Complete In-Depth Custom Attributes and ORM Framework Analysis

Overview

This code demonstrates a sophisticated custom attributes system that mimics Object-Relational Mapping (ORM) frameworks like Entity Framework or Hibernate. It shows how to create custom attributes, apply them to classes and properties, and use reflection to generate SQL DDL (Data Definition Language) statements automatically.

Architecture Overview

The solution consists of three interconnected projects:

1. _16ApnaAttributes: Custom attribute definitions
2. _17DemoPOCOLib: POCO (Plain Old CLR Objects) classes with attributes
3. _18DemoApnaORMLikeHibernate: Reflection-based SQL generation engine

Part 1: Custom Attribute Definitions (_16ApnaAttributes)

Understanding .NET Attributes

What are Attributes?

• Metadata that can be attached to classes, methods, properties, etc.
• Provide declarative information about program elements
• Stored in assembly metadata and accessible via reflection
• Do not affect program execution directly

Base Class Relationship:

// All custom attributes must inherit from System.Attribute
public class MyCustomAttribute : Attribute { }

Table Attribute Implementation