What is public interface C#?
In C#, an interface can be defined using the interface keyword. An interface can contain declarations of methods, properties, indexers, and events. However, it cannot contain fields, auto-implemented properties. The following interface declares some basic functionalities for the file operations.
Can we use public in interface in C#?
Interface Members Default to “public” In C# 8, interface members are still public by default. But since other access modifiers are allowed (as we’ll see in a bit), public is also allowed.
Can Interfaces be public?
The Interface Body All abstract, default, and static methods in an interface are implicitly public , so you can omit the public modifier. In addition, an interface can contain constant declarations. All constant values defined in an interface are implicitly public , static , and final .
Do interfaces have to be public methods?
Technically it doesn’t matter, of course. A class method that implements an interface is always public .
Why methods in interface are public?
Interface methods are implicitly public in C# because an interface is a contract meant to be used by other classes. In addition, you must declare these methods to be public, and not static, when you implement the interface.
How many types of interfaces are there in C#?
Some of the interface types in C# include. IEnumerable − Base interface for all generic collections. IList − A generic interface implemented by the arrays and the list type. IDictionary − A dictionary collection.
Why do interfaces have to be public?
Can interfaces be private?
Therefore, the members of an interface cannot be private. If you try to declare the members of an interface private, a compile-time error is generated saying “modifier private not allowed here”.
How many interfaces can a class implement in C#?
The C# language imposes no limit on the number of interfaces.
Why abstract class is faster than interface in C#?
An abstract class is fast. The interface is absolutely abstract and cannot be instantiated. An abstract class cannot be instantiated. The interface cannot have fields.
Can a interface be private?
Can we declare interface as abstract?
Interface contains only abstract methods that can’t be instantiated and it is declared by keyword interface. A class that is declared with the abstract keyword is known as an abstract class in Java.
Can we declare interface as private?
What is not allowed in interface?
Interfaces can declare only Constant. Instance variables are not allowed. This means all variables inside the Interface must be public, static, final.
What are the characteristics of an interface class?
An interface class (or struct) must be declared within a namespace and may have public or private accessibility. Only public interfaces are emitted to metadata. The members of an interface can include properties, methods, and events. All interface members are implicitly public and virtual.
Can a public ref class have a generic interface as a member?
A public ref class can have a generic interface type as a private member. The following code snippet shows how to declare a generic interface class and then implement it in a private ref class and use the ref class as a private member in a public ref class.
What are the components of an interface in C?
In addition, beginning with C# 8.0, an interface may include: Static constructor. Member declarations using the explicit interface implementation syntax. Explicit access modifiers (the default access is public ).
How do I access the members of an interface?
By default, members of an interface are abstract and public. Note: Interfaces can contain properties and methods, but not fields. To access the interface methods, the interface must be “implemented” (kinda like inherited) by another class. To implement an interface, use the : symbol (just like with inheritance).