PowerShell 中的 .NET 跟踪，无需创建 .config 文件 [英] .NET tracing in PowerShell without creating .config file

问题描述

我知道我可以启用 .NET 跟踪 通过添加 element 到 PowerShell 安装文件夹中的应用配置 (powershell.exe.config).这在 PowerShell 中的 System.Net 跟踪中有介绍.

I know I can enable .NET tracing by adding <system.diagnostics> element to App config (powershell.exe.config) in PowerShell installation folder. This is covered in System.Net tracing in PowerShell.

事实上，我也想记录 System.Net 跟踪源(例如 FtpWebRequest).

In fact, I too want to log System.Net tracing source (e.g. FtpWebRequest).

但是有没有办法在本地启用跟踪?就像代码本身一样?或者可能使用一些命令行开关?或者我可以至少将应用配置文件放在 local 文件夹中，而不必修改系统范围的设置?

But is there a way to enable tracing locally? Like in the code itself? Or possibly using some command-line switch? Or can I at least have the App config file in a local folder, not to have to modify the system-wide settings?

推荐答案

只需在代码中(因此在 Powershell 中)启用默认跟踪源(Trace.Information 等)相对容易.

Just enabling the default trace sources (Trace.Information etc.) in code (and therefore in Powershell) is relatively easy.

对 System.Net 跟踪源执行此操作更为复杂，因为它们不可公开访问.

Doing so for the System.Net trace sources is more complicated because they are not publicly accessible.

我以前在 C# 中看到过，调用 System.Net 方法，例如Dns.Resolve 是创建 TraceSource 所必需的，但在 Powershell 中似乎不需要.

I have previously seen that in C#, calling a System.Net method e.g. Dns.Resolve was necessary in order to get the TraceSource to be created but this doesn't seem to be needed in Powershell.

所以不是一个很好的解决方案......但这取决于你的替代方案是什么:

So not a great solution... but it depends what your alternatives are I guess:

$id = [Environment]::TickCount;
$fileName = "${PSScriptRoot}\Powershell_log_${id}.txt"
$listener1 = [System.Diagnostics.TextWriterTraceListener]::New($fileName, "text_listener")
$listener2 = [System.Diagnostics.ConsoleTraceListener]::New()
$listener2.Name = "console_listener"

[System.Diagnostics.Trace]::AutoFlush = $true
[System.Diagnostics.Trace]::Listeners.Add($listener1) | out-null
[System.Diagnostics.Trace]::Listeners.Add($listener2) | out-null

# Use reflection to enable and hook up the TraceSource
$logging = [System.Net.Sockets.Socket].Assembly.GetType("System.Net.Logging")
$flags = [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Static
$logging.GetField("s_LoggingEnabled", $flags).SetValue($null, $true)
$webTracing = $logging.GetProperty("Web", $flags);
$webTraceSource = [System.Diagnostics.Tracesource]$webTracing.GetValue($null, $null);
$webTraceSource.Switch.Level = [System.Diagnostics.SourceLevels]::Information
$webTracesource.Listeners.Add($listener1) | out-null
$webTracesource.Listeners.Add($listener2)  | out-null

[System.Diagnostics.Trace]::TraceInformation("About to do net stuff");
[System.Net.FtpWebRequest]::Create("ftp://www.google.com") | out-null
[System.Diagnostics.Trace]::TraceInformation("Finished doing net stuff");

#get rid of the listeners
[System.Diagnostics.Trace]::Listeners.Clear();
$webTraceSource.Listeners.Clear();
$listener1.Dispose();
$listener2.Dispose();

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