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:

C#实现Excel动态生成PivotTable_第1张图片

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:

C#实现Excel动态生成PivotTable_第2张图片

 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" %>





  Excel PivotTable
   


  

Excel PivotTable


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:

C#实现Excel动态生成PivotTable_第3张图片

 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:

C#实现Excel动态生成PivotTable_第4张图片

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