How Can I Determine if a C# Type is a Nullable Reference Type Using Reflection?

Exploring C# Nullable Reference Type Detection via Reflection

C# 8.0's introduction of nullable reference types created a need for methods to identify these types using reflection. This article details several techniques to achieve this.

Leveraging NullabilityInfoContext (NET 6 and later)

.NET 6 and subsequent versions offer the NullabilityInfoContext API, designed specifically for handling nullable reference type information. This is the preferred method for directly accessing nullability details, particularly for properties. (See the linked question for detailed examples.)

Attribute-Based Inspection (Pre-.NET 6)

Before .NET 6, determining nullability relied on inspecting custom attributes. The IsNullable helper function (as shown in the linked question) facilitates this by analyzing the property's type, declaring type, and custom attributes. The presence of the [Nullable] attribute determines nullability.

Summary

Regardless of whether you utilize the modern NullabilityInfoContext API (for .NET 6 and later) or the attribute-based method for older versions, reflection provides reliable mechanisms for detecting the nullability of reference types in C#. This knowledge empowers developers to write more informed and robust code.

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