Partial Constructors and Events in C# 14 — Structuring Your Code Like a Pro

Partial Constructors and Events in C# 14 — Structuring Your Code Like a Pro C# 14 pushes partial type support further by allowing constructors and events to be declared as partial members. This change empowers modularity and source generator scenarios, enabling more powerful abstractions in complex systems and large codebases. In this post, you’ll learn: What new partial members are allowed in C# 14 How to define partial constructors and events How to use partial types with primary constructors Best practices and caveats to avoid runtime surprises What’s New in C# 14? Previously, partial members were limited to methods, properties, and indexers. C# 14 adds: Partial constructors Partial events These new members allow for separation of responsibilities across files or teams — great for large projects, generated code, or layered architectures. Partial Constructors You can now split a class constructor across multiple files. Syntax: Defining Declaration: public partial class User { public partial User(string name); } Implementing Declaration: public partial class User { public partial User(string name) { Name = name ?? throw new ArgumentNullException(nameof(name)); } public string Name { get; } }

May 7, 2025 - 01:36

Partial Constructors and Events in C# 14 — Structuring Your Code Like a Pro

C# 14 pushes partial type support further by allowing constructors and events to be declared as partial members. This change empowers modularity and source generator scenarios, enabling more powerful abstractions in complex systems and large codebases.

In this post, you’ll learn:

What new partial members are allowed in C# 14
How to define partial constructors and events
How to use partial types with primary constructors
Best practices and caveats to avoid runtime surprises

What’s New in C# 14?

Previously, partial members were limited to methods, properties, and indexers. C# 14 adds:

Partial constructors
Partial events

These new members allow for separation of responsibilities across files or teams — great for large projects, generated code, or layered architectures.

Partial Constructors

You can now split a class constructor across multiple files.

Syntax:

Defining Declaration:

public partial class User
{
    public partial User(string name);
}

Implementing Declaration:

public partial class User
{
    public partial User(string name)
    {
        Name = name ?? throw new ArgumentNullException(nameof(name));
    }

    public string Name { get; }
}