JetBrains Rider 2017.2 Help

Generating Dispose Pattern

Code | Generate | Dispose Pattern
Alt+Insert | Dispose Pattern

JetBrains Rider helps you automatically generate various implementations of IDisposable depending on kind of resources that your class owns:

  • If your class only owns managed IDisposable resources, JetBrains Rider will help you generate a simple implementation of public void Dispose() without parameters, where Dispose() is called on selected disposable members.
  • If your class only owns unmanaged resources, JetBrains Rider will additionally generate destructor and a ReleaseUnmanagedResources method where you could write your cleanup code.
  • If your class owns or will potentially own (via inheritance) both managed and unmanaged resources, JetBrains Rider will additionally create a Dispose(bool disposing) method which could be overridden by the inheritors.

To configure how the disposable pattern is implemented, use option in the Generate dialog.

In the example below, this command is used to generate a disposable pattern for managed logger and resource fields, with a single option to generate null checks for these fields.

Before generationAfter generation
class MyClass { private Logger logger; private IDisposable resource; }
class MyClass : IDisposable { private Logger logger; private IDisposable resource; public void Dispose() { logger?.Dispose(); resource?.Dispose(); } }

To generate a dispose pattern

  1. In the editor, set the caret on the type name or within a type at the line where you want to insert a dispose pattern. If the caret is on the type name, generated code will be added in the beginning of the type declaration.
  2. Press Alt+Insert or choose Code | Generate... in the main menu.
  3. In the Generate pop-up menu, select Dispose Pattern.
  4. In the Generate dialog that appears, you will see a list of private properties and fields of type assignable to IDisposable. Select some or all of these type members, and JetBrains Rider will generate wrappers in the current type that delegate execution to selected type members.
    Generating a dispose pattern with JetBrains Rider

    Optionally, use the following controls in the dialog:

    • Fields can be null — appears if there are any nullable fields or properties in your type. By default, this check box is selected, meaning that JetBrains Rider will generate null checks for selected fields. You can clear this check box if you do not need null checks.
    • I have unmanaged resources — if this check box is selected, JetBrains Rider will additionally generate destructor and a ReleaseUnmanagedResources method where you could write your cleanup code.
    • I plan to inherit from this class — if this check box is selected, JetBrains Rider will additionally create a Dispose(bool disposing) method which could be overridden by the inheritors.
    • Dispose already exists — appears if an implementation of Dispose() already exists and lets you choose whether to:
      • Replace the method if it already exists.
      • Put the newly generated method side by side with the existing one.
      • Skip generating a new method altogether.
    • Destructor already exists — appears if you have chosen the I have unmanaged resources option and the class already has a destructor. Use this selector to choose whether to:
      • Replace the method if it already exists.
      • Put the newly generated method side by side with the existing one.
      • Skip generating a new method altogether.
  5. Click OK to complete the wizard.

This action is also available as a quick-fix if IDisposable is not implemented.

A quick-fix that helps generate dispose pattern
Last modified: 21 November 2017

See Also