Question

I have a Dictionary of CParam with Register as the Key,

CParam has one field that is read from external text file and Description is used as a key to read in HumanDesc.

Text file is a translation file and Description has to be a string.
Something Like this

PLACE_HOLDER1 "First Place where things are put"
PLACE_HOLDER2 "Secod Place where things are put"
.....

I can easily do this by inserting Register as and putting it in quotes. But There is a 100’s of register and it would be tedious(and not very elegant).
Is there a way that constructor could handle that for me.

Below is a very simplified example of what I ma trying to do:

using System;
using System.Collections.Generic;
namespace Var2String
{
    public class CParam
    {
    public ushort Register;
    public string Description;
    public ushort Content;
    public string HumanDesc;
    public CParam(ushort t_Register, string t_Description, string t_HumanDesc, ushort DefaultVal)
    {
        Register = t_Register;
        Description = t_Description;
        Content = DefaultVal;
        HumanDesc = t_HumanDesc;
    }
};

static class Device1
{
    public const ushort PLACE_HOLDER1 = 0x0123;
    public const ushort PLACE_HOLDER2 = 0x0125;
    public const ushort PLACE_HOLDER_SAME_AS_1 = 0x0123;
    public static Dictionary<ushort, CParam> Registers;
    static Device1()
    {
        Registers = new Dictionary<ushort, CParam>()
     {
       {PLACE_HOLDER1, new CParam(PLACE_HOLDER1,"PLACE_HOLDER1","Place One Holder",100)},
       {PLACE_HOLDER2, new CParam(PLACE_HOLDER1,"PLACE_HOLDER2","Place Two Holder",200)}
     };
        /*
         * Like to be able to do this
         * And constructor CParam
          Registers = new Dictionary<ushort, CParam>()
     {
       {PLACE_HOLDER1, new CParam(PLACE_HOLDER1,"Place One Holder",100)},
       {PLACE_HOLDER2, new CParam(PLACE_HOLDER1,"Place Two Holder",200)}
     };
        */
    }

}
class Program
{
    static private string LookUpTranslationFor(string Key)
    {
        string Translated = "Could not find Val for " + Key;
        //This would read XML file use Key to get translation
        return Translated;
    }
    static void Main(string[] args)
    {
        Console.WriteLine(Device1.Registers[Device1.PLACE_HOLDER1].HumanDesc);
        Console.WriteLine(Device1.Registers[Device1.PLACE_HOLDER2].HumanDesc);
        Device1.Registers[Device1.PLACE_HOLDER2].HumanDesc = LookUpTranslationFor(Device1.Registers[Device1.PLACE_HOLDER2].Description);
        Console.WriteLine(Device1.Registers[Device1.PLACE_HOLDER2].HumanDesc);
        Console.ReadKey(true);
    }
}

}

Answer 1

I’m not sure what i understand you right, but if you register variables is not const you can do something like this:

1.Add another constructor to CParam

public class CParam
{
    ....

    public CParam(Expression<Func<ushort>> ex, string t_HumanDesc, ushort DefaultVal)
    {
        Content = DefaultVal;
        HumanDesc = t_HumanDesc;
        Description = ((MemberExpression) ex.Body).Member.Name;
        Register = ex.Compile().Invoke();
    }
};

2.Chage your device class like this:

internal static class Device1
{
    public static ushort PLACE_HOLDER1 = 0x0123;
    public static ushort PLACE_HOLDER2 = 0x0125;
    public static ushort PLACE_HOLDER_SAME_AS_1 = 0x0123;
    public static Dictionary<ushort, CParam> Registers;

    static Device1()
    {
        Registers = new Dictionary<ushort, CParam>()
                        {
                            {PLACE_HOLDER1, new CParam(() => PLACE_HOLDER1, "Place One Holder", 100)},
                            {PLACE_HOLDER2, new CParam(() => PLACE_HOLDER1, "Place Two Holder", 200)}
                        };
    }
}

Note what this would not work with const variables!