PowerShell中缺少成员方法

Question

我有（又一个）PowerShell查询。我在PowerShell中有一个数组，我需要使用remove（）和split命令。

通常你设置一个数组（或变量），并存在上述方法。在下面的$ csv2数组中，两个方法都缺失，我使用get-member cmd进行了检查。

我该如何去使用删除来摆脱nan的线条。另外我如何将列分成两个不同的变量。此刻数组中的每个元素都显示一行，对于每行我需要将其转换为两个变量，每列一个。

时间戳利用
--------- -----------
1276505880 2.0763250000e + 00
1276505890 1.7487730000e + 00
1276505900 1.6906890000e + 00
1276505910 1.7972880000e + 00
1276505920 1.8141900000e + 00
1276505930楠
1276505940楠
1276505950 0.0000000000e + 00

$SystemStats = (Get-F5.iControl).SystemStatistics  
$report = "c:\snmp\data" + $gObj + ".csv" 

### Allocate a new Query Object and add the inputs needed 
$Query = New-Object -TypeName iControl.SystemStatisticsPerformanceStatisticQuery 
$Query.object_name = $i 
$Query.start_time = $startTime 
$Query.end_time = 0 
$Query.interval = $interval 
$Query.maximum_rows = 0 

### Make method call passing in an array of size one with the specified query 
$ReportData = $SystemStats.get_performance_graph_csv_statistics((,$Query)) 

### Allocate a new encoder and turn the byte array into a string 
$ASCII = New-Object -TypeName System.Text.ASCIIEncoding 
$csvdata = $ASCII.GetString($ReportData[0].statistic_data) 

$csv2 = convertFrom-CSV $csvdata 

$csv2 

Answer 1

有基于.NET的Array类型没有Remove或Split方法，或者通过围绕Array实例PowerShell的包装增加。这很容易显示：

 
PS[64bit] E:\> $a = 1,2,3,4,5 
PS[64bit] E:\> $a.GetType() 

IsPublic IsSerial Name          BaseType 
-------- -------- ----          -------- 
True  True  Object[]         System.Array 


PS[64bit] E:\> Get-Member -InputObject $a 


    TypeName: System.Object[] 

Name   MemberType Definition 
----   ---------- ---------- 
Count   AliasProperty Count = Length 
Address  Method  System.Object&, mscorlib, Version=2.0.0.0, Culture=neutral, PublicK... 
Clone   Method  System.Object Clone() 
CopyTo   Method  System.Void CopyTo(array array, int index), System.Void CopyTo(arra... 
Equals   Method  bool Equals(System.Object obj) 
Get   Method  System.Object Get(int) 
GetEnumerator Method  System.Collections.IEnumerator GetEnumerator() 
GetHashCode Method  int GetHashCode() 
GetLength  Method  int GetLength(int dimension) 
GetLongLength Method  long GetLongLength(int dimension) 
GetLowerBound Method  int GetLowerBound(int dimension) 
GetType  Method  type GetType() 
GetUpperBound Method  int GetUpperBound(int dimension) 
GetValue  Method  System.Object GetValue(Params int[] indices), System.Object GetValu... 
Initialize  Method  System.Void Initialize() 
Set   Method  System.Void Set(int , System.Object) 
SetValue  Method  System.Void SetValue(System.Object value, int index), System.Void S... 
ToString  Method  string ToString() 
IsFixedSize Property  System.Boolean IsFixedSize {get;} 
IsReadOnly  Property  System.Boolean IsReadOnly {get;} 
IsSynchronized Property  System.Boolean IsSynchronized {get;} 
Length   Property  System.Int32 Length {get;} 
LongLength  Property  System.Int64 LongLength {get;} 
Rank   Property  System.Int32 Rank {get;} 

.NET和PowerShell中的数组是固定大小。要删除您需要复制所有，但该元素被删除的元素，在PSH这可以用Where-Object做到：

$newArray = $oldArray | Where-Object {some-condition-on-$_} 

同样Select-Object与-First和-Skip参数可以用来选择之前或之后的元素（resp3ectively ）索引。

---

NBSystem.Array并实现System.Collections.ILst但明确的实施IList.Remove只是抛出一个NotImplementedException。