Csharp 刷新 Windows 资源管理器窗口(无法让内联 C# 代码在 PowerShell 函数中正常运行)

我正试图在PowerShell中运行一些内联C#代码，目的是刷新Windows资源管理器.

以下是代码(基于this question):

function Request-ExplorerRefresh {

$code = @"
using System;
namespace VSYSRefresh
{
    public static class Util
    {

        public static void RefreshExplorer(){

            Console.WriteLine("Refreshing Explorer");
            
            Guid CLSID_ShellApplication = new Guid("13709620-C279-11CE-A49E-444553540000");
            Type shellApplicationType = Type.GetTypeFromCLSID(CLSID_ShellApplication, true);

            object shellApplication = Activator.CreateInstance(shellApplicationType);
            object windows = shellApplicationType.InvokeMember("Windows", System.Reflection.BindingFlags.InvokeMethod, null, shellApplication, new object[] { });

            Type windowsType = windows.GetType();
            object count = windowsType.InvokeMember("Count", System.Reflection.BindingFlags.GetProperty, null, windows, null);
            for (int i = 0; i < (int)count; i++)
            {
                object item = windowsType.InvokeMember("Item", System.Reflection.BindingFlags.InvokeMethod, null, windows, new object[] { i });
                if(item != null){
                    Type itemType = item.GetType();
                }
                // only refresh windows explorer
                string itemName = (string)itemType.InvokeMember("Name", System.Reflection.BindingFlags.GetProperty, null, item, null);
                if ((itemName == "Windows Explorer") || (itemName == "File Explorer")) {
                    itemType.InvokeMember("Refresh", System.Reflection.BindingFlags.InvokeMethod, null, item, null);
                }
            }
        }
    }
}
"@
    Add-Type -TypeDefinition $code -Language CSharp
    Invoke-Expression "[VSYSRefresh.Util]::RefreshExplorer()"

}

我收到以下错误:

(26,43): error CS0165: Use of unassigned local variable 'itemType'
(string)itemType.InvokeMember("Name", System.Reflection.BindingFlags.GetProperty, null, item, null);

Cannot add type. Compilation errors occurred.

Unable to find type [VSYSRefresh.Util].

我甚至都不能让Console.WriteLine()美元go 工作.我是否需要引用某些程序集才能使其正常工作？

我走进了死胡同，任何帮助都将不胜感激.