In c#, the partial method is a special type of method that will contain a declaration part in one partial class and the definition part in another partial class or in the same partial class.
Generally, the partial methods will exist either in partial class or struct, and they will contain two main parts one is declaration and definition. Here, the declaration part represents a signature of the partial method, and the definition part represents an implementation of the partial method.
In the partial method, the definition part is optional, so it may or may not have an implementation in partial classes. In case the implementation part of the partial method is not available in any partial class. The compiler will remove the method's definition and all the calls related to that particular method in the final class.
Following is the example of implementing a partial method using
partial keyword in two class files, User1.cs and User2.cs.
If you observe the above code, we declared a partial method called GetUserDetails in User1.cs class file using
partial keyword along with a standard method called TestMethod().
If you observe the above code, we implemented a partial method called GetUserDetails in User1.cs class file using
partial keyword with required variables and constructor.
When you execute the above code, the compiler will combine these two partial classes into one User class as shown below.
This is how the compiler will combine all the partial classes into a single class while executing the application in the c# programming language.
In c#, we need to follow certain rules to implement the partial method in our applications.
partialkeyword and method must return void.
Following is the example of defining a partial method in partial class using
partial modifier in c# programming language.
If you observe the above example, we created a partial method GetUserDetails in two partial classes using
partial keyword to perform required operations.
When you execute the above c# program, we will get the result as shown below.
This is how we can use partial methods in partial class or structure when we have a method declaration and implementation in multiple files with
partial modifier based on our requirements.