excel 中的透视表对于数据分析来说，非常的方便，而且很多业务人员对于excel的操作也是非常熟悉的，因此用excel作为分析数据的界面，不失为一种很好的选择。那么如何用c#从数据库中抓取数据，并在excel 动态生成pivottable呢？下面结合实例来说明。
一般来说，数据库的设计都遵循规范化的原则，从而减少数据的冗余，但是对于数据分析来说，数据冗余能够提高数据加载的速度，因此为了演示透视表，这里现在数据库中建立一个视图，将需要分析的数据整合到一个视图中。如下图所示：
数据源准备好后，我们先来建立一个web应用程序，然后用nuget加载epplus程序包，如下图所示：
在index.aspx前台页面中，编写如下脚本：
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<%@ page language="c#" autoeventwireup="true" codebehind="index.aspx.cs" inherits="excelpivot.web.index" %>
<!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>excel pivottable</title>
<link rel="stylesheet" type="text/css" href="css/style.css" />
</head>
<body>
<form id="form1" runat="server">
<div id="container">
<div id="contents">
<div id="post">
<header>
<h1> excel pivottable </h1>
</header>
<div id="metro-array" style="display: inline-block;">
<div style="width: 230px; height: 230px; float: left; ">
<a class="metro-tile" style="cursor: pointer; width: 230px; height: 110px; display: block; background-color:#ff0000; color: #fff; margin-bottom: 10px;">
<input type="button" runat="server" id="button1" name="btn1" value="回款情况分析" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:230px; height:110px; cursor:pointer;"/>
</a>
<a class="metro-tile" style="cursor: pointer; width: 230px; height: 110px; display: block; background-color:#ff6a00; color: #fff;">
<input type="button" runat="server" id="button2" name="btn1" value="sampe1" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:230px; height:110px; cursor:pointer;"/>
</a>
</div>
<div style="width: 230px; height: 230px; float: left; margin-left: 10px">
<a class="metro-tile" style="cursor: pointer; width: 230px; height: 230px; display: block; background-color:#ffd800; color: #fff">
<input type="button" runat="server" id="btn1" name="btn1" value="sampe1" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:230px; height:230px; cursor:pointer;"/>
</a>
</div>
<div style="width: 230px; height: 230px; float: left; margin-left: 10px">
<a class="metro-tile" style="cursor: pointer; width: 230px; height: 110px; display: block; background-color:#0094ff; color: #fff; margin-bottom: 10px;">
<input type="button" runat="server" id="button3" name="btn1" value="sampe1" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:230px; height:110px; cursor:pointer;"/>
</a>
<a class="metro-tile" style="cursor: pointer; width: 110px; height: 110px; margin-right: 10px; display: block; float: left; background-color: #4800ff; color: #fff;">
<input type="button" runat="server" id="button4" name="btn1" value="sampe1" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:110px; height:110px; cursor:pointer;"/>
</a>
<a class="metro-tile" style="cursor: pointer; width: 110px; height: 110px; display: block; background-color: #b200ff; float: right; color: #fff;">
<input type="button" runat="server" id="button5" name="btn1" value="sampe1" onserverclick="btn1_serverclick"
style="background-color:transparent; color:white; font-size:16px;float:left; border:0; width:110px; height:110px; cursor:pointer;"/>
</a>
</div>
</div>
</div>
</div>
</div>
</form>
</body>
<script src="js/tilejs.js" type="text/javascript"></script>
</html>
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其中 tilejs是一个开源的构建类似win8 metro风格的javascript库。
编写后台脚本：
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using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using officeopenxml;
using officeopenxml.table;
using officeopenxml.conditionalformatting;
using officeopenxml.style;
using officeopenxml.utils;
using officeopenxml.table.pivottable;
using system.io;
using system.data.sqlclient;
using system.data;
namespace excelpivot.web
{
public partial class index : system.web.ui.page
{
protected void page_load(object sender, eventargs e)
{
}
private datatable getdatasource()
{
//createdatatable();
//return productinfo;
sqlconnection conn = new sqlconnection();
conn.connectionstring = "data source=.;initial catalog=olap;persist security info=true;user id=sa;password=sa";
conn.open();
sqldataadapter ada = new sqldataadapter("select * from v_pm_olap_test", conn);
dataset ds = new dataset();
ada.fill(ds);
return ds.tables[0];
}
protected void btn1_serverclick(object sender, eventargs e)
{
try
{
datatable table = getdatasource();
string path = "_demo_" + system.guid.newguid().tostring().replace("-", "_") + ".xls";
//string path = "_demo.xls";
fileinfo fileinfo = new fileinfo(path);
var excel = new excelpackage(fileinfo);
var wspivot = excel.workbook.worksheets.add("pivot");
var wsdata = excel.workbook.worksheets.add("data");
wsdata.cells["a1"].loadfromdatatable(table, true, officeopenxml.table.tablestyles.medium6);
if (table.rows.count != 0)
{
foreach (datacolumn col in table.columns)
{
if (col.datatype == typeof(system.datetime))
{
var colnumber = col.ordinal + 1;
var range = wsdata.cells[2, colnumber, table.rows.count + 1, colnumber];
range.style.numberformat.format = "yyyy-mm-dd";
}
else
{
}
}
}
var datarange = wsdata.cells[wsdata.dimension.address.tostring()];
datarange.autofitcolumns();
var pivottable = wspivot.pivottables.add(wspivot.cells["a1"], datarange, "pivot");
pivottable.multiplefieldfilters = true;
pivottable.rowgrandtotals = true;
pivottable.columgrandtotals = true;
pivottable.compact = true;
pivottable.compactdata = true;
pivottable.griddropzones = false;
pivottable.outline = false;
pivottable.outlinedata = false;
pivottable.showerror = true;
pivottable.errorcaption = "[error]";
pivottable.showheaders = true;
pivottable.useautoformatting = true;
pivottable.applywidthheightformats = true;
pivottable.showdrill = true;
pivottable.firstdatacol = 3;
//pivottable.rowheadercaption = "行";
//row field
var field004 = pivottable.fields["销售客户经理"];
pivottable.rowfields.add(field004);
var field001 = pivottable.fields["项目简称"];
pivottable.rowfields.add(field001);
//field001.showall = false;
//column field
var field002 = pivottable.fields["年"];
pivottable.columnfields.add(field002);
field002.sort = officeopenxml.table.pivottable.esorttype.ascending;
var field005 = pivottable.fields["月"];
pivottable.columnfields.add(field005);
field005.sort = officeopenxml.table.pivottable.esorttype.ascending;
//data field
var field003 = pivottable.fields["回款金额"];
field003.sort = officeopenxml.table.pivottable.esorttype.descending;
pivottable.datafields.add(field003);
pivottable.rowgrandtotals = false;
pivottable.columgrandtotals = false;
//save file
excel.save();
//open excel file
string file = @"c:\windows\explorer.exe";
system.diagnostics.process.start(file, path);
}
catch (exception ex)
{
response.write(ex.message);
}
}
}
}
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编译运行，如下图所示：
单击 [回款情况分析]，稍等片刻，会打开excel，并自动生成透视表，如下图所示：
以上就是本文的全部内容，希望对大家的学习有所帮助