Retrieve User or Group from an SPFieldUser

In this blog you will learn Retrieve User or Group from an SPFieldUser.

Hello,

Recently I have create a timer job to alert users to have task on a SharePoint list.

On my list I have on column "Assigned To" and it can contains user or group.

This code test field value to determine if it an "SPUser" or "SPGroup" object and retrieve all assigned users :

//Group or User are allowed
SPFieldUser userField = (SPFieldUser)item.Fields.GetField("AssignedTo");
SPFieldUserValue userFieldValue = (SPFieldUserValue)userField.GetFieldValue(item["AssignedTo"].ToString());

var users = new List<SPUser>();
//Tries to get SPUser
if (userFieldValue.User != null)
{
    users.Add(userFieldValue.User);
}
else
{
    //if the field contain group
    SPGroup group = web.SiteGroups.GetByID(userFieldValue.LookupId);
    foreach (SPUser user in group.Users)
    {
        users.Add(user);
    }
}
foreach(var user in users)
{
      //implement your code here
}

If you have any questions you can use comments section ;)