Extract Global Using refactoring

This refactoring allows you to convert one or more local using directives into global using directives and move them to a new or existing file.

In the example below, we apply this refactoring to using System.Collections; in file One.cs and place the extracted using to GlobalUsings.cs.

            
// One.cs
using System.Collections;

class One
{
    void Test(ArrayList list)
    {
        // do something
    }
}

// Two.cs
using System.Collections;
using System.Xml;

class Two
{
    void Test(ArrayList list,
                XmlReader reader)
    {
        // do something
    }
}

// GlobalUsings.cs
global using System.Linq;
global using System.Threading.Tasks;

        

            
// One.cs
class One
{
    void Test(ArrayList list)
    {
        // do something
    }
}

// Two.cs
using System.Xml;

class Two
{
    void Test(ArrayList list,
                XmlReader reader)
    {
        // do something
    }
}

// GlobalUsings.cs
global using System.Linq;
global using System.Threading.Tasks;
global using System.Collections;

        

Extract a global using

Set the caret at a using directive or select multiple directives.
Do one of the following:
- Press Control+Shift+R and then choose Extract Global Using.
- Right-click and choose Refactor | Extract Global Using from the context menu.
- Choose ReSharper | Refactor | Extract | Extract Global Using… from the main menu.
The Extract Global Using dialog will open.
Specify where the global using should be moved — this could be any existing .cs file in the current project or a new .cs file.
To apply the refactoring, click Next.
ReSharper will remove the using directives for the selected namespaces from all files in the project (because a local using becomes redundant as soon as a global using appears for the same namespace) and add these directives as global using directives to the specified file.