Partial Classes in C#

A partial class is an ability to separate the implementation of a single class into multiple files and these files are combined to create in a single class when the code is compiled. Partial classes are created by using the keyword partial.

public partial class Class1
{
    //implementation
}

Here are some points to consider while implementing the partial classes:-

  • Use the partial keyword in each part of the partial class.
  • The name of each part of the partial class should be the same but the .cs file name can be different.
  • All parts of a partial class should be in the same namespace.
  • Each part of a partial class should be in the same assembly or DLL, in other words, you can’t create a partial class in source files of a different class library project.
  • Each part of a partial class has the same accessibility. (like, public/ internal)
  • If you inherit a class or interface on a partial class then it is inherited on all parts of a partial class.
  • Sealed part of the partial class results in the entire class being sealed.
  • If a part of a partial class is abstract then the entire class will be considered an abstract class.

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