Creating c# object at runtime with dynamic fields and attributes

Question

I'm using an ORM sytem (sqlite-net) for my android application. I want to be able to create my DB mapping classes dynamically, and be able to add attributes to members, is this possible? I would need to create something like this dynamically:

class ConfigData
{
    [PrimaryKey, AutoIncrement]
    public int id { get; set; }
    [MaxLength(20)]
    public string ip { get; set; }
    [MaxLength(128)]
    public string port { get; set; }
}

Thanks in advance.

See stackoverflow.com/questions/646258/… and stackoverflow.com/questions/6166236/add-properties-at-runtime and stackoverflow.com/questions/1653046/… - it's already pretty well covered on StackOverdlow — dash
– dash, Commented Jun 11, 2012 at 9:20
It really depends what is going to be consuming the object. Different APIs support different models. Sometimes you just have reflection; sometimes you have ComponentModel; sometimes you might be able to use dynamic. Really really depends on who is going to be consuming it. The "reflection only" is the "works most places" option, but requires things like TypeBuilder. Also, though: what is the problem defining ConfigData at compile time? — Marc Gravell
– Marc Gravell, Commented Jun 11, 2012 at 9:25
The problem here, is that I'm trying to create a little version converter between different table structures. For example I would like to know how the field ip in ConfigData version 10 was named in version 5 (Because I need to export to previous version). I need this to provide data from a table version to another below. This is why I wanted to define ConfigData dynamically depending on the version I want to get. Anyway I'm considering now using class/member attributes and see if I can accomplish this in an easier way. — Notbad
– Notbad, Commented Jun 11, 2012 at 10:00

Josh Lee · Accepted Answer · 2013-08-17 21:34:54Z

1

Maybe the Reflection namespace is what you might use, here's an example: http://mironabramson.com/blog/post/2008/06/Create-you-own-new-Type-and-use-it-on-run-time-(C).aspx

edited Aug 17, 2013 at 21:34

Josh Lee

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answered Jun 11, 2012 at 9:17

Ivan Golović

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1 Comment

Notbad Over a year ago

This could be a good option. Do you know how to add attributes to the member vars?

Fedor Hajdu · Accepted Answer · 2012-06-11 09:07:11Z

0

It is possible in C# 4.0 using dynamic types.

answered Jun 11, 2012 at 9:07

Fedor Hajdu

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3 Comments

Ivan Golović Over a year ago

Isn't it possible using Reflection and TypeBuilder class?

Notbad Over a year ago

A little more information would be really welcomed. What about the ExpandoObject?.

Marc Gravell Over a year ago

@Notbad indeed, ExpandoObject is a handy and common implementation of dynamic

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