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C#操作注册表简单教程(附带操作某数据库客户端注册表以实现重置试用期的效果)

前言：

使用Windows系统，经常会遇到需要做注册表的操作。例如，一些软件需要修改注册表、自己编写的软件需要新建注册表进行写入注册信息等等。以下内容以某常见的数据库操作客户端为例，做一个注册表操作的学习。

1、例如，找一个已经注册表过期的软件，记录一下时间和当前过期的效果。

2、参考C#操作注册表官方文档:

https://learn.microsoft.com/zh-cn/dotnet/api/microsoft.win32.registrykey?redirectedfrom=MSDN&view=net-6.0

3、官方示例代码：

using System;
using System.Security.Permissions;
using Microsoft.Win32;

class RegKey
{
    static void Main()
    {
        // Create a subkey named Test9999 under HKEY_CURRENT_USER.
        RegistryKey test9999 =
            Registry.CurrentUser.CreateSubKey("Test9999");
        // Create two subkeys under HKEY_CURRENT_USER\Test9999. The
        // keys are disposed when execution exits the using statement.
        using(RegistryKey
            testName = test9999.CreateSubKey("TestName"),
            testSettings = test9999.CreateSubKey("TestSettings"))
        {
            // Create data for the TestSettings subkey.
            testSettings.SetValue("Language", "French");
            testSettings.SetValue("Level", "Intermediate");
            testSettings.SetValue("ID", 123);
        }

        // Print the information from the Test9999 subkey.
        Console.WriteLine("There are {0} subkeys under {1}.",
            test9999.SubKeyCount.ToString(), test9999.Name);
        foreach(string subKeyName in test9999.GetSubKeyNames())
        {
            using(RegistryKey
                tempKey = test9999.OpenSubKey(subKeyName))
            {
                Console.WriteLine("\nThere are {0} values for {1}.",
                    tempKey.ValueCount.ToString(), tempKey.Name);
                foreach(string valueName in tempKey.GetValueNames())
                {
                    Console.WriteLine("{0,-8}: {1}", valueName,
                        tempKey.GetValue(valueName).ToString());
                }
            }
        }

        using(RegistryKey
            testSettings = test9999.OpenSubKey("TestSettings", true))
        {
            // Delete the ID value.
            testSettings.DeleteValue("id");

            // Verify the deletion.
            Console.WriteLine((string)testSettings.GetValue(
                "id", "ID not found."));
        }

        // Delete or close the new subkey.
        Console.Write("\nDelete newly created registry key? (Y/N) ");
        if(Char.ToUpper(Convert.ToChar(Console.Read())) == 'Y')
        {
            Registry.CurrentUser.DeleteSubKeyTree("Test9999");
            Console.WriteLine("\nRegistry key {0} deleted.",
                test9999.Name);
        }
        else
        {
            Console.WriteLine("\nRegistry key {0} closed.",
                test9999.ToString());
            test9999.Close();
        }
    }
}

4、做一个测试清理Navicat注册表的demo，当作学习使用。

核心代码：

RegistryKey regKey = Registry.CurrentUser;

RegistryKey regKey2 = regKey.OpenSubKey(@"Software\Classes\CLSID",true);
    string[] keyNameColl;
    keyNameColl = regKey2.GetSubKeyNames();
    List<string> keyNames = new List<string>();
    foreach (string key in keyNameColl) { 
        var subKeys = regKey2.OpenSubKey(key,true);
        var subKeyNames = subKeys.GetSubKeyNames();
        if(subKeyNames!=null && subKeyNames.Length==1 && subKeyNames[0] == "Info")
        {
            keyNames.Add(key);
        }
        subKeys?.Close();
    }
    foreach (var key in keyNames) {
        regKey2.DeleteSubKeyTree(key,false);
        Console.WriteLine($"[HKEY_CURRENT_USER\\Software\\Classes\\CLSID\\{key}]");
    }
    regKey2.Close();
    regKey.Close();