Partial Class, Interface or Struct in C Sharp with example

Explore partial classes, partial interfaces, and partial structs in C#, including practical examples of how and when to use them.

What is a Partial Type?

The partial keyword in C# allows a class, struct, or interface definition to be split across multiple files. At compile time, the compiler combines all the parts into a single type.

Why Use Partial Classes?

Partial classes are especially useful in scenarios involving auto-generated code, such as designer files in Windows Forms or Entity Framework models, allowing generated code and hand-written code to stay separate.

Partial Interfaces and Structs

Just like classes, interfaces and structs can also be declared as partial, which is helpful in large codebases where a single type's definition benefits from being organized across multiple logical files.

Best Practices

While powerful, partial types should be used sparingly in application code and reserved mainly for scenarios involving code generation, to avoid making the codebase harder to navigate.