括号首选项（IDE0047 和 IDE0048）

项目
02/12/2025

本文介绍两个相关规则，IDE0047 和 IDE0048。

财产	价值
规则 ID	IDE0047
标题	删除不必要的括号
类别	样式
子类别	语言规则（括号首选项）
适用的语言	C# 和 Visual Basic
引入的版本	Visual Studio 2017
选项	`dotnet_style_parentheses_in_arithmetic_binary_operators`
	`dotnet_style_parentheses_in_relational_binary_operators`
	`dotnet_style_parentheses_in_other_binary_operators`
	`dotnet_style_parentheses_in_other_operators`

财产	价值
规则 ID	IDE0048
标题	为清楚起见添加括号
类别	样式
子类别	语言规则（括号首选项）
适用的语言	C# 和 Visual Basic
引入的版本	Visual Studio 2017
选项	`dotnet_style_parentheses_in_arithmetic_binary_operators`
	`dotnet_style_parentheses_in_relational_binary_operators`
	`dotnet_style_parentheses_in_other_binary_operators`
	`dotnet_style_parentheses_in_other_operators`

概述

本节中的样式规则涉及括号首选项，包括使用括号来阐明算术、关系和其他二进制运算符的优先级。

选项

此规则具有关联的选项，用于根据运算符类型指定首选项：

算术二元运算符 - dotnet_style_parentheses_in_arithmetic_binary_operators
关系二元运算符 - dotnet_style_parentheses_in_relational_binary_operators
其他二元运算符 - dotnet_style_parentheses_in_other_binary_operators
其他运算符 - dotnet_style_parentheses_in_other_operators

有关配置选项的信息，请参阅选项格式。

dotnet_style_parentheses_in_arithmetic_binary_operators

财产	价值	描述
选项名称	dotnet_style_parentheses_in_arithmetic_binary_operators
选项值	`always_for_clarity`	首选括号来阐明算术运算符优先级
	`never_if_unnecessary`	当算术运算符优先级明显时，首选无括号
默认选项值	`always_for_clarity`

算术二进制运算符包括：*、/、%、+、-、<<、>>、&、^和 |。

// dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
var v = a + (b * c);

// dotnet_style_parentheses_in_arithmetic_binary_operators = never_if_unnecessary
var v = a + b * c;

' dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
Dim v = a + (b * c)

' dotnet_style_parentheses_in_arithmetic_binary_operators = never_if_unnecessary
Dim v = a + b * c

dotnet_style_parentheses_in_relational_binary_operators

财产	价值	描述
选项名称	dotnet_style_parentheses_in_relational_binary_operators
选项值	`always_for_clarity`	首选括号以阐明关系运算符优先级
	`never_if_unnecessary`	当关系运算符优先级明显时，首选不带括号
默认选项值	`always_for_clarity`

关系二进制运算符包括：>、<、<=、>=、is、as、==和 !=。

// dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
var v = (a < b) == (c > d);

// dotnet_style_parentheses_in_relational_binary_operators = never_if_unnecessary
var v = a < b == c > d;

' dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
Dim v = (a < b) = (c > d)

' dotnet_style_parentheses_in_relational_binary_operators = never_if_unnecessary
Dim v = a < b = c > d

dotnet_style_parentheses_in_other_binary_operators

财产	价值	描述
选项名称	dotnet_style_parentheses_in_other_binary_operators
选项值	`always_for_clarity`	首选括号以阐明其他二进制运算符优先级
	`never_if_unnecessary`	当其他二进制运算符优先级明显时，首选不带括号
默认选项值	`always_for_clarity`

其他二进制运算符包括：&&、||和 ??。

// dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
var v = a || (b && c);

// dotnet_style_parentheses_in_other_binary_operators = never_if_unnecessary
var v = a || b && c;

' dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
Dim v = a OrElse (b AndAlso c)

' dotnet_style_parentheses_in_other_binary_operators = never_if_unnecessary
Dim v = a OrElse b AndAlso c

dotnet_style_parentheses_in_other_operators

财产	价值	描述
选项名称	dotnet_style_parentheses_in_other_operators
选项值	`always_for_clarity`	首选括号以阐明其他运算符优先级
	`never_if_unnecessary`	当其他运算符优先级明显时，首选不带括号
默认选项值	`never_if_unnecessary`

此选项适用于除以下 以外的运算符：

*、/、%、+、-、<<、>>、&、^、|>、<、<=、>=、is、as、==、!=&&、||、??

// dotnet_style_parentheses_in_other_operators = always_for_clarity
var v = (a.b).Length;

// dotnet_style_parentheses_in_other_operators = never_if_unnecessary
var v = a.b.Length;

' dotnet_style_parentheses_in_other_operators = always_for_clarity
Dim v = (a.b).Length

' dotnet_style_parentheses_in_other_operators = never_if_unnecessary
Dim v = a.b.Length

禁止显示警告

如果只想取消单个冲突，请将预处理器指令添加到源文件以禁用，然后重新启用规则。

#pragma warning disable IDE0047 // Or IDE0048
// The code that's violating the rule is on this line.
#pragma warning restore IDE0047 // Or IDE0048

若要禁用文件、文件夹或项目的规则，请将其严重性设置为配置文件中的 none。

[*.{cs,vb}]
dotnet_diagnostic.IDE0047.severity = none
dotnet_diagnostic.IDE0048.severity = none

若要禁用所有代码样式规则，请将类别 Style 的严重性设置为配置文件中的 none。

[*.{cs,vb}]
dotnet_analyzer_diagnostic.category-Style.severity = none

有关详细信息，请参阅如何取消代码分析警告。

通过