使用EPPLUS创建数据透视表过滤器

Question

我正在使用EPPLUS excel库。您是否知道如何使用report filters, row label and values创建数据透视表？一些简单的例子非常好。

Answer 1

这是一个简单的例子。请注意，EEPlus不具备页面过滤器的功能，因此您必须使用（按难度顺序）VBA，Excel Interop或XML操作（我在下面使用XML）。您可以将此代码放入EPPlus源代码下载的单元测试中，以便于测试：

const string FORMATCURRENCY = "#,###;[Red](#,###)";

var file = new FileInfo(@"c:\temp\temp.xlsx");
if (file.Exists)
    file.Delete();

var pck = new ExcelPackage(file);
var workbook = pck.Workbook;
var worksheet = workbook.Worksheets.Add("newsheet");

//The data
worksheet.Cells["A20"].Value = "Col1";
worksheet.Cells["A21"].Value = "sdf";
worksheet.Cells["A22"].Value = "wer";
worksheet.Cells["A23"].Value = "ghgh";
worksheet.Cells["A24"].Value = "sdf";
worksheet.Cells["A25"].Value = "wer";
worksheet.Cells["A26"].Value = "ghgh";
worksheet.Cells["A27"].Value = "sdf";
worksheet.Cells["A28"].Value = "wer";
worksheet.Cells["A29"].Value = "ghgh";

worksheet.Cells["B20"].Value = "Col2";
worksheet.Cells["B21"].Value = "Group A";
worksheet.Cells["B22"].Value = "Group B";
worksheet.Cells["B23"].Value = "Group A";
worksheet.Cells["B24"].Value = "Group C";
worksheet.Cells["B25"].Value = "Group A";
worksheet.Cells["B26"].Value = "Group B";
worksheet.Cells["B27"].Value = "Group C";
worksheet.Cells["B28"].Value = "Group C";
worksheet.Cells["B29"].Value = "Group A";

worksheet.Cells["C20"].Value = "Col3";
worksheet.Cells["C21"].Value = 453;
worksheet.Cells["C22"].Value = 634;
worksheet.Cells["C23"].Value = 274;
worksheet.Cells["C24"].Value = 453;
worksheet.Cells["C25"].Value = 634;
worksheet.Cells["C26"].Value = 274;
worksheet.Cells["C27"].Value = 453;
worksheet.Cells["C28"].Value = 634;
worksheet.Cells["C29"].Value = 274;

worksheet.Cells["D20"].Value = "Col4";
worksheet.Cells["D21"].Value = 686468;
worksheet.Cells["D22"].Value = 996440;
worksheet.Cells["D23"].Value = 185780;
worksheet.Cells["D24"].Value = 686468;
worksheet.Cells["D25"].Value = 996440;
worksheet.Cells["D26"].Value = 185780;
worksheet.Cells["D27"].Value = 686468;
worksheet.Cells["D28"].Value = 996440;
worksheet.Cells["D29"].Value = 185780;

//The pivot table
var pivotTable = worksheet.PivotTables.Add(worksheet.Cells["A4"], worksheet.Cells["A20:D29"], "test");

//The label row field
pivotTable.RowFields.Add(pivotTable.Fields["Col1"]);
pivotTable.DataOnRows = false;

//The data fields
var field = pivotTable.DataFields.Add(pivotTable.Fields["Col3"]);
field.Name = "Sum of Col2";
field.Function = DataFieldFunctions.Sum;
field.Format = FORMATCURRENCY;

field = pivotTable.DataFields.Add(pivotTable.Fields["Col4"]);
field.Name = "Sum of Col3";
field.Function = DataFieldFunctions.Sum;
field.Format = FORMATCURRENCY;

//The page field
pivotTable.PageFields.Add(pivotTable.Fields["Col2"]);
var xdCacheDefinition = pivotTable.CacheDefinition.CacheDefinitionXml;
var xeCacheFields = xdCacheDefinition.FirstChild["cacheFields"];
if (xeCacheFields == null)
    return;

//To filter, add items to the Cache Definition via XML
var count = 0;
var assetfieldidx = -1;

foreach (XmlElement cField in xeCacheFields)
{
    var att = cField.Attributes["name"];
    if (att != null && att.Value == "Col2" )
    {
        assetfieldidx = count;

        var sharedItems = cField.GetElementsByTagName("sharedItems")[0] as XmlElement;
        if(sharedItems == null)
            continue;

