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Q&A

How to generate lots of hyperlinks rather fast using ClosedXML library?

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I am using ClosedXML library to generate an Excel containing thousands of hyperlinks using cell's Hyperlink property:

cell.SetValue(text).Hyperlink = new XLHyperlink(url);

Such a call takes about 3ms which seems very fast, but this leads to exports taking up to one minute for large exports (10K+ rows). Writing the URL as text in the cell is much faster, but it is not user-friendly (the user has to enter the cell, and press Enter to trigger hyperlink creation).

Is there a method to improve the performance and still get hyperlinks in the exported Excel?

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1 answer

+1
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One faster alternative is to use a formula to create the hyperlink. An example is provided below:

public static IXLCell SetHyperLink(this IXLCell cell, string url, string text = "link")
{
	if (string.IsNullOrWhiteSpace(url))
		return cell;

	// ensure a valid hyperlink text
	string actualText = text?.Replace("\"", "\"\"");
	actualText = !string.IsNullOrWhiteSpace(actualText) ? actualText : "link";
	string actualUrl = url.Trim();

	bool isValidUrl = Uri.IsWellFormedUriString(actualUrl, UriKind.Absolute);
	if (isValidUrl)
	{
		cell.FormulaA1 = $"=HYPERLINK(\"{url}\", \"{actualText}\")";
		cell.Style.Font.Underline = XLFontUnderlineValues.Single;
	}
	else
	{ 
		cell.SetValue(url);
	}

	return cell;
}

Actual hyperlink creation is done via cell.FormulaA1 = $"=HYPERLINK(\"{url}\", \"{actualText}\")";, but the rest of the code is required to check for various conditions that lead to invalid formulas (this creates a nasty popup when opening the Excel file that requires the user to confirm the Excel repairing).

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