Variable size of DataForm objects

[Thomas]

Hello everyone,

 I am facing an issue using DataForm. I have an  abstract class IBacktestOption and several inherited classes. Let's take only two of them : OptionCall and CallSpread. These classes share 4 arguments with IBacktestOption and have their own arguments.

Here is the IBacktestOption class :

public abstract class IBacktestOption
   {
       #region fields

       private double mGearing;
       public double Gearing { get { return mGearing; } set { mGearing = value; } }

       private double? mGlobalCap;
       public double? GlobalCap { get { return mGlobalCap; } set { mGlobalCap = value; } }

       private double? mGlobalFloor;
       public double? GlobalFloor { get { return mGlobalFloor; } set { mGlobalFloor = value; } }

       public string Nom { get; set; }


       #endregion

       protected IBacktestOption(double aGearing, double? aGlobalCap, double? aGlobalFloor)
       {
           Gearing = aGearing;
           GlobalCap = aGlobalCap;
           GlobalFloor = aGlobalFloor;
       }

       public abstract Dictionary<DateTime, IResultatsBacktest> GetOptionResults(IBacktesting backtest);

       public abstract bool CheckOption();

   }

This is OptionCall class :

class OptionCall : IBacktestOption, IEditableObject, INotifyPropertyChanged

    {

 

        #region fields

 

        private double mStrike;

        public double Strike { get { return mStrike; } set { mStrike = value; } }

 

        OptionCallData backupOptParamData;

        private int mID;

 

        public struct OptionCallData

        {

            internal int ID;

            internal double Strike;

            internal double? CapGlobal;

            internal double? FloorGlobal;

            internal double Gearing;

        }

 

        public int ID

        {

            get { return mID; }

        }

 

        #endregion Fields

 

        #region constructors

 

        public static OptionCall CreateNewOptionCall(double strike, double gearing = 1, double? cap = null, double? floor = null)

        {

            return new OptionCall(strike,gearing,cap,floor);

        }

 

        public OptionCall(double strike, double gearing = 1, double? cap = null, double? floor = null) : base(gearing,cap,floor)

        {

            Strike = strike;

            Nom = "Call";

        }

 

        #endregion

 

        public override Dictionary<DateTime, IResultatsBacktest> GetOptionResults(IBacktesting backtest)

        {

            /* ... */


        }

 

        public override bool CheckOption()

        {

            return true;

        }

 

        #region Edition

 

        public void BeginEdit()

        {

 

        }

 

        public void CancelEdit()

        {

            mStrike = this.backupOptParamData.Strike;

            GlobalCap = this.backupOptParamData.CapGlobal;

            GlobalFloor = this.backupOptParamData.FloorGlobal;

            Gearing = this.backupOptParamData.Gearing;

        }

 

        public void EndEdit()

        {

            this.backupOptParamData.Strike = mStrike;

            this.backupOptParamData.CapGlobal = GlobalCap;

            this.backupOptParamData.FloorGlobal = GlobalFloor;

            this.backupOptParamData.Gearing = Gearing;

        }

 

 

        #endregion Edition

 

 

        #region Events

 

        public event PropertyChangedEventHandler PropertyChanged;

 

        private void NotifyPropertyChanged(string info)

        {

            if (PropertyChanged != null)

                PropertyChanged(this, new PropertyChangedEventArgs(info));

        }

 

        #endregion Events

 

 

    }

This is CallSpread class :

class CallSpread : IBacktestOption, IEditableObject, INotifyPropertyChanged
   {
       #region fields

       private double mStrike1;
       public double Strike1 { get { return mStrike1; } set { mStrike1 = value; } }

       private double mStrike2;
       public double Strike2 { get { return mStrike2; } set { mStrike2 = value; } }

       OptionCallData backupOptParamData;
       private int mID;

       public struct OptionCallData
       {
           internal int ID;
           internal double Strike1;
           internal double Strike2;
           internal double? CapGlobal;
           internal double? FloorGlobal;
           internal double Gearing;
       }

       public int ID
       {
           get { return mID; }
       }



       #endregion Fields

       #region constructors

       public static CallSpread CreateNewCallSpread(double strike1, double strike2, double gearing = 1, double? cap = null, double? floor = null)
       {
           return new CallSpread(strike1, strike2, gearing, cap, floor);
       }

       public CallSpread(double strike1, double strike2, double gearing = 1, double? cap = null, double? floor = null) : base(gearing,cap,floor)
       {
           Strike1 = Math.Min(strike1, strike2);
           Strike2 = Math.Max(strike1, strike2);
           Nom = "Call Spread";
       }

       #endregion

       public override Dictionary<DateTime, IResultatsBacktest> GetOptionResults(IBacktesting backtest)
       {
          /* ... */
       }

       public override bool CheckOption()
       {
           return true;
       }


       #region Edition

       public void BeginEdit()
       {

       }

       public void CancelEdit()
       {
           mStrike1 = this.backupOptParamData.Strike1;
           mStrike2 = this.backupOptParamData.Strike2;
           GlobalCap = this.backupOptParamData.CapGlobal;
           GlobalFloor = this.backupOptParamData.FloorGlobal;
           Gearing = this.backupOptParamData.Gearing;
       }

       public void EndEdit()
       {
           this.backupOptParamData.Strike1 = mStrike1;
           this.backupOptParamData.Strike2 = mStrike2;
           this.backupOptParamData.CapGlobal = GlobalCap;
           this.backupOptParamData.FloorGlobal = GlobalFloor;
           this.backupOptParamData.Gearing = Gearing;
       }


       #endregion Edition


       #region Events

       public event PropertyChangedEventHandler PropertyChanged;

       private void NotifyPropertyChanged(string info)
       {
           if (PropertyChanged != null)
               PropertyChanged(this, new PropertyChangedEventArgs(info));
       }

