LVControl.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace Seci.LabView.Controls
{
    abstract class LvControl
    {
        protected SerialisableList<int> _clusterIndices;
        
        protected String _name;
        public String Name { get { return _name; } }

        public abstract String GetNameAndType();

        public virtual String[] GetValue(ref strongnameLabview.VirtualInstrument vi)
        {
            String[] result;

            if (_clusterIndices == null)
            {
                String temp = Convert.ToString(vi.GetControlValue(_name));
                String[] temp2 = { temp };
                result = temp2;
            }
            else
            {
                String temp = Convert.ToString(GetValueFromCluster(vi)[_clusterIndices[_clusterIndices.Count - 1]]);
                String[] temp2 = { temp };
                result = temp2;
            }

            return result;
        }

        public abstract String GetControlType();

        public virtual void SetValue(ref strongnameLabview.VirtualInstrument vi, Object value)
        {
            if (_clusterIndices == null)
            {
                vi.SetControlValue(_name, value);
            }
            else
            {
                SetValueInCluster(ref vi, value);
            }
        }

        protected Object[] GetValueFromCluster(strongnameLabview.VirtualInstrument vi)
        {
            //Split the name as we need the name of the first cluster
            String[] splitName = _name.Split(':');

            Object[] vals = (Object[])vi.GetControlValue(splitName[0]);

            //this works for nested clusters!
            for (int i = 0; i < _clusterIndices.Count - 1; ++i)
            {
                vals = (Object[])vals[_clusterIndices[i]];
            }

            return vals;
        }

        protected void SetValueInCluster(ref strongnameLabview.VirtualInstrument vi, Object value)
        {
            //Split the name as we need the name of the first cluster
            String[] splitName = _name.Split(':');

            Object[] vals = (Object[])vi.GetControlValue(splitName[0]);

            //Need to find the value to change                   
            if (_clusterIndices.Count == 1)
            {
                vals[_clusterIndices[0]] = value;
            }
            else if (_clusterIndices.Count == 2)
            {
                ((Object[])vals[_clusterIndices[0]])[_clusterIndices[1]] = value;
            }
            else if (_clusterIndices.Count == 3)
            {
                ((Object[])(((Object[])vals[_clusterIndices[0]])[_clusterIndices[1]]))[_clusterIndices[2]] = value;
            }
            else if (_clusterIndices.Count == 4)
            {
                ((Object[])(((Object[])(((Object[])vals[_clusterIndices[0]])[_clusterIndices[1]]))[_clusterIndices[2]]))[_clusterIndices[3]] = value;
            }
            else
            {
                //It is unlikely that ANYONE would nest 5 levels of clusters but just in case
                //We throw an error up to next level
                throw new ArgumentException("Looking for a nested cluster >4 deep.");
            }

            //Then send all the values.
            //Understandably there is an element of risk attached to sending all the values
            //as variables could be adjusted by other means and then overwriten
            //with the "old" value. This is unlikely though as the read then write is very
            //quick < 1/1000th ms
            vi.SetControlValue(splitName[0], vals);
        }
    }
}