title | description | ms.date | helpviewer_keywords | ||
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Interface Properties |
Properties can be declared on an interface in C#. This example declares an interface property accessor. |
08/20/2024 |
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Properties can be declared on an interface. The following example declares an interface property accessor:
:::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetDeclareInterfaceProperties":::
Interface properties typically don't have a body. The accessors indicate whether the property is read-write, read-only, or write-only. Unlike in classes and structs, declaring the accessors without a body doesn't declare an auto-implemented property. An interface can define a default implementation for members, including properties. Defining a default implementation for a property in an interface is rare because interfaces can't define instance data fields.
In this example, the interface IEmployee
has a read-write property, Name
, and a read-only property, Counter
. The class Employee
implements the IEmployee
interface and uses these two properties. The program reads the name of a new employee and the current number of employees and displays the employee name and the computed employee number.
You could use the fully qualified name of the property, which references the interface in which the member is declared. For example:
:::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetExplicitImplementation":::
The preceding example demonstrates Explicit Interface Implementation. For example, if the class Employee
is implementing two interfaces ICitizen
and IEmployee
and both interfaces have the Name
property, the explicit interface member implementation is necessary. That is, the following property declaration:
:::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetExplicitImplementation":::
Implements the Name
property on the IEmployee
interface, while the following declaration:
:::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetCitizenImplementation":::
Implements the Name
property on the ICitizen
interface.
:::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetPropertyExample"::: :::code language="csharp" source="./snippets/properties/interfaces.cs" id="SnippetUseProperty":::
Enter number of employees: 210
Enter the name of the new employee: Hazem Abolrous
The employee information:
Employee number: 211
Employee name: Hazem Abolrous