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What is a weak reference programming?
From Wikipedia, the free encyclopedia. In computer programming, a weak reference is a reference that does not protect the referenced object from collection by a garbage collector, unlike a strong reference.
What is purpose of weak reference?
A weak reference allows the garbage collector to collect an object while still allowing an application to access the object. If you need the object, you can still obtain a strong reference to it and prevent it from being collected.
What is the purpose of weak reference?
What is the difference between strong and weak references?
The key difference between a strong and a weak or unowned reference is that a strong reference prevents the class instance it points to from being deallocated. In other words, weak and unowned references cannot prevent a class instance from being deallocated.
When does an application have a weak reference?
The application is said to have a strong reference to the object. A weak reference permits the garbage collector to collect the object while still allowing the application to access the object. A weak reference is valid only during the indeterminate amount of time until the object is collected when no strong references exist.
What does it mean when an object has a weak reference?
Weak References. The garbage collector cannot collect an object in use by an application while the application’s code can reach that object. The application is said to have a strong reference to the object. A weak reference permits the garbage collector to collect the object while still allowing the application to access the object.
How to use weak references in.net codeproject?
For example, to force the situation, we can use this code: WeakReference reference = new WeakReference ( null ); reference.Target = new object (); // Read the reference.Target many times if you want, only // to represent that you are using it.
Are there any classes that give you weak references?
Some types that give you weak references. There are three main types in .NET that give us access to weak references: WeakReference class: This is usually the best option if you want a weak reference to a single item; GCHandle struct: We can see it as an “unsafe” reference.