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Diagram contrasting explicit Dispose calls with garbage collector finalization timing in C#.

C# Dispose vs Destructor: Key Differences Explained

Illustration of C# variable declaration showing type, name, and value assignment in a code editor.

C# Variable Declaration: Syntax and Practical Usage

Diagram illustrating C# primary constructor class syntax with parameters and class body.

C# Primary Constructors for Classes: Syntax and Usage

Illustration of sorting elements using a custom IComparer in C#

C# IComparer: Custom Sorting with IComparer<T>

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Diagram of a C# expression tree representing a lambda expression with nodes for parameters, properties, and comparison.

C# Expression Trees: Building Dynamic Queries

See how to construct, compile, cache, and use C# expression trees for dynamic filters and IQueryable providers.

expression treesLINQIQueryabledynamic queries

Diagram showing two directional arrows flowing between stacked generic type containers, representing covariance and contravariance in C#.

C# Covariance vs Contravariance: How Generic Variance Works

Understand how C# covariance and contravariance control generic type conversions, including when the compiler permits them and how arrays differ.

C#GenericsVarianceType Safety

Illustration of a C# method signature with generic type parameters and constraints

C# Generic In Parameter: Syntax and Constraints

c# generic in parameter: Learn how to define and use generic type parameters in C# methods, including constraints, multiple parameters, and runtime behavior.

C#GenericsType ParametersMethod Constraints

Diagram showing a C# generic method with an out parameter and the type inference constraint.

C# Generic Out Parameter: Type Inference Explained

Generic methods with out parameters have type-inference constraints at the call site. This article explains why explicit type arguments are often required and compares TryGetValue and tuple alternatives.

C# genericsout parameterstype inferenceTryGetValue pattern

Diagram showing a contravariant generic interface where a general object comparer is assigned to a specific string comparer variable.

C# Contravariance: How the in Keyword Works

Learn how C# contravariance works with delegates and generic interfaces, including the in keyword, practical usage, and common type-safety boundaries.

C# genericsvariancedelegatesgeneric interfaces

Diagram showing assignment of IEnumerable<string> to IEnumerable<object> with a checkmark for safe covariance.

Understanding C# Covariance in Generics and Interfaces

c# covariance: Learn how C# covariance works in arrays, generic interfaces, and delegates, where it is allowed, and how to avoid runtime exceptions.

C# GenericsCovarianceContravarianceType Safety

Illustration of C# generic variance showing covariance and contravariance directions between base and derived types.

C# Generic Variance: Covariance & Contravariance

c# generic variance: Understand C# generic variance: how out and in keywords enable covariance and contravariance in interfaces and delegates, with practical examples.

covariancecontravariancegeneric interfacesdelegates