获取常用系统文件目录

static void Main(string[] args)
{
    //1、通过Environment.GetFolderPath()获取

    string pathFavorites = Environment.GetFolderPath(Environment.SpecialFolder.Favorites);//获取我的收藏路径
    Console.WriteLine("Favorites:" + pathFavorites);
    string pathDesktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);//获取桌面路径
    Console.WriteLine("Desktop:" + pathDesktop);
    string pathMyDocuments = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);//获取我的文档路径
    Console.WriteLine("MyDocuments:" + pathMyDocuments);
    string pathMyPictures = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);//获取我的图片路径
    Console.WriteLine("MyPictures:" + pathMyPictures);
    string pathMyVideos = Environment.GetFolderPath(Environment.SpecialFolder.MyVideos);//获取我的视频路径
    Console.WriteLine("MyVideos:" + pathMyVideos);
    string pathDownloads = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + "\\Downloads";//获取下载路径（这个没有找到，所以需要配合UserProfile来拼接了）
    Console.WriteLine("Downloads:" + pathDownloads);
    //2、通过环境变量获取
    string tempPath = Environment.GetEnvironmentVariable("TEMP");
    Console.WriteLine("TEMP:" + tempPath);

    Console.ReadKey();
}

设置开机启动

private string registryName = "BootTestDemo";//启动项的名称

private void btnSubmit_Click(object sender, EventArgs e)
{
    if (this.ckBootEntry.Checked)
    {
        string filePath = Environment.CurrentDirectory + "\\PowerBootDemo.exe";
        SetBoot(this.registryName, filePath);
    }
    else
    {
        DeleteBoot(this.registryName);
    }
    MessageBox.Show("Success");
}

/// <summary>
/// 检测注册项是否存在
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
private bool CheckExisting(string key)
{
    string[] allNames = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run").GetValueNames();
    foreach (var item in allNames)
    {
        if (item.Equals(key))
        {
            return true;
        }
    }
    return false;
}
/// <summary>
/// 设置启动项
/// </summary>
private void SetBoot(string key, string path)
{
    if (CheckExisting(this.registryName)) return;//检测是否存在
    Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run");//在系统启动的注册表中创建子项
    registryKey.SetValue(key, path);//为子项进行赋值
}
/// <summary>
/// 删除启动项
/// </summary>
public void DeleteBoot(string key)
{
    if (!CheckExisting(this.registryName)) return;//检测是否存在
    Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run");
    registryKey.DeleteValue(key, false);
}

//PS：如果记不住这么长的路径可以直接打开系统注册表编辑器来翻看（cmd执行：regedit）。

持续更新….