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Can Async Methods Be Used in C# Properties?

Jan 11, 2025 am 06:56 AM

Can Async Methods Be Used in C# Properties?

Asynchronous methods in C# properties: Design considerations

This article discusses the issue of whether the getter or setter method of a property can call an asynchronous method in C#. The answer is no, this is due to design considerations.

The contradiction of "asynchronous attributes"

The essence of a property is to represent the current state of an object and provide immediate access to its value. Introducing asynchronous calls into properties violates this design principle. Properties will no longer reflect the current state, but the ongoing operation.

Alternatives to async properties

Instead of using async properties, consider the following alternatives:

  • Async methods: Move asynchronous operations into a dedicated method that returns a value.
  • Asynchronous initialization: Use the asynchronous InitAsync() method to retrieve or calculate data that can be bound to a property.
  • Asynchronous Lazy Loading: Use AsyncLazy in AsyncEx or similar technology to cache expensive calculations for subsequent retrieval.

By adopting these alternatives, you can maintain the clarity and integrity of property-based interactions while accommodating asynchronous operations where appropriate.

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