Default Interface Methods C# 8 in depth

Examples and Code Demos for the Default Interface Methods

Default Interface Methods:

• A Very simple example
• Keyword abstract and virtual
• Using the keyword This
• Using Properties
• Diamond Problem
• Using Async
• Generic
• Player example
• Limitations and errors

For more information:

Required: Visual Studio 2017 Build 15.6.2

How to build:

Download the source code from Github:

1. Clone the repository https://github.com/dotnet/roslyn

2. Switch to the branch https://github.com/dotnet/roslyn/tree/features/DefaultInterfaceImplementation

3. Read and folow the roslyn How To build: execute Restore.cmd and then Build.cmd

4. Open the roslyn solution file and change the following files:

   ..src\Compilers\CSharp\Portable\CSharpParseOptions.cs

    To
   
    internal bool IsFeatureEnabled(MessageID feature)
    {
   
        return true;
    }
   

..src\Compilers\CSharp\Portable\Parser\SyntaxParser.cs

     To

    protected bool IsFeatureEnabled(MessageID feature)
    {

        return true;
    }

5. Select and set "VisualStudioSetup.Next" as StartUp Project
6. F5 and when the new Visual Studio is started then open the DefualtInterfaceMethodsDemo.sln
7. F5 and enjoy the new Feature :-)!