You need to use separate Run
elements for the differently styled pieces of text. You can add the bold by creating a RunProperties
element and adding a Bold
element to that.
The following code will work on an existing spreadsheet that has no rows (note I haven't added the code for merging as that just adds complication - if you need help with that then please see my answer here)
using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open(filename, true))
{
WorkbookPart workBookPart = spreadsheetDocument.WorkbookPart;
WorkbookPart workbookPart = spreadsheetDocument.WorkbookPart;
WorksheetPart worksheetPart = workbookPart.WorksheetParts.First();
SheetData sheetData = worksheetPart.Worksheet.Elements<SheetData>().First();
//create a row
Row row1 = new Row() { RowIndex = 1U };
//create a new inline string cell
Cell cell = new Cell() { CellReference = "A1" };
cell.DataType = CellValues.InlineString;
//create a run for the bold text
Run run1 = new Run();
run1.Append(new Text("ABC"));
//create runproperties and append a "Bold" to them
RunProperties run1Properties = new RunProperties();
run1Properties.Append(new Bold());
//set the first runs RunProperties to the RunProperties containing the bold
run1.RunProperties = run1Properties;
//create a second run for the non-bod text
Run run2 = new Run();
run2.Append(new Text(Environment.NewLine + "XYZ") { Space = SpaceProcessingModeValues.Preserve });
//create a new inline string and append both runs
InlineString inlineString = new InlineString();
inlineString.Append(run1);
inlineString.Append(run2);
//append the inlineString to the cell.
cell.Append(inlineString);
//append the cell to the row
row1.Append(cell);
sheetData.Append(row1);
}
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