我从蒂姆的答案中得出了类似的解决方案。首先,我定义了一个简单的接口,将其用作导出方法的一部分:
public interface IPivotTableCreator
{
void CreatePivotTable(
OfficeOpenXml.ExcelPackage pkg, // reference to the destination book
string tableName, // "tab" name used to generate names for related items
string pivotRangeName); // Named range in the Workbook refers to data
}
然后我实现了一个简单的类,它保存变量值和完成工作的过程代码:
public class SimplePivotTable : IPivotTableCreator
{
List<string> _GroupByColumns;
List<string> _SummaryColumns;
/// <summary>
/// Constructor
/// </summary>
public SimplePivotTable(string[] groupByColumns, string[] summaryColumns)
{
_GroupByColumns = new List<string>(groupByColumns);
_SummaryColumns = new List<string>(summaryColumns);
}
/// <summary>
/// Call-back handler that builds simple PivatTable in Excel
/// http://stackoverflow.com/questions/11650080/epplus-pivot-tables-charts
/// </summary>
public void CreatePivotTable(OfficeOpenXml.ExcelPackage pkg, string tableName, string pivotRangeName)
{
string pageName = "Pivot-" + tableName.Replace(" ", "");
var wsPivot = pkg.Workbook.Worksheets.Add(pageName);
pkg.Workbook.Worksheets.MoveBefore(PageName, tableName);
var dataRange = pkg.Workbook./*Worksheets[tableName].*/Names[pivotRangeName];
var pivotTable = wsPivot.PivotTables.Add(wsPivot.Cells["C3"], dataRange, "Pivot_" + tableName.Replace(" ", ""));
pivotTable.ShowHeaders = true;
pivotTable.UseAutoFormatting = true;
pivotTable.ApplyWidthHeightFormats = true;
pivotTable.ShowDrill = true;
pivotTable.FirstHeaderRow = 1; // first row has headers
pivotTable.FirstDataCol = 1; // first col of data
pivotTable.FirstDataRow = 2; // first row of data
foreach (string row in _GroupByColumns)
{
var field = pivotTable.Fields[row];
pivotTable.RowFields.Add(field);
field.Sort = eSortType.Ascending;
}
foreach (string column in _SummaryColumns)
{
var field = pivotTable.Fields[column];
ExcelPivotTableDataField result = pivotTable.DataFields.Add(field);
}
pivotTable.DataOnRows = false;
}
}
然后我创建一个我的实例SimplePivotTable
创作者类别:
IPivotTableCreator ptCreator = new SimplePivotTable(
new string[] { "OrganizationTitle", "GroupingTitle", "DetailTitle" }, /* collapsible rows */
new string[] { "Baseline", "Increase", "Decrease", "NetChange", "CurrentCount"}); /* summary columns */
我有第三个类,它当前公开了大约六种不同的方法来获取一个或多个数据集(通常是 List 对象),并将每个数据集转换为具有指定数据范围的数据工作表。现在,我正在调整这些导出方法,以便为任何/所有这些导出方法生成数据透视表。他们都做了这样的事情:
OfficeOpenXml.ExcelPackage pkg = new ExcelPackage();
ExportCollectionToExcel(pkg, tableName, dataset); // Create worksheet filled with data
// Creates a NamedRange of data
ptCreator.CreatePivotTable(pkg, tableName, GetPivotRangeName(tableName));
通过使用界面,我留下了更多机会(我认为)来生成多个工作表的不同数据透视表。我的基本SimplePivotTable
类仅用于具有一些特定假设的单个表,但将配置数据放入以表名称为键的字典中并不困难。
希望对某人有帮助。