Object Initializers or Constructors in C#: When Should You Use Which?

C# Object Initializers and Constructors: Selection Guide

When dealing with objects in C#, you often encounter two methods of object creation: object initializers and constructors. This article explores the differences between these two methods and provides guidance on how to use them correctly.

Object initializer

Object initializers were introduced in C# 3 to simplify object construction when using object syntax. They allow an object's properties or fields to be set after the object is created but before other methods can access it.

For example:

MyObject myObjectInstance = new MyObject(param1, param2)
{
    MyProperty = someUsefulValue
};

Constructor

The constructor is run when the object is created and is used to initialize the state of the object. They can accept parameters to customize the object's initial settings.

For example:

MyObject myObjectInstance = new MyObject(param1, param2);

Difference

• Initialization timing: Object initializer initializes properties after object creation, while constructor initializes properties during object creation.
• Parameter usage: The constructor usually takes necessary parameters for object initialization, while the object initializer is used for optional or additional property settings.
• Readability: Object initializers can improve code readability, especially when setting multiple properties.
• Thread Safety: Object initializers provide better thread safety by ensuring atomic object initialization.

Applicable scenarios

• Object initializers: Use object initializers when additional properties need to be set after the object is created (e.g. appearance options, non-critical settings).
• Constructor: Use the constructor to initialize key properties required for the object to function properly.
• C# and .NET Features: Object initializers are specific to the C# language and .NET Framework.

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