读取Excel数据

Excel2007的连接字串与Excel2003的不同。

DataTable tbSheetName = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
用来获得sheet的名字

using System;

using System.IO;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.Data.OleDb;

 

namespace ExcelDataReader

{

    public class ExcelDataReader

    {

        private static string BuildConnectionString(string filepath)

        {

            if (!File.Exists(filepath))

            {

                throw new FileNotFoundException("Cannot find file" + filepath);

            }

 

            switch (Path.GetExtension(filepath))

            {

                case ".xls":

                    return "Provider=Microsoft.Jet.OleDb.4.0;Data Source='" + filepath + "';Extended Properties='Excel 8.0;HDR=YES'";

                case ".xlsx":

                    return "Provider=Microsoft.Ace.OleDb.12.0;Data Source='" + filepath + "';Extended Properties='Excel 12.0;HDR=YES'";

                default:

                    throw new NotSupportedException("The file is not a valid excel file");

            }

        }

 

        public static DataSet Read(string filepath)

        {

            DataSet dataset = new DataSet();

 

            string connect = BuildConnectionString(filepath);

 

            string query = string.Empty;

 

            using (OleDbConnection connection = new OleDbConnection(connect))

            {

                if (connection.State == ConnectionState.Closed)

                {

                    connection.Open();

                }

 

                DataTable tbSheetName = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

 

                if (tbSheetName != null && tbSheetName.Rows.Count > 0)

                {

                    foreach (DataRow row in tbSheetName.Rows)

                    {

                        string sheetname = row["TABLE_NAME"].ToString();

 

                        if (sheetname.EndsWith("$"))

                        {

                            sheetname = sheetname.TrimEnd('$');

                        }

 

                        query = string.Format("Select * from [{0}$]", sheetname);

 

                        using (OleDbDataAdapter adp = new OleDbDataAdapter(query, connection))

                        {

                            DataTable table = new DataTable(sheetname);

                            adp.Fill(table);

 

                            dataset.Tables.Add(table);

                        }

                    }

                }

            }

 

            return dataset;

        }

    }

}