       #endregion Events

   }

In my view I have my DataForm declare like this :

<telerik:RadDataForm Grid.Column="1" Margin="12,0,6,21" Grid.ColumnSpan="2" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"  ItemsSource="{Binding BacktestOpt}"
                                         CommandButtonsVisibility="Cancel,Commit,Edit,Navigation" Grid.Row="1" Height="456" Grid.RowSpan="2" />

And in my view model I initialize my Collection (I use a ViList, which is a structure almost equivalent to a simple List) with an element of OptionCall type :

private ViList<IBacktestOption> mBacktestOpt;
       public ViList<IBacktestOption> BacktestOpt
       {
           get
           {
               if (mBacktestOpt == null && Formule == 0)
               {
                   ViList<IBacktestOption> newBacktestOpt = new ViList<IBacktestOption>();
                   newBacktestOpt.Add(Creators.CreateNewOptionCall(0));
                   this.mBacktestOpt = new ViList<IBacktestOption>(newBacktestOpt);
                   Formule = PayoffFormule.CALL;
               }
               return mBacktestOpt;
           }
           set
           {
               mBacktestOpt = value;
               OnPropertyChanged("BacktestOpt");
           }
       }

When I start my application, everything is fine, I have what I want i.e. my DataForm with my 6 fields : "Strike", "ID", "Gearing", "GlobalCap", "GlobalFloor", "Nom".
In my page, I also have a RadComboBox which enables me to choose which formula I want to use. This combobox is binded to this field in my view model :

private PayoffFormule mFormule;
        public PayoffFormule Formule
        {
            get { return mFormule; }
            set
            {
                mFormule = value;
                switch (mFormule)
                {
                    case PayoffFormule.CALL :
                        Backtest.Option = Creators.CreateNewOptionCall(0);
                        break;
                    case PayoffFormule.PUT :
                        Backtest.Option = Creators.CreateNewOptionPut(0);
                        break;
                    case PayoffFormule.ASIAN_CALL:
                        Backtest.Option = Creators.CreateNewAsianCall(0);
                        break;
                    case PayoffFormule.ASIAN_PUT:
                        Backtest.Option = Creators.CreateNewAsianPut(0);
                        break;
                    case PayoffFormule.CALL_SPREAD:
                        Backtest.Option = Creators.CreateNewCallSpread(0,0.15);
                        break;
                    default:
                        break;
                }
                BacktestOpt.Add(Backtest.Option);
                OnPropertyChanged("BacktestOpt");
                OnPropertyChanged("Formule");
            }
        }

When I use the ComboBox to change the formula, a new element is added to the DataForm and here is my issue : this new element only have the fields of IBacktestOption class. And when I use Navigation buttons to go back on my first element (OptionCall), the number of fields of the element have been reduced to 4 ("Gearing", "GlobalCap", "GlobalFloor", "Nom").

I want to know if it is possible to have the fields of the inherited classes instead of the ones of IBacktestOption.


Moreover, in reality I don't need to have a list of IBacktestOption in my DataForm, I only need to have the current option (the one which is selected in the combobox). So, I have tried to empty my List when I change the option type in the combobox :

private PayoffFormule mFormule;
       public PayoffFormule Formule
       {
           get { return mFormule; }
           set
           {
               mFormule = value;
               BacktestOpt.RemoveAt(0);
               switch (mFormule)
               {
                   case PayoffFormule.CALL :
                       Backtest.Option = Creators.CreateNewOptionCall(0);
                       break;
                   case PayoffFormule.PUT :
                       Backtest.Option = Creators.CreateNewOptionPut(0);
                       break;
                   case PayoffFormule.ASIAN_CALL:
                       Backtest.Option = Creators.CreateNewAsianCall(0);
                       break;
                   case PayoffFormule.ASIAN_PUT:
                       Backtest.Option = Creators.CreateNewAsianPut(0);
                       break;
                   case PayoffFormule.CALL_SPREAD:
                       Backtest.Option = Creators.CreateNewCallSpread(0,0.15);
                       break;
                   default:
                       break;
               }
               BacktestOpt.Add(Backtest.Option);
               OnPropertyChanged("BacktestOpt");
               OnPropertyChanged("Formule");
           }
       }

It works, I have the good number of fields for each option type. But, I need to click on the Next Item Navigation Button to reach my element. Indeed, the first one is empty. It is not really handy for a user. So, I also want to know if there is a way to click on this button automatically.

Finally, I have a last request. As, I don't really need a List for my elements, I tried to use a IBacktestOption instead of a ViList<IBacktestOption> in BactestOpt field. But I didn't manage to have fields printed in DataForm, the DataForm was empty...

Thank you very much for your help.
Regards,

Thomas

[Ivan Ivanov]

Hello,

 Would it be possible for you to send us a simple project that illustrates your implementation? I will revise it and then I will send you a updated version back.

Regards,
Ivan Ivanov
Telerik

[Thomas]

Hello,
Thank you for your answer. You will find a simple version of the project here : http://fr.packupload.com/I69N7IFOLBI

Regards,

Thomas

[Ivan Ivanov]

Hello,

 Unfortunately, I did not manage to open the attached archive. It was reported to be corrupted. Does your collection contain homogeneous data, or you have items of both of the inherited types? You can try subscribing to the AddedNewItem event replacing the new item in the arguments.

Regards,
Ivan Ivanov
Telerik

[Thomas]

Hello,

Thank you for your answer. There is a new link to a simple project. I hope you could use this one.
https://www.zeta-uploader.com/673544980

Regards,

Thomas

[Thomas]

Hello,

My problem is resolved. Thank you for your help.

Regards,
Thomas