Which C# 14 feature actually changed how you write code day-to-day?
I've been running .NET 10 in a couple of side projects since the LTS drop. When it launched I assumed that the big C# 14 win for me would be extension members. It's nice but the feature that I actually ended up using the most is turned out to be the boring one: the field keyword.
Every time I needed a little validation in a property, I used to write the full backing-field:
Before (C# 13):
private string _name;
public string Name
{
get => _name;
set => _name = value?.Trim()
?? throw new ArgumentNullException(nameof(value));
}
After (C# 14):
public string Name
{
get;
set => field = value?.Trim()
?? throw new ArgumentNullException(nameof(value));
}
No hand-declared _name. Tiny change, but it shows up multiple places, which is exactly why it wins.
The other one which impressed the most is the file-based apps which quietly replaced half of my throwaway scripts:
Before:
mkdir tool && cd tool
dotnet new console
// edit Program.cs + csproj, then:
dotnet run
After:
// tool.cs — no project, no folder
Console.WriteLine("Just run me.");
dotnet run tool.cs
Type-safe code with the full BCL and zero .csproj turned out to be more useful than I expected.
So I'm curious where everyone actually landed:
- Which C# 14 feature earned a permanent spot in your muscle memory, and which turned out to be a demo-only feature?
- Anyone using extension members from C# 14 in real code yet, or still letting it settle?
- And for the folks still on .NET 8 what's holding up the jump to 10?