ExcelHelp 学习笔记一： C#读取Excel中数据

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.OleDb;

namespace ExcelApplication
{
public static class ExcelHelp
{
//////该方式可以读取.xls以及.xlsx文件
private const string connectionString = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source={0};Extended Properties='Excel 12.0; HDR=NO; IMEX=1'";

//"Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath + ";" + "Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";
　　　　　　
private static OleDbConnection getOleDbConnection(string filePath)
{
return new OleDbConnection(string.Format(connectionString, filePath));
}

public static DataTable GetDatasByDataTable(string filePath, string sheetName)
{
DataTable datatable = new DataTable();

OleDbConnection connection = getOleDbConnection(filePath);

try
{
connection.Open();

if (string.IsNullOrEmpty(sheetName))
{
System.Data.DataTable SheetTable = connection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);

sheetName = SheetTable.Rows[0]["Table_Name"].ToString();

if (sheetName == "_xlnm#_FilterDatabase")
{
sheetName = SheetTable.Rows[1]["Table_Name"].ToString();
}

sheetName = sheetName.Remove(sheetName.Length - 1, 1);
}

　　　　　　　　　/////在此处的SQL语句中，sheetName必须使用“[sheetName$]”进行打包起来，否则读取不了数据
string strExcel = string.Format("select * from [{0}$]", sheetName);

OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, connection);

DataSet ds = new DataSet();
adapter.Fill(ds, sheetName);
datatable = ds.Tables[sheetName];

return datatable;
}
catch (Exception e)
{
throw new Exception("读取Excel数据失败");
}
finally
{
connection.Close();
}
}
}
}

string filePath = this.textBox1.Text.Trim();

if (string.Empty.Equals(filePath))
{
MessageBox.Show("请选择Excel文件");
return;
}

DataTable result = ExcelHelp.GetDatasByDataTable(filePath, null);

for (var i = 0; i < result.Rows.Count; i++)
{
for (var j = 0; j < result.Columns.Count; j++)
{
var item = result.Rows[i][j].ToString();
　　　　　　　　　　　　////此处的item 就是获取到的Excel中的值，可以用于做业务数据处理
}
}