通过C＃windows应用程序从Excel 2016中读取数据

Question

我正在研究一个应用程序，我想通过C＃windows应用程序从excel 2016中读取数据。我写的代码（见下面代码）在excel文件打开时工作正常。但是，当我在Excel文件未打开时运行代码时，它会抛出OleDbexception“外部表格未处于预期格式。”

using System.Data.OleDb; 
using System; 

namespace ExcelRead 
{ 
class Program 
{ 
    static void Main(string[] args) 
    { 
     OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source='D:\Practice.xlsx';Extended Properties='Excel 8.0;HDR=Yes;'"); 
     con.Open(); 
     OleDbCommand cmd = new OleDbCommand("select * from [sheet1$];", con); 
     OleDbDataReader dr = cmd.ExecuteReader(); 
     while (dr.Read()) 
     { 
      Console.WriteLine(dr.GetString(0) + "\t" + dr.GetString(1) + "\t" + dr.GetString(2)); 
     } 
     Console.ReadKey(); 
    } 
    } 
} 

Answer 1

请使用下面的代码，因为你不保持连接，可产生的excel表，这就是为什么你得到错误的实例。

static void Main(string[] args) 
    { 
      // Create Connection to Excel Workbook 
      using (OleDbConnection connection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source='D:\Practice.xlsx';Extended Properties='Excel 8.0;HDR=Yes;'")) 
      { 
       OleDbCommand command = new OleDbCommand("Select * FROM [Sheet1$]", connection); 
       connection.Open(); 
       // Create DbDataReader to Data Worksheet 
       using (OleDbDataReader dr = command.ExecuteReader()) 
       { 
        Console.WriteLine(dr.GetString(0) + "\t" + dr.GetString(1) + "\t" + dr.GetString(2)); 
       } 
      } 
     Console.ReadKey(); 
    }