How to manage column based access control in Sharepoint lists?

Question

I\'m making issue tracking portal based on Sharepoint. Users should be able to add entries, but in the entry itself I want one column to only be visible to a specific group

Answer 1

As far as I know that is not available in the standard platform. What you can do on the other hand is to handcraft your own fieldcontrol

So in custom fieldtypes.xml

  
    MyInteger
    Integer
    ...
    xxx
  

and in sitecolumns.xml

and in your fieldcontrol

public class MyInteger: SPFieldNumber
{
    public MyInteger(SPFieldCollection fields, string fieldName)
        : base(fields, fieldName)
    {
    }

    public MyInteger(SPFieldCollection fields, string typeName, string displayName)
        : base(fields, typeName, displayName)
    {
    }


    public override BaseFieldControl FieldRenderingControl
    {
        [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
        get
        {
            Microsoft.SharePoint.WebControls.BaseFieldControl ctl = 
               new MyIntegerControl();
            ctl.FieldName = InternalName;
            return ctl;

        }
    }

    }

and in the MyIntegerControl you can do whatever you want (lots of overrides), but an example is:

protected override void CreateChildControls()
{
    base.CreateChildControls();
    if (this.ControlMode == SPControlMode.New || 
        this.ControlMode == SPControlMode.Display)
    {
      // check that use is admin and display value
    }
}