使用[Console] :: ReadLine（）时，不会接收到管道到PowerShell.exe的文本。 [英] Text piped to PowerShell.exe isn't received when using [Console]::ReadLine()

问题描述

当调用.NET [Console] :: ReadLine（）时，会读取PowerShell.exe的管道输入，导致数据丢失。在CMD中，运行：

 
> ping localhost | powershell -NonInteractive -NoProfile -Cdo {$ line = [Console] :: ReadLine（）;（''+（Get-Date -f'HH：mm 
：ss'）+ $ line） -Host;} while（$ line -n​​e $ null）
 23：56：45time <1ms 
 23:56:45 
 23：56：46time< 1ms 
 23 ：56：46 
 23：56：47time< 1ms 
 23:56:47 
 23:56:47 
 

正常情况下，从Vista64ping localhost看起来像这样，所以上面的输出中缺少很多数据：

 
 
 Pinging WORLNTEC02.bnysecurities.corp.local [:: 1] from :: 1 with 32 bytes of data：
回复:: 1：time< 1ms 
回复:: 1 ：time< 1ms 
从:: 1回复::时间< 1ms 
从:: 1回复时间< 1ms 
 
 Ping统计信息为:: 1：
 ：Sent = 4，Received = 4，Lost = 0（0％loss），
大约往返时间，单位为毫秒：
最小= 0ms，最大= 0ms，平均= 0ms 
 

但是从C＃使用相同的API接收发送到该进程的所有数据（不包括一些换行符差异）。代码：

 命名空间ConOutTime {
 class Program {
 static void Main（string [] args）{ 
 string s; 
 while（（s = Console.ReadLine（））！= null）{
 if（s.Length> 0）//不为空行写时间
 Console.WriteLine （{0：HH：mm：ss} {1}，DateTime.Now，s）; 
} 
} 
} 
} 
  

：

 
 00:44:30从32位数据中读取:: 1中的WORLNTEC02.bnysecurities.corp.local [:: 1] ：
 00:44:30回复:: 1：时间< 1ms 
 00:44:31回复:: 1：时间< 1ms 
 00:44:32回复从:: 1：时间<1ms 
 00:44:33回复:: 1：时间< 1ms 
 00:44:33 Ping统计为:: 1：
 00:44:33数据包：发送= 4，接收= 4，丢失= 0（0％损失），
 00:44:33大约往返时间以毫秒为单位：
 00:44:33最小= 0ms， 0ms，Average = 0ms 
 

因此，如果从PowerShell中调用相同的API而不是C＃，StdIn的许多部分都会被'eaten'。是PowerShell主机从StdIn读取字符串，即使我没有使用'PowerShell.exe -Command - '？

解决方案

可以使用PowerShell中的 $ input 枚举器来访问管道传入程序的数据。我也发现 [Console] :: ReadLine（）不知所措。未知的原因。

  C：\Users\Me> ping localhost | powershell -noninteractive -noprofile -c$ input |％{（date -f HH：mm：ss）+''+ $ _}
 
 07:31:54 
 07： 31:54 Pinging Sigmund [:: 1] with 32 bytes of data：
 07:31:54 Reply from :: 1：time< 1ms 
 07:31:54回复from 1：time< ; 1ms 
 07:31:54回复:: 1：时间< 1ms 
 07:31:55回复:: 1：时间< 1ms 
 07:31:55 
 07:31:55 Ping统计信息:: 1：
 07:31:55数据包：Sent = 4，Received = 4，Lost = 0（0％loss），
 07:31:55近似往返时间（毫秒）：
 07:31:55最小值= 0ms，最大值= 0ms，平均值= 0ms 
 
 C：\Users\Me> ping localhost 
 
 Pinging Sigmund [:: 1] with 32 bytes of data：
回复:: 1：time< 1ms 
回复:: 1：time< 1ms 
从:: 1：时间< 1ms 
从:: 1回复时间< 1ms 
 
 Ping统计信息:: 1：
数据包：Sent = 4，Received = Lost = 0（0％loss），
大约往返时间（毫秒）：
最小值= 0ms，最大值= 0ms，平均值= 0ms 
  pre> 
I'm getting itermittent data loss when calling .NET [Console]::ReadLine() to read piped input to PowerShell.exe. In CMD, run:
>ping localhost | powershell -NonInteractive -NoProfile -C "do {$line = [Console]::ReadLine(); ('' + (Get-Date -f 'HH:mm
:ss') + $line) | Write-Host; } while ($line -ne $null)"
23:56:45time<1ms
23:56:45
23:56:46time<1ms
23:56:46
23:56:47time<1ms
23:56:47
23:56:47
Normally 'ping localhost' from Vista64 looks like this, so there is a lot of data missing from the output above:

Pinging WORLNTEC02.bnysecurities.corp.local [::1] from ::1 with 32 bytes of data:
Reply from ::1: time<1ms 
Reply from ::1: time<1ms 
Reply from ::1: time<1ms 
Reply from ::1: time<1ms 

Ping statistics for ::1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
But using the same API from C# receives all the data sent to the process (excluding some newline differences).  Code:
namespace ConOutTime {
    class Program {
        static void Main (string[] args) {
            string s;
            while ((s = Console.ReadLine ()) != null) {
                if (s.Length > 0) // don't write time for empty lines
                    Console.WriteLine("{0:HH:mm:ss} {1}", DateTime.Now, s);
            } 
        }
    }
}
Output:
00:44:30 Pinging WORLNTEC02.bnysecurities.corp.local [::1] from ::1 with 32 bytes of data:
00:44:30 Reply from ::1: time<1ms
00:44:31 Reply from ::1: time<1ms
00:44:32 Reply from ::1: time<1ms
00:44:33 Reply from ::1: time<1ms
00:44:33 Ping statistics for ::1:
00:44:33     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
00:44:33 Approximate round trip times in milli-seconds:
00:44:33     Minimum = 0ms, Maximum = 0ms, Average = 0ms
So, if calling the same API from PowerShell instead of C# many parts of StdIn get 'eaten'.  Is the PowerShell host reading string from StdIn even though I didn't use 'PowerShell.exe -Command -'?
解决方案
You can use the $input enumerator in PowerShell to get access to data piped into the program. I also have found that [Console]::ReadLine() somehow does little to nothing. Unknown reasons for that, though.
C:\Users\Me> ping localhost | powershell -noninteractive -noprofile -c "$input|%{(date -f HH:mm:ss)+' '+$_}"

07:31:54
07:31:54 Pinging Sigmund [::1] with 32 bytes of data:
07:31:54 Reply from ::1: time<1ms
07:31:54 Reply from ::1: time<1ms
07:31:54 Reply from ::1: time<1ms
07:31:55 Reply from ::1: time<1ms
07:31:55
07:31:55 Ping statistics for ::1:
07:31:55     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
07:31:55 Approximate round trip times in milli-seconds:
07:31:55     Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Users\Me>ping localhost

Pinging Sigmund [::1] with 32 bytes of data:
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms

Ping statistics for ::1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms


                        
这篇关于使用[Console] :: ReadLine（）时，不会接收到管道到PowerShell.exe的文本。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！