
                }
                com.CommandText  =  sb.ToString().Trim( ' , ' )  +   " ) " ;
                com.ExecuteNonQuery(); // 创建表头

                com.CommandText  =  sb2.ToString().Trim( ' , ' )  +   " ) " ;

                 foreach  (var item  in  list)
                {
                    OleDbParameter[] pars  =   new  OleDbParameter[proplist.Count];
                     for  ( int  i  =   0 ; i  <  proplist.Count; i ++ )
                    {
                        pars[i]  =   new  OleDbParameter(proplist[i].Name, proplist[i].GetValue(item,  null )  ??   "" );
                    }
                    com.Parameters.Clear();
                    com.Parameters.AddRange(pars);
                    com.ExecuteNonQuery(); // 写入每行的数据
                }
            }

             return   true ;
        }
    }
}