从C＃调用PowerShell命令 [英] Invoking powershell cmdlets from C#

问题描述

我想学习如何调用从C＃PS的cmdlet，以及所遇到的PowerShell的类。它工作正常的基本使用，但现在我想执行这个PS命令：

I'm trying to learn how to call PS cmdlets from C#, and have come across the PowerShell class. It works fine for basic use, but now I wanted to execute this PS command:

Get-ChildItem | where {$_.Length -gt 1000000}

我试图通过PowerShell的类建筑，但我似乎无法做到这一点。这是我的code迄今：

I tried building this through the powershell class, but I can't seem to do this. This is my code so far:

PowerShell ps = PowerShell.Create();
ps.AddCommand("Get-ChildItem");
ps.AddCommand("where-object");
ps.AddParameter("Length");
ps.AddParameter("-gt");
ps.AddParameter("10000");


// Call the PowerShell.Invoke() method to run the 
// commands of the pipeline.
foreach (PSObject result in ps.Invoke())
{
    Console.WriteLine(
        "{0,-24}{1}",
        result.Members["Length"].Value,
        result.Members["Name"].Value);
} // End foreach.

当我运行这个

我总是得到一个异常。是否有可能像这样运行在哪里对象cmdlet？

I always get an exception when I run this. Is it possible to run the Where-Object cmdlet like this?

推荐答案

长度， -gt 和 10000 不是参数为位置对象。只有一个参数， FilterScript 在位置0，与类型的值脚本块其中包含的前pression 的。

Length, -gt and 10000 are not parameters to Where-Object. There is only one parameter, FilterScript at position 0, with a value of type ScriptBlock which contains an expression.

PowerShell ps = PowerShell.Create();
ps.AddCommand("Get-ChildItem");
ps.AddCommand("where-object");
ScriptBlock filter = ScriptBlock.Create("$_.Length -gt 10000")
ps.AddParameter("FilterScript", filter)

如果您有需要分解更复杂的语句，可以考虑使用标记生成器（在2版或更高版本提供）了解结构较好：

If you have more complex statements that you need to decompose, consider using the tokenizer (available in v2 or later) to understand the structure better:

    # use single quotes to allow $_ inside string
PS> $script = 'Get-ChildItem | where-object -filter {$_.Length -gt 1000000 }'
PS> $parser = [System.Management.Automation.PSParser]
PS> $parser::Tokenize($script, [ref]$null) | select content, type | ft -auto

这转储以下信息。这不是富比在V3的AST解析器，但它仍然是有用的：

This dumps out the following information. It's not as rich as the AST parser in v3, but it's still useful:

    Content                   Type
    -------                   ----
    Get-ChildItem          Command
    |                     Operator
    where-object           Command
    -filter       CommandParameter
    {                   GroupStart
    _                     Variable
    .                     Operator
    Length                  Member
    -gt                   Operator
    1000000                 Number
    }                     GroupEnd

希望这有助于。

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