        //set the collection attributes
        sharedItems.RemoveAllAttributes();
        att = xdCacheDefinition.CreateAttribute("count");
        att.Value = "3";
        sharedItems.Attributes.Append(att);

        //create and add the item
        var item = xdCacheDefinition.CreateElement("s", sharedItems.NamespaceURI);
        att = xdCacheDefinition.CreateAttribute("v");
        att.Value = "Group A";
        item.Attributes.Append(att);
        sharedItems.AppendChild(item);

        item = xdCacheDefinition.CreateElement("s", sharedItems.NamespaceURI);
        att = xdCacheDefinition.CreateAttribute("v");
        att.Value = "Group B";
        item.Attributes.Append(att);
        sharedItems.AppendChild(item);

        item = xdCacheDefinition.CreateElement("s", sharedItems.NamespaceURI);
        att = xdCacheDefinition.CreateAttribute("v");
        att.Value = "Group C";
        item.Attributes.Append(att);
        sharedItems.AppendChild(item);

        break;
    }

    count++;
}

//Now go back to the main pivot table xml and add the cross references to complete filtering
var xdPivotTable = pivotTable.PivotTableXml;
var xdPivotFields = xdPivotTable.FirstChild["pivotFields"];
if (xdPivotFields == null)
    return;

count = 0;
foreach (XmlElement pField in xdPivotFields)
{
    //Find the asset type field
    if (count == assetfieldidx)
    {
        var att = xdPivotTable.CreateAttribute("multipleItemSelectionAllowed");
        att.Value = "1";
        pField.Attributes.Append(att);

        var items = pField.GetElementsByTagName("items")[0] as XmlElement;
        items.RemoveAll();

        att = xdPivotTable.CreateAttribute("count");
        att.Value = "4";
        items.Attributes.Append(att);
        pField.AppendChild(items);

        //Add the classes to the fields item collection
        for (var i = 0; i < 3; i++)
        {
            var item = xdPivotTable.CreateElement("item", items.NamespaceURI);
            att = xdPivotTable.CreateAttribute("x");
            att.Value = i.ToString(CultureInfo.InvariantCulture);
            item.Attributes.Append(att);

            //Turn of the Cash class in the fielder
            if (i == 1)
            {
                att = xdPivotTable.CreateAttribute("h");
                att.Value = "1";
                item.Attributes.Append(att);
            }

            items.AppendChild(item);

        }

        //Add the default
        var defaultitem = xdPivotTable.CreateElement("item", items.NamespaceURI);
        att = xdPivotTable.CreateAttribute("t");
        att.Value = "default";
        defaultitem.Attributes.Append(att);
        items.AppendChild(defaultitem);

        break;
    }
    count++;
}

pck.Save();

---

很抱歉所有的编辑，但是当我偶然发现这个问题时，我一直在研究这个问题。我创建了一个仅用于应用过滤器的扩展方法。给它提供字段名称（它假定有一个标题行符合列名称），要应用的过滤器，以及包含数据的工作表，如果没有传入数据工作表，它将只是数据透视表工作表。它有完成基本测试所以你应该QA：

public static bool FilterField(this ExcelPivotTable pivotTable, string pageFieldName, IEnumerable<object> filters, ExcelWorksheet dataWorksheet = null)
{
    //set the worksheet
    var ws = dataWorksheet ?? pivotTable.WorkSheet;

    //Set the cache definitions and cache fields
    var xdCacheDefinition = pivotTable.CacheDefinition.CacheDefinitionXml;
    var xeCacheFields = xdCacheDefinition.FirstChild["cacheFields"];
    if (xeCacheFields == null)
        return false;

    //Go the field list in the definitions, note the field idx and valuesfor 
    var count = 0;
    var fieldIndex = -1;
    List<object> fieldValues = null;

    foreach (XmlElement cField in xeCacheFields)
    {
        var att = cField.Attributes["name"];
        if (att != null && att.Value.Equals(pageFieldName, StringComparison.OrdinalIgnoreCase))
        {
            //store the field data
            fieldIndex = count;
            var dataddress = new ExcelAddress(pivotTable.CacheDefinition.SourceRange.Address);

            var valueHeader = ws
                .Cells[dataddress.Start.Row, dataddress.Start.Column, dataddress.Start.Row, dataddress.End.Column]
                .FirstOrDefault(cell => cell.Value.ToString().Equals(pageFieldName, StringComparison.OrdinalIgnoreCase));

            if (valueHeader == null)
                return false;

