ReSharper 2021.2 Help

Convert Interface to Abstract Class refactoring

This refactoring converts interfaces into abstract classes thus helping you quickly change hierarchical dependency among a set of classes and interfaces.

Consider the following example:

interface Shape { double Area { get; } void Draw(); } class Circle : Shape { private readonly int radius; public double Area => Math.PI * Math.Pow(radius, 2); public void Draw() { //do something } }
abstract class Shape { public abstract double Area { get; } public abstract void Draw(); } class Circle : Shape { private readonly int radius; public override double Area => Math.PI * Math.Pow(radius, 2); public override void Draw() { //do something } }

Convert an interface into an abstract class

  1. Select an interface in one of the following ways:

    • In the editor, set the caret at the name of an interface.

    • Select an interface in the Solution Explorer.

    • Select an interface in the File Structure window.

    • Select an interface in the Class View.

    • Select an interface in the Object Browser.

    • Select an interface in the type dependency diagram.

  2. Do one of the following:

    • Press Control+Shift+R and then choose Convert Interface to Abstract Class

    • Right-click and choose Refactor | Convert Interface to Abstract Class in the context menu.

    • Choose ReSharper | Refactor | Convert | Method to Indexer… in the main menu.

  3. If no conflicts are found, ReSharper performs the refactoring immediately. Otherwise, it prompts you to resolve conflicts.

This feature is supported in the following languages and technologies:

Language: C#Language: VB.NETLanguage: C++Language: HTMLLanguage: ASP.NETLanguage: RazorLanguage: JavaScriptLanguage: TypeScriptLanguage: CSSLanguage: XMLLanguage: XAMLLanguage: ResxLanguage: Build ScriptsLanguage: ProtobufLanguage: JSON
Feature is available in C#Feature is available in Visual Basic .NET Feature is not available in C++ Feature is not available in HTML Feature is not available in ASP.NET Feature is not available in Razor Feature is not available in JavaScript Feature is not available in TypeScript Feature is not available in CSS Feature is not available in XML Feature is not available in XAML Feature is not available in Resource files Feature is not available in build script files Feature is not available in Protobuf Feature is not available in JSON

The instructions and examples given here address the use of the feature in C#. For details specific to other languages, see corresponding topics in the ReSharper by language section.

Last modified: 08 March 2021