Using partial class

Microsoft introduced partial class in c# 2.0. This technique is very useful to use custom tool like Mdf Custom Class Generator.

Mdf Custom Class Generator write, in this example, Tank.Mdf.cs. In this way you can add your partial class to manage some custom business rule.

In this example we add a new method: RefreshFromPLC()

1#region Using

2

3using System;

4using System.Collections.Generic;

5using System.Text;

6using EmPy.S7;

7

8#endregion

9

10namespace Mdf.BusinessEntities.Equipment

11{

12    public partial class Tank

13    {

14        #region Custom methods

15

16        public void RefreshFromPLC()

17        {

18            if (PlcReader != null)

19            {

20                Volume = (decimal)PlcReader.ReadFloat(DB, DW);

21                if (Volume > Threshold)

22                {

23                    throw new Exception("Volume over threshold!");

24                }

25            }

26            else

27            {

28                throw new Exception("Plc reader not setted!");

29            }

30        }

31

32        #endregion

33

34        #region Custom properties

35

36        public PlcReader PlcReader;

37

38        // In this sample DB and DW (PLC data addresses) are cusom properties in

39        // partial class. You can add this data as Equipment properties and store them

40        // in SQL Server

41        public byte DB;

42        public ushort DW;

43

44        // In this sample Threshold is a cusom properties in partial class

45        // You can add this data as Equipment properties and store it in SQL Server

46        public decimal Threshold;

47

48        #endregion

49    }

50}

As you can see, in this example we added:

• Some custom properties
• Some custom methods

In the partial class we can access all properties and methods of the CCG generated class (i.e. Volume property).

Mdf - Mes development framework

Mdf - MES Development Framework has been defined from experienced developers to respond to both customers and developers needs.

Write complex Manufacturing Execution Systems fully ISA-95 compliant will never be easier using c# or VB.NET with LINQ to Entity technology, SQL Server 2005/2008 as storage layer, ASP.NET 3.5 with extensive use of Ajax and ASP.NET MVC for user interface, OPC to communicate with PLCs and field devices and Windows Workflow Foundation for plant business rules.

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