            //Get the range minus the header row
            var valueObject = valueHeader.Offset(1, 0, dataddress.End.Row - dataddress.Start.Row, 1).Value;
            var values = (object[,])valueObject;

            fieldValues = values
                .Cast<object>()
                .Distinct()
                .ToList();

            //kick back if the types are mixed
            if (fieldValues.FirstOrDefault(v => v is string) != null && fieldValues.FirstOrDefault(v => !(v is string)) != null)
                throw new NotImplementedException("Filter function does not (yet) support mixed parameter types");

            //fill in the shared items for the field
            var sharedItems = cField.GetElementsByTagName("sharedItems")[0] as XmlElement;
            if (sharedItems == null)
                continue;

            //Reset the collection attributes
            sharedItems.RemoveAllAttributes();

            //Handle numerics - assume all or nothing
            var isNumeric = fieldValues.FirstOrDefault(v => v is string) == null;
            if (isNumeric)
            {
                att = xdCacheDefinition.CreateAttribute("containsSemiMixedTypes");
                att.Value = "0";
                sharedItems.Attributes.Append(att);

                att = xdCacheDefinition.CreateAttribute("containsString");
                att.Value = "0";
                sharedItems.Attributes.Append(att);

                att = xdCacheDefinition.CreateAttribute("containsNumber");
                att.Value = "1";
                sharedItems.Attributes.Append(att);

                att = xdCacheDefinition.CreateAttribute("containsInteger");
                att.Value = fieldValues.Any(v => !(v is int || v is long)) ? "0" : "1";
                sharedItems.Attributes.Append(att);
            }

            //add the count
            att = xdCacheDefinition.CreateAttribute("count");
            att.Value = fieldValues.Count.ToString(CultureInfo.InvariantCulture);
            sharedItems.Attributes.Append(att);

            //create and add the item
            foreach (var fieldvalue in fieldValues)
            {
                var item = xdCacheDefinition.CreateElement(isNumeric ? "n" : "s", sharedItems.NamespaceURI);
                att = xdCacheDefinition.CreateAttribute("v");
                att.Value = fieldvalue.ToString();
                item.Attributes.Append(att);
                sharedItems.AppendChild(item);
            }

            break;
        }

        count++;
    }

    if (fieldIndex == -1 || fieldValues == null)
        return false;

    //Now go back to the main pivot table xml and add the cross references to complete filtering
    var xdPivotTable = pivotTable.PivotTableXml;
    var xdPivotFields = xdPivotTable.FirstChild["pivotFields"];
    if (xdPivotFields == null)
        return false;

    var filtervalues = filters.ToList();
    count = 0;
    foreach (XmlElement pField in xdPivotFields)
    {
        //Find the asset type field
        if (count == fieldIndex)
        {
            var att = xdPivotTable.CreateAttribute("multipleItemSelectionAllowed");
            att.Value = "1";
            pField.Attributes.Append(att);

            var items = pField.GetElementsByTagName("items")[0] as XmlElement;
            if (items == null)
                return false;

            items.RemoveAll();

            att = xdPivotTable.CreateAttribute("count");
            att.Value = (fieldValues.Count + 1).ToString(CultureInfo.InvariantCulture);
            items.Attributes.Append(att);
            pField.AppendChild(items);

            //Add the classes to the fields item collection
            for (var i = 0; i < fieldValues.Count; i++)
            {
                var item = xdPivotTable.CreateElement("item", items.NamespaceURI);
                att = xdPivotTable.CreateAttribute("x");
                att.Value = i.ToString(CultureInfo.InvariantCulture);
                item.Attributes.Append(att);

                if (filtervalues.Contains(fieldValues[i]))
                {
                    att = xdPivotTable.CreateAttribute("h");
                    att.Value = "1";
                    item.Attributes.Append(att);
                }

                items.AppendChild(item);
            }

            //Add the default
            var defaultitem = xdPivotTable.CreateElement("item", items.NamespaceURI);
            att = xdPivotTable.CreateAttribute("t");
            att.Value = "default";
            defaultitem.Attributes.Append(att);
            items.AppendChild(defaultitem);

            break;
        }
        count++;
    }

    return true;

}

要在上面的示例中使用它，您可以执行以下操作：

pivotTable.FilterField("Col2", new List<string> { "Group B" });