浮雲雅築: [研究][C#][ASP.NET] GridView 匯出成 .xls (使用 Excel )

[研究][C#][ASP.NET] GridView 匯出成 .xls (使用 Excel )

2016-03-02

參考這篇修改使用的
http://www.encodedna.com/2013/01/asp.net-export-to-excel.htm

幾點注意事項：

電腦上必須安裝 Excel 商業版本 ( Excel Viewer 實際測試無效)
MS-SQL Server 上先建立一個資料庫 TestDB，裡面有個資料表 TestTable，有兩個欄位 no 和 myname，隨邊輸入幾筆資料。
測試環境是 Visual Studio 2015 + Excel 2010 + SQL Server 2014

Default.aspx 內容為

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

<p><input type="button" onserverclick="ExportToExcel"
value="Export data to Excel" runat="server" /></p>


<p><asp:Label ID="lblConfirm" Text="" runat="server"></asp:Label></p>

<div>

<div style="float:left;padding-right:10px;">
<input type="button" onserverclick="ViewData"
id="btView" value="View Data" runat="server"
style="display:none;" />
</div>


<div style="float:left;">
<asp:Button ID="btDownLoadFile" Text="Download"
OnClick="DownLoadFile" runat="server" style="display:none;" />
</div>
</div>
</div>
</form>
</body>
</html>

Default.aspx.cs 內容

using System;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Text;
using System.Web;

// Visual Studio 2015 要加入 "參考"，參考名稱的 "Microsoft Excel 14.0 Object Library"
// 電腦可能要安裝 Microsoft Office 2010
using Excel = Microsoft.Office.Interop.Excel;
using ExcelAutoFormat = Microsoft.Office.Interop.Excel.XlRangeAutoFormat;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ExportToExcel(object sender, EventArgs e)
{
string sCon = "Data Source=.;Persist Security Info=False;Integrated Security=SSPI;" +
"Initial Catalog=TestDB;User Id=sa;Password=P@ssw0rd;Connect Timeout=30;";

using (SqlConnection con = new SqlConnection(sCon))
{
using (SqlCommand cmd = new SqlCommand("SELECT * FROM TestTable"))
{
SqlDataAdapter sda = new SqlDataAdapter();
try
{
cmd.Connection = con;
con.Open();
sda.SelectCommand = cmd;

DataTable dt = new DataTable();
sda.Fill(dt);

if (dt.Rows.Count > 0)
{
string path = Server.MapPath("exportedfiles\\");

if (!Directory.Exists(path)) // CHECK IF THE FOLDER EXISTS. IF NOT, CREATE A NEW FOLDER.
{
Directory.CreateDirectory(path);
}

File.Delete(path + "EmployeeDetails.xlsx"); // DELETE THE FILE BEFORE CREATING A NEW ONE.

// ADD A WORKBOOK USING THE EXCEL APPLICATION.
Excel.Application xlAppToExport = new Excel.Application();
xlAppToExport.Workbooks.Add("");

// ADD A WORKSHEET.
Excel.Worksheet xlWorkSheetToExport = default(Excel.Worksheet);
//xlWorkSheetToExport = (Excel.Worksheet)xlAppToExport.Sheets["Sheet1"];
xlWorkSheetToExport = (Excel.Worksheet)xlAppToExport.Sheets["工作表1"]; // 繁體中文版Excel要改用 "工作表1"

// ROW ID FROM WHERE THE DATA STARTS SHOWING.
//int iRowCnt = 4;
int iRowCnt = 3;

// SHOW THE HEADER.
xlWorkSheetToExport.Cells[1, 1] = "Employee Details";

Excel.Range range = xlWorkSheetToExport.Cells[1, 1] as Excel.Range;
range.EntireRow.Font.Name = "Calibri";
range.EntireRow.Font.Bold = true;
range.EntireRow.Font.Size = 20;

xlWorkSheetToExport.Range["A1:D1"].MergeCells = true; // MERGE CELLS OF THE HEADER.

