获取Windows搜索（SystemIndex）的排除扩展名列表

你遇到的EnumerateExcludedExtensions方法未实现的问题是常见情况，以下是几种可行的替代方案：

方法1：读取注册表项 #

Windows搜索的排除扩展名分别存储在机器级和用户级注册表路径中：

• 机器级：HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude
• 用户级：HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude

C#示例代码：

using Microsoft.Win32;
using System;

class Program
{
    static void Main()
    {
        // 读取机器级排除扩展名（需管理员权限）
        using (RegistryKey machineKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude"))
        {
            PrintExcludedExtensions(machineKey, "机器级排除扩展名");
        }

        // 读取用户级排除扩展名
        using (RegistryKey userKey = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude"))
        {
            PrintExcludedExtensions(userKey, "用户级排除扩展名");
        }
    }

    static void PrintExcludedExtensions(RegistryKey key, string label)
    {
        if (key == null)
        {
            Console.WriteLine($"{label}: 未找到对应注册表项");
            return;
        }

        Console.WriteLine($"{label}:");
        foreach (string ext in key.GetValueNames())
        {
            Console.WriteLine($"  {ext}");
        }
    }
}

方法2：通过WMI查询 #

使用Win32_SearchSetting WMI类可以直接获取搜索设置中的排除扩展名列表，C#示例代码：

using System.Management;
using System;

class Program
{
    static void Main()
    {
        try
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(
                "root\\CIMV2", 
                "SELECT ExcludedExtensions FROM Win32_SearchSetting"
            );

            foreach (ManagementObject obj in searcher.Get())
            {
                string[] excludedExts = obj["ExcludedExtensions"] as string[];
                if (excludedExts != null)
                {
                    Console.WriteLine("排除的扩展名列表:");
                    foreach (string ext in excludedExts)
                    {
                        Console.WriteLine($"  {ext}");
                    }
                }
            }
        }
        catch (ManagementException e)
        {
            Console.WriteLine($"WMI查询错误: {e.Message}");
        }
    }
}

方法3：PowerShell命令行方式 #

如果不需要编写C#代码，可直接用PowerShell获取：

# 获取全局排除扩展名
Get-WmiObject -Namespace root\CIMV2 -Class Win32_SearchSetting | Select-Object -ExpandProperty ExcludedExtensions

# 从注册表读取机器级和用户级排除项
Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude" | Get-Member -MemberType NoteProperty | Select-Object -ExpandProperty Name
Get-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows Search\Gathering Manager\ExtensionsToExclude" | Get-Member -MemberType NoteProperty | Select-Object -ExpandProperty Name

内容的提问来源于stack exchange，提问作者Phil G