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Improve description of `limitations of extensions`

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还没有人认领这个 Issue。

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Issue 类型
文档
描述清晰度
描述清楚
活跃度
活跃
技术栈
csharp
领域
documentation

调研方向

阅读 docs/csharp/advanced-topics/interface-implementation/mixins-with-default-interface-methods.md,并结合 issue 中建议的措辞,审阅有关扩展成员解析的段落。更新说明,清楚描述变量的声明类型如何影响所调用的方法;当说明回应了提出的困惑,并与文章的术语一致时,即完成。

由索引模型根据 Issue 内容生成。

描述

advanced-concepts/subsvc dotnet-csharp/svc
Type of issue

Missing information

Description

I tried to understand the following sentences but it was not easy for me. For instance I missed the part that the method was not specified on interface so the method call resolved to e anxtension method.

Extension members are resolved at compile time, using the declared type of the variable. Classes that implement the interface can provide a better implementation for any extension member. Variable declarations must match the implementing type to enable the compiler to choose that implementation. When the compile-time type matches the interface, method calls resolve to the extension member.

I suggest we replace with

The compiler chooses an extension method based on the variable's declared type, not the object's actual type. If a class has its own method with the same name as an extension method, that method is used only when the variable is declared as that class. If the variable is declared as the interface, the compiler can't see the class's method, so it calls the extension method.

What do you think of it? Appreciate any feedbacks!

Page URL

https://learn.microsoft.com/en-us/dotnet/csharp/advanced-topics/interface-implementation/mixins-with-default-interface-methods

Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/advanced-topics/interface-implementation/mixins-with-default-interface-methods.md

Document Version Independent Id

98229926-6c7a-3ad1-ab5c-86231253986c

Platform Id

5f097f47-9790-5a92-55f5-70776d1c799f

Article author

@BillWagner

Metadata
  • ID: 2c7899e8-3f01-41d2-137a-e334b73699a4
  • PlatformId: 5f097f47-9790-5a92-55f5-70776d1c799f
  • Service: dotnet-csharp
  • Sub-service: advanced-concepts

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