Excel导入导出DataGridView

 1         /// <summary>
 2         /// excel表保存到dataTable中
 3         /// </summary>
 4         /// <param name="path">excel表路径</param>
 5         /// <returns>返回第一个sheet表</returns>
 6         private static DataTable ExcelToDataTable(string path)
 7         {
 8             DataTable dt = new DataTable();
 9             try
10             {
11                 //连接字符串     
12                 string connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';"; // Office 07及以上版本 不能出现多余的空格 而且分号注意          
13                 //string connstring = Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + path + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';"; //Office 07以下版本     
14                 using (OleDbConnection conn = new OleDbConnection(connstring))
15                 {
16                     conn.Open();
17                     DataTable sheetsName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" }); //得到所有sheet的名字   
18                     string firstSheetName = sheetsName.Rows[0][2].ToString(); //得到第一个sheet的名字      
19                     string sql = string.Format("SELECT * FROM [{0}]", firstSheetName); //查询字符串  
20                     //string sql = string.Format("SELECT * FROM [{0}] WHERE [日期] is not null", firstSheetName); //查询字符串   
21                     OleDbDataAdapter ada = new OleDbDataAdapter(sql, connstring);
22                     DataSet set = new DataSet();
23                     ada.Fill(set);
24                     dt = set.Tables[0];
25                 }
26                 return dt;
27             }
28             catch (Exception ex)
29             {
30                 MessageBox.Show(ex.Message);
31                 return null;
32             }
33         }