括号首选项（IDE0047 和 IDE0048）

本文介绍两个相关规则，IDE0047 和 IDE0048。

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

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

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

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

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。

另请参阅

• 代码样式语言规则
• 代码样式规则参考