如何在 C# 中发现 PowerShell 脚本参数 [英] How to discover PowerShell Script parameters in c#

问题描述

我们希望在数据库中存储和管理 PowerShell 脚本，并通过 C# 执行它们.我们如何在执行之前发现这样一个脚本的参数?因此我们可以将它们设置为已知值或提示用户输入值.

We want to store and manage PowerShell scripts in a database an execute them via C#. How can we discover the parameters of such a script before executing it? so we can set them to known values or prompt a user for values.

一些说明:

我们创建了一个管理系统 MS.

We create a management system MS.

1. 管理员将 PowerShell 脚本存储在 MS 数据库中.
2. 后来另一个管理员从 MS 提供的列表中选择了这个脚本.
3. MS 发现脚本的参数.
4. MS 提示管理员输入值.

5. MS 使用提供的参数执行脚本.

1. An admin stores a PowerShell script in the MS database.
2. Later a different admin selects this script from a list offered by the MS.
3. MS discovers the parameters of the script.
4. MS prompts the admin for values.

5. MS executes the script with the parameters supplied.

    string testScript = @"
        {
            param(
                [ValidateNotNullOrEmpty()]
                [string]$Name
            )
            get-process $name
        ";

Dictionary<string,object> DiscoverParameters()
{
    using (PowerShell psi = PowerShell.Create())
    {
        psi.AddScript(testScript);
        var pars = new Dictionary<string,object>();
        //How do we get at the parameters
        return pars;
    }
}

void ExecuteScript(Dictionary<string,object> pars)
{
    using (PowerShell psi = PowerShell.Create())
    {
        psi.AddScript(testScript);
        pars.ToList().ForEach(p => psi.AddParameter(p.Key, p.Value));
        Collection<PSObject> PSOutput = psi.Invoke();
        //...
    }
}

推荐答案

mjolinor 是正确的，使用 PowerShell 解析器可能是获取参数的最佳方式.该示例在 PowerShell 中，下面是在 C# 中的示例.我不太确定你在寻找什么，参数是 Dictionary.在这里，我们只是将名称粘贴到列表中，尽管您可以提取其他信息，例如静态类型.

mjolinor is correct that using the PowerShell parser is probably the best way to get the parameters. That example is in PowerShell, below is an example in C#. I'm not quite sure what you are looking for with the parameters being Dictionary<string, object>. Here we just stick the names into the list although there is other info you could pull out like the static type.

using System.Management.Automation;
using System.Management.Automation.Language;

static void Main(string[] args)
{
    const string testScript = @"
    param(
        [ValidateNotNullOrEmpty()]
        [string]$Name
    )
    get-process $name
";
    foreach(var parameter in GetScriptParameters(testScript))
    {
        Console.WriteLine(parameter);
    }
}

private static List<string> GetScriptParameters(string script)
{
    Token[] tokens;
    ParseError[] errors;
    var ast = Parser.ParseInput(script, out tokens, out errors);
    if (errors.Length != 0)
    {
        Console.WriteLine("Errors: {0}", errors.Length);
        foreach (var error in errors)
        {
            Console.WriteLine(error);
        }
        return null;
    }

    return ast.ParamBlock.Parameters.Select(p => p.Name.ToString()).ToList();
}

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