.NET使用P/Invoke来实现注册表的增、删、改、查功能

注册表可以用来进行存储一些程序的信息，例如用户的权限、或者某些值等，可以根据个人需要进行存储和删减。

当前注册表主目录：

引用包 Wesky.Net.OpenTools 1.0.5或者以上版本

操作演示：

创建注册表项

设置注册表值

读取注册表值

删除注册表值

删除注册表项

操作演示代码

IRegistryManager registryManager = new RegistryManager();

// 创建注册表项
// registryManager.CreateKey(RegistryRoot.CurrentUser, @"Wesky\MyApp");

// 设置注册表值
// registryManager.SetValue(RegistryRoot.CurrentUser, @"Wesky\MyApp", "MyValue", "Hello, Registry!");

// 读取注册表值
// var value = registryManager.GetValue(RegistryRoot.CurrentUser, @"Wesky\MyApp", "MyValue");
// Console.WriteLine($"读取到的注册表值:{value}");

// 删除注册表值
// registryManager.DeleteValue(RegistryRoot.CurrentUser, @"Wesky\MyApp", "MyValue");

// 删除注册表项
registryManager.DeleteKey(RegistryRoot.CurrentUser, @"Wesky\MyApp");
Console.WriteLine("Over");
Console.ReadKey();

核心包内源码：

 [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegCreateKeyEx(
        IntPtr hKey,
        string lpSubKey,
        int Reserved,
        string lpClass,
        int dwOptions,
        int samDesired,
        IntPtr lpSecurityAttributes,
        out IntPtr phkResult,
        out int lpdwDisposition);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegOpenKeyEx(
        IntPtr hKey,
        string lpSubKey,
        int ulOptions,
        int samDesired,
        out IntPtr phkResult);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegCloseKey(IntPtr hKey);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegSetValueEx(
        IntPtr hKey,
        string lpValueName,
        int Reserved,
        int dwType,
        byte[] lpData,
        int cbData);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegGetValue(
        IntPtr hKey,
        string lpSubKey,
        string lpValue,
        int dwFlags,
        out int pdwType,
        StringBuilder pvData,
        ref int pcbData);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegDeleteKey(IntPtr hKey, string lpSubKey);

    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
    private static extern int RegDeleteValue(IntPtr hKey, string lpValueName);

    /// <summary>
    /// 获取注册表根键
    /// Get registry root key
    /// </summary>
    /// <param name="root"></param>
    /// <returns></returns>
    /// <exception cref="ArgumentOutOfRangeException"></exception>
    private IntPtr GetRegistryRootKey(RegistryRoot root)
    {
        switch (root)
        {
            case RegistryRoot.ClassesRoot:
                return HKEY_CLASSES_ROOT;
            case RegistryRoot.CurrentUser:
                return HKEY_CURRENT_USER;
            case RegistryRoot.LocalMachine:
                return HKEY_LOCAL_MACHINE;
            case RegistryRoot.Users:
                return HKEY_USERS;
            case RegistryRoot.CurrentConfig:
                return HKEY_CURRENT_CONFIG;
            default:
                throw new ArgumentOutOfRangeException(nameof(root), root, null);
        }
    }

    /// <summary>
    /// 创建注册表键
    /// Create registry key
    /// </summary>
    /// <param name="root"></param>
    /// <param name="subKey"></param>
    /// <exception cref="Exception"></exception>
    public void CreateKey(RegistryRoot root, string subKey)
    {
        IntPtr hKey = GetRegistryRootKey(root);
        int result = RegCreateKeyEx(hKey, subKey, 0, null, REG_OPTION_NON_VOLATILE, KEY_WRITE, IntPtr.Zero, out IntPtr phkResult, out _);

        if (result != ERROR_SUCCESS)
        {
            throw new Exception("创建注册表key失败。 Failed to create registry key.");
        }

        RegCloseKey(phkResult);
    }

    /// <summary>
    /// 删除注册表键
    /// Delete registry key
    /// </summary>
    /// <param name="root"></param>
    /// <param name="subKey"></param>
    /// <exception cref="Exception"></exception>
    public void DeleteKey(RegistryRoot root, string subKey)
    {
        IntPtr hKey = GetRegistryRootKey(root);
        int result = RegDeleteKey(hKey, subKey);

        if (result != ERROR_SUCCESS)
        {
            throw new Exception("删除注册表key失败。Failed to delete registry key.");
        }
    }

    /// <summary>
    /// 设置注册表值
    /// Set registry value
    /// </summary>
    /// <param name="root"></param>
    /// <param name="subKey"></param>
    /// <param name="valueName"></param>
    /// <param name="value"></param>
    /// <exception cref="Exception"></exception>
    public void SetValue(RegistryRoot root, string subKey, string valueName, string value)
    {
        IntPtr hKey = GetRegistryRootKey(root);

        int result = RegOpenKeyEx(hKey, subKey, 0, KEY_WRITE, out IntPtr phkResult);
        if (result != ERROR_SUCCESS)
        {
            throw new Exception("打开注册表key失败。Failed to open registry key.");
        }

        byte[] data = Encoding.Unicode.GetBytes(value);
        result = RegSetValueEx(phkResult, valueName, 0, REG_SZ, data, data.Length);

        if (result != ERROR_SUCCESS)
        {
            throw new Exception("设置注册表值失败。Failed to set registry value.");
        }

        RegCloseKey(phkResult);
    }

    /// <summary>
    /// 获取注册表值
    /// Get registry value
    /// </summary>
    /// <param name="root"></param>
    /// <param name="subKey"></param>
    /// <param name="valueName"></param>
    /// <returns></returns>
    /// <exception cref="Exception"></exception>
    public string GetValue(RegistryRoot root, string subKey, string valueName)
    {
        IntPtr hKey = GetRegistryRootKey(root);

        int result = RegOpenKeyEx(hKey, subKey, 0, KEY_READ, out IntPtr phkResult);
        if (result != ERROR_SUCCESS)
        {
            throw new Exception("打开注册表key失败。Failed to open registry key.");
        }

        int type = 0;
        int size = 1024;
        StringBuilder data = new StringBuilder(size);

        result = RegGetValue(phkResult, null, valueName, RRF_RT_REG_SZ, out type, data, ref size);

        if (result != ERROR_SUCCESS)
        {
            throw new Exception("获取注册表的值失败。Failed to get registry value.");
        }

        RegCloseKey(phkResult);

        return data.ToString();
    }

    /// <summary>
    /// 删除注册表值
    /// Delete registry value
    /// </summary>
    /// <param name="root"></param>
    /// <param name="subKey"></param>
    /// <param name="valueName"></param>
    /// <exception cref="Exception"></exception>
    public void DeleteValue(RegistryRoot root, string subKey, string valueName)
    {
        IntPtr hKey = GetRegistryRootKey(root);

        int result = RegOpenKeyEx(hKey, subKey, 0, KEY_WRITE, out IntPtr phkResult);
        if (result != ERROR_SUCCESS)
        {
            throw new Exception("打开注册表key失败。Failed to open registry key.");
        }

        result = RegDeleteValue(phkResult, valueName);

        if (result != ERROR_SUCCESS)
        {
            throw new Exception("删除注册表的值失败。Failed to delete registry value.");
        }

        RegCloseKey(phkResult);
    }

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