c#异常读取注册表:空引用异常

本文关键字：异常 引用 注册表 读取 | 更新日期: 2023-09-27 18:10:26

我正在研究一种方法来读取安装在机器上的程序。

public void refreshProgramsFromWindows () {
            string SoftwareKey = "SOFTWARE''Microsoft''Windows''CurrentVersion''Installer''UserData''S-1-5-18''Products";
            RegistryKey rk = default(RegistryKey);
            rk = Registry.LocalMachine.OpenSubKey(SoftwareKey);
            //string skname = null;
            string sname = string.Empty;
            // New list from scratch
            this.installedSoftwareList = new List<software>();
            // Object software info
            software aSoftware = new software();
            foreach (string skname in rk.GetSubKeyNames())
            {
                // Reset software info
                aSoftware.reset();
                try
                {
                    // Name of the programm
                    sname = Registry.LocalMachine.OpenSubKey(SoftwareKey).OpenSubKey(skname).OpenSubKey("InstallProperties").GetValue("DisplayName").ToString();
                    aSoftware.name = sname;
                    // Write program to the list
                    installedSoftwareList.Add(aSoftware);
                }
                catch (Exception ex)
                {
                }
            }

. Net Framework是4.5，我超过Windows 7/8。当我调试这段代码var rk为null时，它在foreach中抛出一个null引用异常。应用程序清单被设置为需要管理员权限，所以注册表是可读的。有什么问题吗?

提前谢谢你。欢呼。

c#异常读取注册表:空引用异常

64位注册表问题:

添加(处理64位注册表):

public static RegistryKey GetRegistryKey()
        {
            return GetRegistryKey(null);
        }
        public static RegistryKey GetRegistryKey(string keyPath)
        {
            RegistryKey localMachineRegistry
                = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
                                          Environment.Is64BitOperatingSystem
                                              ? RegistryView.Registry64
                                              : RegistryView.Registry32);
            return string.IsNullOrEmpty(keyPath)
                ? localMachineRegistry
                : localMachineRegistry.OpenSubKey(keyPath);
        }
        public static object GetRegistryValue(string keyPath, string keyName)
        {
            RegistryKey registry = GetRegistryKey(keyPath);
            return registry.GetValue(keyName);
        }

和改变:

rk = Registry.LocalMachine.OpenSubKey(SoftwareKey);


rk = GetRegistryKey(SoftwareKey);

现在可以了

相关文章：