Not all. NET Framework classes can be created using new object For example, if you try to create a System.Environment or System.Math object using new object, you will receive the following error message:
PS> New-Object System.Environment New-Object : Constructor not found. Cannot find an appropriate constructor for type System.Environment. At line:1 char:11 + New-Object <<<< System.Environment PS> New-Object System.Math New-Object : Constructor not found. Cannot find an appropriate constructor for type System.Math. At line:1 char:11 + New-Object <<<< System.Math
These errors occur because new objects cannot be created from these classes These classes are reference libraries for methods and properties that do not change state You don't need to create these classes, just use them Such classes and methods are called static classes because they are not created, destroyed, or changed.
The System.Environment class contains general information about the working environment of the current process, which is powershell.exe if it works within Windows PowerShell.
If you try to view the details of this class by typing [system. Environment] | get member, the object type will be reported as System.RuntimeType instead of System.Environment:
PS> [System.Environment] | Get-Member TypeName: System.RuntimeType
An example of how to use this type is as follows:
[System.Environment]::Commandline [System.Environment]::OSVersion [System.Environment]::HasShutdownStarted
In addition, we can use another static class to perform mathematical operations (System.Math)
PS> [System.Math]::Sqrt(9) 3 PS> [System.Math]::Pow(2,3) 8 PS> [System.Math]::Floor(3.3) 3 PS> [System.Math]::Floor(-3.3) -4 PS> [System.Math]::Ceiling(3.3) 4 PS> [System.Math]::Ceiling(-3.3) -3 PS> [System.Math]::Max(2,7) 7 PS> [System.Math]::Min(2,7) 2 PS> [System.Math]::Truncate(9.3) 9 PS> [System.Math]::Truncate(-9.3) -9
Use get member to view the operation methods supported by the static class:
PS> [System.Math] | Get-Member -Static -MemberType Methods TypeName: System.Math Name MemberType Definition ---- ---------- ---------- Abs Method static System.Single Abs(Single value), static Sy... Acos Method static System.Double Acos(Double d) Asin Method static System.Double Asin(Double d) Atan Method static System.Double Atan(Double d) Atan2 Method static System.Double Atan2(Double y, Double x) BigMul Method static System.Int64 BigMul(Int32 a, Int32 b) Ceiling Method static System.Double Ceiling(Double a), static Sy... Cos Method static System.Double Cos(Double d) Cosh Method static System.Double Cosh(Double value) DivRem Method static System.Int32 DivRem(Int32 a, Int32 b, Int3... Equals Method static System.Boolean Equals(Object objA, Object ... Exp Method static System.Double Exp(Double d) Floor Method static System.Double Floor(Double d), static Syst... IEEERemainder Method static System.Double IEEERemainder(Double x, Doub... Log Method static System.Double Log(Double d), static System... Log10 Method static System.Double Log10(Double d) Max Method static System.SByte Max(SByte val1, SByte val2), ... Min Method static System.SByte Min(SByte val1, SByte val2), ... Pow Method static System.Double Pow(Double x, Double y) ReferenceEquals Method static System.Boolean ReferenceEquals(Object objA... Round Method static System.Double Round(Double a), static Syst... Sign Method static System.Int32 Sign(SByte value), static Sys... Sin Method static System.Double Sin(Double a) Sinh Method static System.Double Sinh(Double value) Sqrt Method static System.Double Sqrt(Double d) Tan Method static System.Double Tan(Double a) Tanh Method static System.Double Tanh(Double value) Truncate Method static System.Decimal Truncate(Decimal d), static...
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