C# Concept - Properties with validation

Overview

Validated properties are a property design pattern, not a standalone C# release feature. They rely on ordinary property accessors and guard clauses.

Introduced In

This pattern has been possible since C# 1.0 (2002).

Example

public class Person
{
  private int _age;

  public int Age
  {
    get => _age;
    set
    {
      if (value < 0 || value > 120)
        throw new ArgumentOutOfRangeException(nameof(value));
      _age = value;
    }
  }
}

Notes

• Constructor validation is often a better choice for immutable models.
• Keep setter validation focused and predictable.