I have a Schengen visa issued from a Swiss Embassy. Can I use it to enter France as my first entry to the Schengen area?
Yes, you can enter France from Switzerland with a Schengen visa. You will have to go through the border crossing process, as you are entering l’espace Schengen. It doesn’t matter from where you come from, as long as everything is in order for entering. Of course, if you arrive from a dangerous country, then the controls will be more strict.
Source : Contrôle à l’arrivée en France (Espace Schengen), and I am French.
Edit: OK, let’s clarify. Switzerland is part of l’espace Schengen, so its visa is indeed valid for all the countries of l’espace Schengen. But this is not a waiver for the other aspects of border crossing. For example, between France and Switzerland you have a strict control of goods, because Switzerland is not a member of the European Union; therefore import/export taxes on goods are in force : VAT on new products, limit on cash, etc.
The same reasoning is valid for entering the European Union from any country; the Schengen Visa is only one aspect of the process for entering the European Union. Some countries can have ban on specific individuals, immigration restrictions (even for tourists), etc. This is specially true in Eastern Europe.
So you have to take into account the whole situation: what is your nationality, from where you come from, via which country you want to enter l’espace Schengen, what is your legal status, etc.
So a Schengen visa can be OK, but you can still be refused entry into a country because of some other aspects related to your nationality. But once your are in, you are in… except if some national justice decides to expel you.
If you want a precise answer, you must ask a more precise question.