C#实现Excel动态生成PivotTable

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：

<%@ 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>

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：

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);
      }
    }
  }
}

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