读取和导出下载 excel 2003,2007 资料

    protected void Page_Load(object sender, EventArgs e)
    {
        //直接在bin add referece search Microsoft.Office.Interop.Excel.dll (.net 4.5 version 好像是是 1.4.0.0.0)
        string filePath = Request.MapPath(@"~excelsomeData.xlsx"); //excel文件路径(server path)
        string sheetName = "Sheet1"; //文件中，哪一个sheet
        string connectionString07 = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=YES'", filePath);
        //string connectionString03 = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0", filePath);               
        string query = String.Format("select * from [{0}$]", sheetName); 
        OleDbConnection connection = new OleDbConnection(connectionString07);
        OleDbDataAdapter adapter = new OleDbDataAdapter(query, connectionString07);
        DataSet dataSet = new DataSet();
        adapter.Fill(dataSet);
        DataTable table = dataSet.Tables[0];        
    }

注意 : 如果读取后要insert to SQL， 要注意格式和字的长度，把最长的放最上面，微软默认会依据前面8 rows来决定类型和长度等等。(如果遇到问题可以参考)

导出 excel 让游览器下载 (not ajax)

首先使用这个插件 http://epplus.codeplex.com/documentation (nuget可以下载)

更多功能介绍 : http://www.codeproject.com/Articles/680421/Create-Read-Edit-Advance-Excel-Report-in

refer : https://www.paragon-inc.com/resources/blogs-posts/easy_excel_interaction_pt1

然后 code : 

using OfficeOpenXml;

public class Person
{
    public string name { get; set; }
    public int age { get; set; }
    public bool isOK { get; set; }
    public DateTimeOffset dt { get; set; }
    public double dou { get; set; }
}
protected void Page_Load(object sender, EventArgs e)
{
    try
    {
        List<Person> persons = new List<Person> { 
            new Person { name = "keatkeat", age = 10,isOK = false,dt = DateTimeOffset.Now,dou = 50.66 }, 
            new Person { name = "xinyao", age = 12,isOK = true,dt = DateTimeOffset.Now,dou = 50.00 } };

        using (ExcelPackage pck = new ExcelPackage())
        {
            //Create the worksheet
            ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Demo");
            ws.Cells["A1"].LoadFromCollection<Person>(persons, true); //load data from collection 
            Response.Clear();
            Response.AddHeader("content-disposition", "attachment;  filename=file.xlsx"); //file name
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.BinaryWrite(pck.GetAsByteArray());
            Response.End();
        }
    }
    catch (Exception ex)
    {
        throw;
    }
}

建议是开一个独立的 web form page 来处理，前端可以简单的用 window popup 来做下载 ^^ 

一些常用的 Excel 操作 : 

merge & center 

var cells = ws.Cells[1, 1, 1, 5]; //FromRow, FromColumn, ToRow, ToColumn , 是从1开始的不是0哦
cells = ws.Cells["A1,A2"]; //"A1,A2" 我们叫 address
cells.Merge = true;
cells.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;

Read data from excel

System.IO.FileInfo file = new System.IO.FileInfo(Server.MapPath(@"~	est.xlsx"));
using (ExcelPackage excel = new ExcelPackage(file))
{
    ExcelWorksheet worksheet = excel.Workbook.Worksheets.First(s => s.Name == "table1");
    //table size
    //算法 : 假设你在 B2 写一个值，那么 row 是 2, column 是 2 
    var rowCount = worksheet.Dimension.End.Row;  
    var columnCount = worksheet.Dimension.End.Column;

    //first row is columns 
    var x = worksheet.Cells["A1,A2"]; //"A1,A2" 我们叫 address

    foreach (var firstRowCell in worksheet.Cells[1, 1, 1, columnCount]) 
    {          
        string value = firstRowCell.Text;                    
    }

    //second row is data
    for (var rowNumber = 2; rowNumber <= worksheet.Dimension.End.Row; rowNumber++)
    {
        var row = worksheet.Cells[rowNumber, 1, rowNumber, worksheet.Dimension.End.Column];
        foreach (var cell in row)
        {
            bool isDate = cell.Value is DateTime; //check 类型
            string format = cell.Style.Numberformat.Format; //check format 
            string value = cell.Text;                                                              
        }   
    }
}