Why implement idisposable

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What if we inherit the LogWriter class? Thanks to all the plumbing code in the base class we only have to override Dispose bool. Now ; WriteLine string. Empty ; base. There are a couple of great articles on Code Project about IDisposable.

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Leave a Reply Your name as it will be displayed on the posted comment. This releases them faster than if they were reclaimed non-deterministically. If the method call comes from a finalizer, only the code that frees unmanaged resources should execute.

The implementer is responsible for ensuring that the false path doesn't interact with managed objects that may have been reclaimed. This is important because the order in which the garbage collector destroys managed objects during finalization is non-deterministic. If your class owns a field or property, and its type implements IDisposable , the containing class itself should also implement IDisposable.

A class that instantiates an IDisposable implementation and storing it as an instance member, is also responsible for its cleanup. This is to help ensure that the referenced disposable types are given the opportunity to deterministically perform cleanup through the Dispose method. In this example, the class is sealed or NotInheritable in Visual Basic. All non-sealed classes or Visual Basic classes not modified as NotInheritable should be considered a potential base class, because they could be inherited.

If you implement the dispose pattern for any potential base class, you must provide the following:. It is possible for a base class to only reference managed objects, and implement the dispose pattern. In these cases, a finalizer is unnecessary. A finalizer is only required if you directly reference unmanaged resources. Here's an example of the general pattern for implementing the dispose pattern for a base class that uses a safe handle. The previous example uses a SafeFileHandle object to illustrate the pattern; any object derived from SafeHandle could be used instead.

Note that the example does not properly instantiate its SafeFileHandle object. Here's the general pattern for implementing the dispose pattern for a base class that overrides Object. In C , you implement a finalization by providing a finalizer , not by overriding Object. A class derived from a class that implements the IDisposable interface shouldn't implement IDisposable , because the base class implementation of IDisposable.

Dispose is inherited by its derived classes. Instead, to clean up a derived class, you provide the following:. Here's an example of the general pattern for implementing the dispose pattern for a derived class that uses a safe handle:. Here's the general pattern for implementing the dispose pattern for a derived class that overrides Object. Finalize :. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

Privacy policy. For more information, see Clean up unmanaged resources. NET guide and Dispose pattern. By default, this rule only looks at externally visible types, but this is configurable. All IDisposable types should implement the Dispose pattern correctly. Remove IDisposable from the list of interfaces that are implemented by your type, and override the base class Dispose implementation instead.

Remove the finalizer from your type, override Dispose bool disposing , and put the finalization logic in the code path where 'disposing' is false. Override Dispose bool disposing , and put the dispose logic in the code path where 'disposing' is true.

Make sure that Dispose is declared as public and sealed. Rename your dispose method to Dispose and make sure that it's declared as public and sealed. Modify Dispose so that it calls Dispose true , then calls SuppressFinalize on the current object instance this , or Me in Visual Basic , and then returns. If you create an unsealed type that declares and implements the IDisposable interface, make sure that the implementation of IDisposable follows the pattern that is described earlier in this section.

You can configure this option for just this rule, for all rules, or for all rules in this category Design. For more information, see Code quality rule configuration options.