Bits of .NET

Many devs struggle with strongly-typed configuration returning null unexpectedly.

🔥 Main Causes

• Missing services.Configure<T>()

• Wrong section name

• Mistyped property names

• Missing getters/setters

• Nested classes not matching JSON structure

✔ The Correct Pattern

builder.Services.Configure<MySettings>(
    builder.Configuration.GetSection("MySettings"));

public class MySettings
{
    public string ApiKey { get; set; }
}

✔ But Here’s the Hidden Trick

Add validation to avoid silent nulls:

builder.Services.AddOptions<MySettings>()
    .Bind(builder.Configuration.GetSection("MySettings"))
    .ValidateDataAnnotations()
    .ValidateOnStart();

Your app now fails at startup → no mysterious null surprises.