布尔和bool有什么区别？

Question

布尔和bool有什么区别？

5

我看到了一个类似于这样的函数：

function
{
    [CmdletBinding()]
    [OutputType([Boolean])]
    param (
    [bool] $param
    }

    # ...
}

这里Boolean和bool有什么区别？

- metablaster

2个回答

3

bool 是 System.Boolean 的别名，就像 int 是 System.Int32 的别名一样。

例子：

PS C:\Users\aruns7> [bool] $yourValue = 1
PS C:\Users\aruns7> $yourValue.gettype().fullname
System.Boolean

Boolean代表了System.Boolean类，而bool是用于创建Boolean对象的System.Boolean关键字。

- ArunPratap

2

虽然您的回答很有帮助，但请注意 bool 在技术上并不是一个 _关键字_：[bool] 是使用 类型加速器 的 _类型文字_，如 js2010 的回答所示。此外，在 .NET 术语中，System.Boolean 在技术上不是一个 _类_，而是一个 struct（一个 _值类型_）。 - mklement0

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原文链接

- js2010 · Accepted Answer

[bool] 是一个用于 powershell 类型加速器的关键字。

我在使用 powershell 7，如果有官方文档，我没有找到（除了像往常一样的《Windows Powershell in Action》）。

[psobject].Assembly.GetType("System.Management.Automation.TypeAccelerators")::get

Key                          Value
---                          -----
Alias                        System.Management.Automation.AliasAttribute
AllowEmptyCollection         System.Management.Automation.AllowEmptyCollectionAttribute
AllowEmptyString             System.Management.Automation.AllowEmptyStringAttribute
AllowNull                    System.Management.Automation.AllowNullAttribute
ArgumentCompleter            System.Management.Automation.ArgumentCompleterAttribute
ArgumentCompletions          System.Management.Automation.ArgumentCompletionsAttribute
array                        System.Array
bool                         System.Boolean
byte                         System.Byte
char                         System.Char
CmdletBinding                System.Management.Automation.CmdletBindingAttribute
datetime                     System.DateTime
decimal                      System.Decimal
double                       System.Double
DscResource                  System.Management.Automation.DscResourceAttribute
ExperimentAction             System.Management.Automation.ExperimentAction
Experimental                 System.Management.Automation.ExperimentalAttribute
ExperimentalFeature          System.Management.Automation.ExperimentalFeature
float                        System.Single
single                       System.Single
guid                         System.Guid
hashtable                    System.Collections.Hashtable
int                          System.Int32
int32                        System.Int32
short                        System.Int16
int16                        System.Int16
long                         System.Int64
int64                        System.Int64
ciminstance                  Microsoft.Management.Infrastructure.CimInstance
cimclass                     Microsoft.Management.Infrastructure.CimClass
cimtype                      Microsoft.Management.Infrastructure.CimType
cimconverter                 Microsoft.Management.Infrastructure.CimConverter
IPEndpoint                   System.Net.IPEndPoint
NullString                   System.Management.Automation.Language.NullString
OutputType                   System.Management.Automation.OutputTypeAttribute
ObjectSecurity               System.Security.AccessControl.ObjectSecurity
Parameter                    System.Management.Automation.ParameterAttribute
PhysicalAddress              System.Net.NetworkInformation.PhysicalAddress
pscredential                 System.Management.Automation.PSCredential
PSDefaultValue               System.Management.Automation.PSDefaultValueAttribute
pslistmodifier               System.Management.Automation.PSListModifier
psobject                     System.Management.Automation.PSObject
pscustomobject               System.Management.Automation.PSObject
psprimitivedictionary        System.Management.Automation.PSPrimitiveDictionary
ref                          System.Management.Automation.PSReference
PSTypeNameAttribute          System.Management.Automation.PSTypeNameAttribute
regex                        System.Text.RegularExpressions.Regex
DscProperty                  System.Management.Automation.DscPropertyAttribute
sbyte                        System.SByte
string                       System.String
SupportsWildcards            System.Management.Automation.SupportsWildcardsAttribute
switch                       System.Management.Automation.SwitchParameter
cultureinfo                  System.Globalization.CultureInfo
bigint                       System.Numerics.BigInteger
securestring                 System.Security.SecureString
timespan                     System.TimeSpan
ushort                       System.UInt16
uint16                       System.UInt16
uint                         System.UInt32
uint32                       System.UInt32
ulong                        System.UInt64
uint64                       System.UInt64
uri                          System.Uri
ValidateCount                System.Management.Automation.ValidateCountAttribute
ValidateDrive                System.Management.Automation.ValidateDriveAttribute
ValidateLength               System.Management.Automation.ValidateLengthAttribute
ValidateNotNull              System.Management.Automation.ValidateNotNullAttribute
ValidateNotNullOrEmpty       System.Management.Automation.ValidateNotNullOrEmptyAttribute
ValidatePattern              System.Management.Automation.ValidatePatternAttribute
ValidateRange                System.Management.Automation.ValidateRangeAttribute
ValidateScript               System.Management.Automation.ValidateScriptAttribute
ValidateSet                  System.Management.Automation.ValidateSetAttribute
ValidateTrustedData          System.Management.Automation.ValidateTrustedDataAttribute
ValidateUserDrive            System.Management.Automation.ValidateUserDriveAttribute
version                      System.Version
void                         System.Void
ipaddress                    System.Net.IPAddress
DscLocalConfigurationManager System.Management.Automation.DscLocalConfigurationManagerAttribute
WildcardPattern              System.Management.Automation.WildcardPattern
X509Certificate              System.Security.Cryptography.X509Certificates.X509Certificate
X500DistinguishedName        System.Security.Cryptography.X509Certificates.X500DistinguishedName
xml                          System.Xml.XmlDocument
CimSession                   Microsoft.Management.Infrastructure.CimSession
mailaddress                  System.Net.Mail.MailAddress
semver                       System.Management.Automation.SemanticVersion
scriptblock                  System.Management.Automation.ScriptBlock
pspropertyexpression         Microsoft.PowerShell.Commands.PSPropertyExpression
psvariable                   System.Management.Automation.PSVariable
type                         System.Type
psmoduleinfo                 System.Management.Automation.PSModuleInfo
powershell                   System.Management.Automation.PowerShell
runspacefactory              System.Management.Automation.Runspaces.RunspaceFactory
runspace                     System.Management.Automation.Runspaces.Runspace
initialsessionstate          System.Management.Automation.Runspaces.InitialSessionState
psscriptmethod               System.Management.Automation.PSScriptMethod
psscriptproperty             System.Management.Automation.PSScriptProperty
psnoteproperty               System.Management.Automation.PSNoteProperty
psaliasproperty              System.Management.Automation.PSAliasProperty
psvariableproperty           System.Management.Automation.PSVa

制作您自己的内容：

$Accelerators = [PowerShell].Assembly.GetType("System.Management.Automation.TypeAccelerators")
$Accelerators::Add('dt','system.datetime') 
[dt]'1:00'

Saturday, February 22, 2020 1:00:00 AM