.net - 在 Powershell 中使用 .NET 属性

Question

我正在尝试使用 Test-NetConnection 测量延迟。我已经让它与测试连接很好地配合使用，但它并非在所有地方都可用。

这是我对测试连接所做的操作:

PS:>Test-Connection 8.8.8.8 -count 1 | select ResponseTime

ResponseTime
------------
28

Test-NetConnection 确实返回包含延迟的属性。

PS:>Test-NetConnection 8.8.8.8

ComputerName           : 8.8.8.8
RemoteAddress          : 8.8.8.8
InterfaceAlias         : eth0
SourceAddress          : REMOVED
PingSucceeded          : True
PingReplyDetails (RTT) : 28 ms

但是当我尝试引用此属性时，我没有得到该值。

PS:>Test-NetConnection 8.8.8.8 | select PingReplyDetails

PingReplyDetails
----------------
System.Net.NetworkInformation.PingReply

如何从命令中获取实际值？

Answer 1

问题是，PingReplyDetails (RTT) 不是真正的属性，正如您通过以下命令及其输出看到的那样，其中缺少此“属性”。

PS > Test-NetConnection SomeHost | Get-Member


   TypeName: TestNetConnectionResult

Name                     MemberType Definition                                               
----                     ---------- ----------                                               
Equals                   Method     bool Equals(System.Object obj)                           
GetHashCode              Method     int GetHashCode()                                        
GetType                  Method     type GetType()                                           
ToString                 Method     string ToString()                                        
AllNameResolutionResults Property   System.Object AllNameResolutionResults {get;set;}        
BasicNameResolution      Property   System.Object BasicNameResolution {get;set;}             
ComputerName             Property   string ComputerName {get;set;}                           
Detailed                 Property   bool Detailed {get;set;}                                 
DNSOnlyRecords           Property   System.Object DNSOnlyRecords {get;set;}                  
InterfaceAlias           Property   string InterfaceAlias {get;set;}                         
InterfaceDescription     Property   string InterfaceDescription {get;set;}                   
InterfaceIndex           Property   uint32 InterfaceIndex {get;set;}                         
IsAdmin                  Property   bool IsAdmin {get;set;}                                  
LLMNRNetbiosRecords      Property   System.Object LLMNRNetbiosRecords {get;set;}             
MatchingIPsecRules       Property   ciminstance[] MatchingIPsecRules {get;set;}              
NameResolutionSucceeded  Property   bool NameResolutionSucceeded {get;set;}                  
NetAdapter               Property   ciminstance NetAdapter {get;set;}                        
NetRoute                 Property   ciminstance NetRoute {get;set;}                          
NetworkIsolationContext  Property   string NetworkIsolationContext {get;set;}                
PingReplyDetails         Property   System.Net.NetworkInformation.PingReply PingReplyDetai...
PingSucceeded            Property   bool PingSucceeded {get;set;}                            
RemoteAddress            Property   ipaddress RemoteAddress {get;set;}                       
RemotePort               Property   uint32 RemotePort {get;set;}                             
SourceAddress            Property   ciminstance SourceAddress {get;set;}                     
TcpClientSocket          Property   System.Net.Sockets.Socket TcpClientSocket {get;set;}     
TcpTestSucceeded         Property   bool TcpTestSucceeded {get;set;}                         
TraceRoute               Property   string[] TraceRoute {get;set;}    

事实证明，它只是一种为此 Cmdlet 的结果类型(如上所示的 TestNetConnectionResult)定义的格式化糖。可以通过以下命令检索格式描述:

Get-FormatData TestNetConnectionResult | `
Select -ExpandProperty FormatViewDefinition | ? Name -eq DefaultView | `
Select -ExpandProperty Control | `
Select -ExpandProperty Entries | `
Select -ExpandProperty Items | ? Label -eq "PingReplyDetails (RTT)" | `
Select -ExpandProperty DisplayEntry | `
Select -ExpandProperty Value

返回

$_.PingReplyDetails.RoundTripTime.ToString() + " ms";

有了这些信息，您也可以执行相同的操作，例如具有以下内容:

Test-NetConnection 8.8.8.8 | Select @{N = "PingReplyDetails (RTT)"; E = {$_.PingReplyDetails.RoundTripTime.ToString() + " ms"}}