Adding versioning to the Entity class

Question

I have an old code base with 2 Entity classes (suppose with 10 measure). Old Functionality work like whenever u upload a Excel file it gonna parse the file and map to these entity class. Now as per new requirements Every year I am getting more measure added to these entity classes and getting new Excel file with 5 measure. How can I add versioning based on every year or how can I do mapping to the entity class every year from only one base Entity Class. Or how can I introduce this functionality without changing the design

Example of entity class-

[DataColumnAttribute]
public StatusLkup Insurance { get; set; }

[DataColumnAttribute]
public Code Status { get; set; }

[DataColumnAttribute]
public string test1 { get; set; }

Example of Excel file

Row 1 - Insurance, states, test1 Row 2 - 5, Co, test

Next year suppose 2 more new measure added to an entity class

[DataColumnAttribute]
public StatusLkup Insurance { get; set; }

[DataColumnAttribute]
public Code Status { get; set; }

[DataColumnAttribute]
public string test1 { get; set; }  

[DataColumnAttribute]
public string test2 { get; set; }  

[DataColumnAttribute]
public string test3 { get; set; }

Next year excel file

Row 1 - test1, test2 Row 2 - 12, 11

you can have a single model with all fields from all versions and use only those fileds which are related to the version of the exact object (version can be stored separately). so when a new version comes, you would need just to extend your existing model, and add a logic which processes it. — Yehor Androsov
– Yehor Androsov, Commented Feb 12, 2020 at 21:07

ΩmegaMan · Accepted Answer · 2020-02-13 00:22:55Z

Since each year is a different, but based on the previous, one can create Interfaces which will define (version) the years.

One can create interfaces regardless of the differences, but the point being, it versions the data.

By doing that you will version the data and be able to use/sort it accordingly with no changes in current code, just adding new code each year.

Example

Two interfaces and the second one inheirits from the first:

public interface IYear1
{
    int Test1 { get; set;}
}

public interface IYear2 : IYear1
{
    int Test2 { get; set;}
}

Then the classes derived:

public class Year1 : IYear1
{
    public int Test1 { get; set;}
}

public class Year2 : Year1, IYear2
{
    public int Test2 { get; set; }
}

Then in code we can create/determine what year is being processed:

var year = new Year2() { Test1 = 1, Test2 = 2};

if (year is IYear2)
    Console.WriteLine("Year 2 Found");

if (year is IYear1)
    Console.WriteLine("Year 1 Found");

The result is we identified two versions that are being used:

Year 2 Found
Year 1 Found

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