powershell：创建一个语法错误的通用hashset？

Question

我在powershell 4.0中试过这个：

[System.Assembly]::LoadWithPartialName("System.Collections.Generic")
$m = New-Object '[System.Collections.Generic::HashSet](String)'
$m.GetType()

但是跑步会给出错误。我的用法不正确吗？我只有2行代码！

Unable to find type [System.Assembly]. Make sure that the assembly that contains this type is loaded.
At D:\Untitled1.ps1:1 char:1
+ [System.Assembly]::LoadWithPartialName("System.Collections.Generic")
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (System.Assembly:TypeName) [], RuntimeException
+ FullyQualifiedErrorId : TypeNotFound

New-Object : Cannot find type [[System.Collections.Generic::HashSet]                (String)]: verify that the assembly containing this type is loaded.
At D:\Untitled1.ps1:2 char:6
+ $m = New-Object '[System.Collections.Generic::HashSet](String)'
+      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidType: (:) [New-Object],         PSArgumentException
+ FullyQualifiedErrorId : TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

You cannot call a method on a null-valued expression.
At D:\Untitled1.ps1:3 char:1
+ $m.GetType()
+ ~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull

Answer 1

LoadWithPartialName（）位于[System.Assembly]，而不是New-Object。此外，您的[System.Reflection.Assembly]::LoadWithPartialName("System.Collections.Generic") $m = New-Object 'System.Collections.Generic.HashSet[String]' $m.GetType() 语法略有偏差。

     <% @page language = "java" %>
      <% @page isELIgnored = "false" %>
      < HTML >
      < BODY >
      < H2 > Session Update test < /H2>
        	session.setAttribute( "blah", "1234" );
        	session.setAttribute( "blah2", "1234" );
        	
        	<%
        		session.setAttribute("blah", "1234");
        		session.setAttribute("blah2", "1234");
        	%>
        	
        	<A href="updateSession.jsp">Update the Session info</A >
      < script >
      alert('Hi')
    var secondsBeforeExpire = $ {
      pageContext.session.maxInactiveInterval
    }
    var timeToDecide = 15; // Give client 15 seconds to choose.
    setInterval(function() {
      alert('MaxInactive Interval ==  ' + $ {
        pageContext.session.maxInactiveInterval
      })
    }, 1000); < /script>
        </BODY >
     < /HTML>

另请参阅：http://www.leeholmes.com/blog/2006/08/18/creating-generic-types-in-powershell/