I recently needed to rescue contact data stored in a .vcf file (vCard) and export it into Excel.
As I did not want to spend much time on this work, I searched and found this C# solution on Code Project which reads VCF 2.1 files.
After a couple of modifications, the program was able to parse VCF 3.0 files, display the contents of the file in a multi-line text control, and copy the contents to the clipboard.
In Excel, the clipboard data can be pasted and the result saved as .xls or .xlsx file.
While the solution now works for my purposes (i.e. reading a VCF file and extracting contacts, phone numbers and address, email addresses, and websites), the code does not parse the full contents of a VCF file, and does not write a VCF file.
The original author was aware of some shortcomings of his solution, and so am I.
If I wrote a parser/writer from scratch, my solution would retrieve the data into dictionaries (1 per contact), and implement accessor properties to retrieve and store the requested data.
Nevertheless, if you want a simply data retrieval tool to copy existing data into an Excel sheet, the solution is good enough.