How to stop other conditional formatting from disappearing when hackmodding databars into solid fills? - xlsx

Question

EPPlus has no support for extLst thing which is needed to make databars conditional formatting with solid fill. They are gradient by themselves without modifications.
I coded this to modify worksheet's xml directly (this gets databars from worksheet XML and then adds required extLst nodes):
public static Random Rnd = new Random();
public static string GenerateXlsId()
{
//{29BD882A-B741-482B-9067-72CC5D939236}
string id = string.Empty;
for (int i = 0; i < 32; i++)
if (Rnd.NextDouble() < 0.5)
id += Rnd.Next(0, 10);
else
id += (char)Rnd.Next(65, 91);
id = id.Insert(8, "-");
id = id.Insert(13, "-");
id = id.Insert(18, "-");
id = id.Insert(23, "-");
return id;
}
public static void FixDatabarsAtWorksheet(OfficeOpenXml.ExcelWorksheet eworksheet)
{
System.Xml.XmlNodeList databars = eworksheet.WorksheetXml.GetElementsByTagName("dataBar");
if (databars.Count > 0)
{
string conditional_formattings_str = string.Empty;
for (int i = 0; i < databars.Count; i++)
{
string temp_databar_id = GenerateXlsId();
databars[i].ParentNode.InnerXml += #"<extLst>
<ext uri=""{B025F937-C7B1-47D3-B67F-A62EFF666E3E}"" xmlns:x14=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/main"">
<x14:id>{" + temp_databar_id + #"}</x14:id>
</ext>
</extLst>";
//--
string temp_sqref = databars[i].ParentNode.ParentNode.Attributes["sqref"].Value;
string left_type = string.Empty;
string left_val = string.Empty;
string right_type = string.Empty;
string right_val = string.Empty;
string color = string.Empty;
Color databar_fill_color = Color.Empty;
Color databar_border_color = Color.Empty;
for (int j = 0; j < databars[i].ChildNodes.Count; j++)
if (databars[i].ChildNodes[j].LocalName == "cfvo" && databars[i].ChildNodes[j].Attributes["type"] != null)
{
if (string.IsNullOrEmpty(left_type))
left_type = databars[i].ChildNodes[j].Attributes["type"].Value;
else if (string.IsNullOrEmpty(right_type))
right_type = databars[i].ChildNodes[j].Attributes["type"].Value;
if (databars[i].ChildNodes[j].Attributes["val"] != null)
if (string.IsNullOrEmpty(left_val))
left_val = databars[i].ChildNodes[j].Attributes["val"].Value;
else if (string.IsNullOrEmpty(right_val))
right_val = databars[i].ChildNodes[j].Attributes["val"].Value;
}
else if (databars[i].ChildNodes[j].LocalName == "color")
{
color = databars[i].ChildNodes[j].Attributes["rgb"].Value;
int argb = Int32.Parse(color, System.Globalization.NumberStyles.HexNumber);
databar_fill_color = Color.FromArgb(argb);
databar_border_color = Color.FromArgb(255,
databar_fill_color.R - 50 < 0 ? databar_fill_color.R + 50 : databar_fill_color.R - 50,
databar_fill_color.G - 50 < 0 ? databar_fill_color.R + 50 : databar_fill_color.G - 50,
databar_fill_color.B - 50 < 0 ? databar_fill_color.R + 50 : databar_fill_color.B - 50);
}
string temp_conditional_formatting_template = #"<x14:conditionalFormatting xmlns:xm=""http://schemas.microsoft.com/office/excel/2006/main"">
<x14:cfRule type=""dataBar"" id=""{" + temp_databar_id + #"}"">
<x14:dataBar minLength=""" + (string.IsNullOrEmpty(left_val) ? "0" : left_val) + "\" maxLength=\"" + (string.IsNullOrEmpty(right_val) ? "100" : right_val) + "\" gradient=\"0\" " + (databar_border_color.IsEmpty ? string.Empty : "border = \"1\"") + ">";
temp_conditional_formatting_template += Environment.NewLine + "<x14:cfvo type=\"" + (left_type.ToLower() == "min" ? "autoMin" : left_type) + "\" />";
temp_conditional_formatting_template += Environment.NewLine + "<x14:cfvo type=\"" + (right_type.ToLower() == "max" ? "autoMax" : right_type) + "\" />";
if (!databar_border_color.IsEmpty)
temp_conditional_formatting_template += Environment.NewLine + "<x14:borderColor rgb=\"" + BitConverter.ToString(new byte[] { databar_border_color.A, databar_border_color.R, databar_border_color.G, databar_border_color.B }).Replace("-", "") + "\" />";
temp_conditional_formatting_template += Environment.NewLine + #"</x14:dataBar>
</x14:cfRule>
<xm:sqref>" + temp_sqref + #"</xm:sqref>
</x14:conditionalFormatting>";
conditional_formattings_str += temp_conditional_formatting_template;
}
databars[0].ParentNode.ParentNode.ParentNode.InnerXml += #"<extLst>
<ext uri=""{78C0D931-6437-407d-A8EE-F0AAD7539E65}"" xmlns:x14=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/main"">
<x14:conditionalFormattings>" + conditional_formattings_str + #"
</x14:conditionalFormattings>
</ext>
</extLst>";
}
}
And this really makes databars solid fill, the problem is any other conditional formatting like GreaterThan loses it's style when true.
For example I add databar and GreaterThan 123 (green) conditional formattings.
Excel still see coditional formatting rule GreaterThan 123, but the style is not set when it's true (green is not set). While databars is displayed correctly at same time.
I don't know where to look... Someone help!