// SHOW COLUMNS ON THE TOP.
//xlWorkSheetToExport.Cells[iRowCnt - 1, 1] = "Employee Name";
//xlWorkSheetToExport.Cells[iRowCnt - 1, 2] = "Mobile No.";
//xlWorkSheetToExport.Cells[iRowCnt - 1, 3] = "PresentAddress";
//xlWorkSheetToExport.Cells[iRowCnt - 1, 4] = "Email Address";

xlWorkSheetToExport.Cells[iRowCnt - 1, 1] = "編號";
xlWorkSheetToExport.Cells[iRowCnt - 1, 2] = "姓名";
xlWorkSheetToExport.Cells[iRowCnt - 1, 3] = "住址";

int i;
for (i = 0; i <= dt.Rows.Count - 1; i++)
{
//xlWorkSheetToExport.Cells[iRowCnt, 1] = dt.Rows[i].Field("EmpName");
//xlWorkSheetToExport.Cells[iRowCnt, 2] = dt.Rows[i].Field("Mobile");
//xlWorkSheetToExport.Cells[iRowCnt, 3] = dt.Rows[i].Field("PresentAddress");
//xlWorkSheetToExport.Cells[iRowCnt, 4] = dt.Rows[i].Field("Email");

//xlWorkSheetToExport.Cells[iRowCnt, 1] = (int)dt.Rows[i].Field("no");
//xlWorkSheetToExport.Cells[iRowCnt, 2] = dt.Rows[i].Field("myname");

xlWorkSheetToExport.Cells[iRowCnt, 1] = dt.Rows[i]["no"];
xlWorkSheetToExport.Cells[iRowCnt, 2] = dt.Rows[i]["myname"];
xlWorkSheetToExport.Cells[iRowCnt, 3] = dt.Rows[i]["addr"];

iRowCnt = iRowCnt + 1;
}

// FINALLY, FORMAT THE EXCEL SHEET USING EXCEL'S AUTOFORMAT FUNCTION.
//Excel.Range range1 = xlAppToExport.ActiveCell.Worksheet.Cells[4, 1] as Excel.Range;
Excel.Range range1 = xlAppToExport.ActiveCell.Worksheet.Cells[3, 1] as Excel.Range;
range1.AutoFormat(ExcelAutoFormat.xlRangeAutoFormatList3);

// SAVE THE FILE IN A FOLDER.
xlWorkSheetToExport.SaveAs(path + "EmployeeDetails.xlsx");

// CLEAR.
xlAppToExport.Workbooks.Close();
xlAppToExport.Quit();
xlAppToExport = null;
xlWorkSheetToExport = null;

lblConfirm.Text = "Data Exported Successfully";
lblConfirm.Attributes.Add("style", "color:green; font: normal 14px Verdana;");
btView.Attributes.Add("style", "display:block");
btDownLoadFile.Attributes.Add("style", "display:block");
}
}
catch (Exception ex)
{
lblConfirm.Text = ex.Message.ToString();
lblConfirm.Attributes.Add("style", "color:red; font: bold 14px/16px Sans-Serif,Arial");
}
finally
{
sda.Dispose();
sda = null;
}
}
}
}

// VIEW THE EXPORTED EXCEL DATA.
protected void ViewData(object sender, System.EventArgs e)
{
// 如果直接開啟檔案內容，開啟第二次會出現錯誤
// 由於另一個處理序正在使用檔案 'C:\CodeTemp\WebSite2\exportedfiles\EmployeeDetails.xlsx'，所以無法存取該檔案。

string path = Server.MapPath("exportedfiles\\");
try
{
// CHECK IF THE FOLDER EXISTS.
if (Directory.Exists(path))
{
// CHECK IF THE FILE EXISTS.
if (File.Exists(path + "EmployeeDetails.xlsx"))
{
// SHOW (NOT DOWNLOAD) THE EXCEL FILE.
Excel.Application xlAppToView = new Excel.Application();
xlAppToView.Workbooks.Open(path + "EmployeeDetails.xlsx");
xlAppToView.Visible = true;
}
}
}
catch (Exception ex)
{
//
}
}
// DOWNLOAD THE FILE.
protected void DownLoadFile(object sender, EventArgs e)
{
try
{
string sPath = Server.MapPath("exportedfiles\\");

string fileName = "匯出檔案";
Response.Clear();

Response.AppendHeader("Content-Disposition", "attachment; filename=EmployeeDetails.xlsx");
//Response.ContentEncoding = Encoding.GetEncoding(950);//950就是所謂的BIG5
//Response.AddHeader("Content-Disposition", "attachment;filename=\"" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls\"");

Response.TransmitFile(sPath + "EmployeeDetails.xlsx");
//Response.TransmitFile(sPath + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls\"");
Response.End();
}
catch (Exception ex) { }
}
}

(完)

浮雲雅築

2016年3月2日星期三

[研究][C#][ASP.NET] GridView 匯出成 .xls (使用 Excel )

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張貼留言

2016年3月2日 星期三

[研究][C#][ASP.NET] GridView 匯出成 .xls (使用 Excel )

沒有留言:

張貼留言

2016年3月2日星期三