So recently I had to perform some custom code that would add an entry from a people picker control to a user\group column and back again (on another form).  Going from the people picker control to SharePoint is really easy (the code snippet’s below are obviously vb.net.  I am trying to keep most of my examples on this site in C#, but this particular client I wrote this for was a VB shop at the time).


 

Next, cast the value to an SPUser type and update the list. Please note: I realize some of you may be wondering why I am not going directly from the people picker to SPUser.  The reason being is that in most cases you are updating more than one field at a time and I wanted to show you a method (at least the one I use) to store columns of multiple types

 

That may seem like a lot of code just to upload, but remember it was written to handle more than just the one column. It also illustrates a method to upload an entire list row’s worth of data.

Now to go from a User Column to a people picker is quite a bit less code because I am only doing it one column at a time and access the column directly.  I am not building a dictionary to hold different field types nor updating a number of fields at once.  However, I do think that going from a User column to a People Picker is a bit more convoluted.  You actually first cast the user column into a SPUser object, then you put the user object’s login name into a Picker Entity.  You then add the picker entity to an ArrayList and finally you then add the array list to the picker object.

 

So hopefully this illustrates a method that can be used to take a value from a People Picker in a custom form up to SharePoint and then back again.