Answer 1

Thats the problem with hacks - they are so fragile! :)
I was able to get it work with another hack - setting the style differential formatting (dxf) reference which seems to be dropped when epplus saves. What might be happening is epplus only thinks there is one dxf on save so it doesnt set the value since excel will assume it is the first dxf style (index 0) but that is a bit of a guess.
Anyway, if you set the dxfid via XML manually it will find it. But order counts here, you have to apply the databar hack last otherwise it will hit the wrong reference:
[TestMethod]
public void FixDatabarsAtWorksheetTest()
{
//https://stackoverflow.com/questions/58417819/how-to-stop-other-conditional-formatting-from-disappearing-when-hackmodding-data
//Throw in some data
var datatable = new DataTable("tblData");
datatable.Columns.AddRange(new[]
{
new DataColumn("Col1", typeof(int)), new DataColumn("Col2", typeof(int)), new DataColumn("Col3", typeof(object))
});
for (var i = 0; i < 10; i++)
{
var row = datatable.NewRow();
row[0] = i;
row[1] = i * 10;
row[2] = Path.GetRandomFileName();
datatable.Rows.Add(row);
}
//Create a test file
var fi = new FileInfo(#"c:\temp\FixDatabarsAtWorksheetTest.xlsx");
if (fi.Exists)
fi.Delete();
using (var pck = new ExcelPackage(fi))
{
var workbook = pck.Workbook;
var doc = workbook.Worksheets.Add("Sheet1");
doc.Cells.LoadFromDataTable(datatable, true);
//Set the greater than
var gtConditional = doc
.ConditionalFormatting
.AddGreaterThan(doc.Cells["A2:A11"]);
gtConditional.Formula = "2";
gtConditional.Style.Fill.BackgroundColor.Color = Color.GreenYellow;
//Fix the gt
var xdoc = doc.WorksheetXml;
var nsm = new XmlNamespaceManager(xdoc.NameTable);
nsm.AddNamespace("default", xdoc.DocumentElement.NamespaceURI);
var gtNode = xdoc.SelectSingleNode("/default:worksheet/default:conditionalFormatting[#sqref=\"A2:A11\"]", nsm);
//Create the new attribute for table
var att = xdoc.CreateAttribute("dxfId");
att.Value = "0";
gtNode
.FirstChild
.Attributes.Append(att);
//Set the bar condition LAST
var barConditional = doc
.ConditionalFormatting
.AddDatabar(doc.Cells["B2:B11"], Color.FromArgb(99, 195, 132));
barConditional.HighValue.Type = eExcelConditionalFormattingValueObjectType.Num;
barConditional.LowValue.Type = eExcelConditionalFormattingValueObjectType.Num;
barConditional.HighValue.Value = 82;
barConditional.LowValue.Value = 0;
FixDatabarsAtWorksheet(doc);
pck.Save();
}
}
I get this:
Not sure how feasible this is for you depending on how many conditional formats you have but its worth a shot.