Nullable warnings

Context: When nullable annotations are enabled, the compiler produces warnings for potentially unsafe null operations.

Common warnings

• CS8618: Non‑nullable property uninitialized
• CS8600: Converting null literal to non‑nullable type
• CS8602: Dereference of a possibly null reference
• CS8625: Cannot convert null literal to non‑nullable type

Fixing warnings

public class Person
{
    public string Name { get; set; } // CS8618
}
// Fix: initialize
public class Person
{
    public string Name { get; set; } = "";
}

Using nullable checks

string? name = GetName();
if (name != null)
{
    int length = name.Length; // no warning
}
// Or using null‑conditional operator
int? length = name?.Length;

Real-world usage example

Team coding standards: Enforce nullable warnings as errors in CI/CD to prevent null reference exceptions in production.

Example: In a GitHub Actions workflow, add -p:WarningsAsErrors=nullable to dotnet build.

Related sections

• 6.4 Nullable reference types
• 6.4.2 Nullable annotation context