Create OpenXML Table With C# - openxml

Question

I'm having issues making an actual table in my excel file. The file is created and all the data is there, but when I open the file the table definition doesn't exist. I'm using this method to try and turn the data range into a table.
private static Table CreateTable(string tableRange, IEnumerable<string> headers)
{
var table = new Table {
Id = 1,
Name = "Table 1",
DisplayName = "Table 1",
Reference = tableRange,
TotalsRowShown = false,
HeaderRowFormatId = 0
};
table.AddNamespaceDeclaration("x", "http://schemas.openxmlformats.org/spreadsheetml/2006/main");
UInt32Value i = 1;
var columns = new TableColumns();
foreach (var header in headers) {
columns.Append(new TableColumn {
Id = i++,
Name = header
});
}
var style = new TableStyleInfo {
Name = "TableStyleMedium2",
ShowFirstColumn = false,
ShowLastColumn = false,
ShowRowStripes = true,
ShowColumnStripes = false
};
table.Append(new AutoFilter { Reference = tableRange });
table.Append(columns);
table.Append(style);
return table;
}
The tableRange variable is a simple excel range string, like "A1:D27". I'm trying to add it to the worksheet like so:
var tableDefinitionPart = worksheetPart.AddNewPart<TableDefinitionPart>();
tableDefinitionPart.Table = CreateTable(tableRange, headers);
I'm not getting any errors when I open the file.
If I open the file with the XML Productivity tool and click on the "x:table (Table)" part within the worksheet I see this:
<x:table xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" id="1" name="Table 1" displayName="Table 1" ref="A1:Z2" totalsRowShown="0" headerRowDxfId="0">
<x:autoFilter ref="A1:Z2" />
<x:tableColumns>
<x:tableColumn id="1" name="Lab Name" />
....
<x:tableColumn id="26" name="Description" />
</x:tableColumns>
<x:tableStyleInfo name="TableStyleMedium2" showFirstColumn="0" showLastColumn="0" showRowStripes="1" showColumnStripes="0" />
</x:table>
So it seems like I'm putting something properly into the file. It's just not an actual "table" as far as Excel is concerned.