public static TF AddField <TF>(
this SPFieldCollection fields,
SPFieldType fieldType,
string internalName,
string displayName,
string groupName,
bool required,
Action <TF> action)
where TF : SPField
{
return(fields.AddField <TF>(fieldType, internalName, required,
field =>
{
field.Title = displayName;
if (!string.IsNullOrEmpty(groupName))
{
field.Group = groupName;
}
if (action != null)
{
action(field);
}
}));
}