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Why method assigns the parameter to refer to a different object aren't visible from the caller, when pass a value type by reference? #41087

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Unarimit opened this issue May 27, 2024 · 3 comments
Open

Why method assigns the parameter to refer to a different object aren't visible from the caller, when pass a value type by reference? #41087

Unarimit opened this issue May 27, 2024 · 3 comments
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doc-enhancement Improve the current content [org][type][category] dotnet-csharp/svc lang-reference/subsvc Pri1 High priority, do before Pri2 and Pri3

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@Unarimit
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Type of issue

Typo

Description

Does it mean such method as void foo(ref int num) is not reasonable? I can not got it.

Page URL

https://learn.microsoft.com/zh-cn/dotnet/csharp/language-reference/keywords/method-parameters

Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/language-reference/keywords/method-parameters.md

Document Version Independent Id

7241f712-8d73-b5e0-37c0-5f05c92412c6

Article author

@BillWagner

Metadata

  • ID: b8dd92fe-5053-1bc6-1c8f-cf9f88635cb5
  • Service: dotnet-csharp
  • Sub-service: lang-reference
@dotnet-bot dotnet-bot added the ⌚ Not Triaged Not triaged label May 27, 2024
@issues-automation issues-automation bot added dotnet-csharp/svc lang-reference/subsvc Pri1 High priority, do before Pri2 and Pri3 labels May 27, 2024
@Unarimit
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this issue appear in this subheading https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#combinations-of-parameter-type-and-argument-mode

@BillWagner BillWagner added the doc-enhancement Improve the current content [org][type][category] label May 28, 2024
@dotnet-bot dotnet-bot removed the ⌚ Not Triaged Not triaged label May 28, 2024
@BillWagner
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We should update this page and introduce the term "referent", which as added to the standard in C# 7.3. Then, that can clarify how a ref argument can be assigned:

  • Assigning a new value changes the value of the current referent: num = 12; That change is visible outside the method
  • Ref assigning to change the referent means the variable refers to different storage: num ref = someVariable; That change won't be visible outside the method.

Adding this to our backlog to fix on our next update in this section.

@Unarimit
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We should update this page and introduce the term "referent", which as added to the standard in C# 7.3. Then, that can clarify how a ref argument can be assigned:

  • Assigning a new value changes the value of the current referent: num = 12; That change is visible outside the method
  • Ref assigning to change the referent means the variable refers to different storage: num ref = someVariable; That change won't be visible outside the method.

Adding this to our backlog to fix on our next update in this section.

Thank you for your reply. Yeah, a new feature🥲

@BillWagner BillWagner mentioned this issue May 29, 2024
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doc-enhancement Improve the current content [org][type][category] dotnet-csharp/svc lang-reference/subsvc Pri1 High priority, do before Pri2 and Pri3
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@BillWagner @dotnet-bot @Unarimit