How to do it...

1. Create a C# class library project, say ClassLibrary, in Visual Studio 2017.
2. From the top-level menu, navigate to Tools | Extensions and Updates.
3. Navigate to Online | Visual Studio Marketplace on the left tab of the dialog to view the available VSIXes in the Visual Studio extension gallery/marketplace:

1. Search analyzers in the search textbox in the upper-right corner of the dialog and download an analyzer VSIX, say Refactoring Essentials for Visual Studio:

1. Once the download completes, you will get a message at the bottom of the dialog saying that the install will be scheduled to execute once Visual Studio and related windows are closed:

1. Close the dialog and then close the Visual Studio instance to start the install.
2. In the VSIX Installer dialog, click on Modify to start installation:

1. The subsequent message prompts you to kill all the active Visual Studio and satellite processes. Save all your relevant work in all the open Visual Studio instances and click on End Tasks to kill these processes and install the VSIX:

1. After installation, restart VS, click on Tools | Extensions And Updates, and verify that Refactoring Essentials VSIX is installed:

1. Create a new C# project with the following source code and verify analyzer diagnostic RECS0085 (Redundant array creation expression) in the error list:

namespace ClassLibrary
{
  public class Class1
  {
    void Method()
    {
      int[] values = new int[] { 1, 2, 3 };
    }
  }
}

1. Build the project from Visual Studio 2017 or the command line and confirm that no analyzer diagnostic shows up in the output window or the command line, respectively, confirming that the VSIX analyzer did not execute as a part of the build.