C#拒绝访问删除注册表值 [英] C# Denied Access Deleting Registry Value

问题描述

当尝试创建一个 RunOnStartup 函数来检查天气或键是否存在时，如果存在，用户是否希望将其删除，我遇到了拒绝访问的问题.更具体地说是这个.

When attempting to create a RunOnStartup Function that checks weather or not a key exists and if it does, does the user want it deleted, I encounter the problem of Access Denied. More specifically this.

System.UnauthorizedAccessException: 'Cannot write to the registry key.'

我的代码在这里.

private static void RunOnStartup()
    {
        string KeyName = @"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run";
        string valueName = "MyApp";
        if (Registry.GetValue(KeyName, valueName, null) == null)
        {
            RegistryKey reg = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);
            reg.SetValue("MyApp", Application.ExecutablePath.ToString());
            MessageBox.Show("The Program will now start on startup", "Startup");
        }
        else
        {
            DialogResult dialogResult = MessageBox.Show("This Program can already run on Start up. Do you want it to no longer do so?", "Start Up", MessageBoxButtons.YesNoCancel);
            if(dialogResult == DialogResult.Yes)
            {
                Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run").DeleteValue("MyApp");
            }
            else if(dialogResult == DialogResult.No)
            {
                MessageBox.Show("The Program will continue to run on Startup", "Startup", MessageBoxButtons.OK);
            }
            else if(dialogResult == DialogResult.Cancel)
            {
                //Do Nothing
            }
        }
    }

我可以创建密钥，只是不删除它，很奇怪.也许我缺少一个权限，我试图以管理模式运行，但发生了同样的事情.

I can create the key, Just not delete it, quite strange. Perhaps there is a permission I'm missing, I attempted to run in administrative mode but the same thing happened.

推荐答案

代码中有两个错误:

• 异常 UnauthorizedAccessException - 'Cannot Write to the registry key' 表示您没有打开 writableRegistryKey> 模式.相反，您应该在尝试删除之前以写入模式打开它.确保将 true 作为第二个参数传递，如下所示:

• The exception UnauthorizedAccessException - 'Cannot Write to the registry key' indicates that the you didn't open the RegistryKey in writable mode. Instead you should open it in write mode before trying to delete. Make sure you pass true as the second argument, like this:

RegistryKey reg = Registry.CurrentUser.OpenSubKey("SOFTWARE\\..", true);
reg.DeleteValue("MyApp");

最初您的 KeyName 和 if 条件检查在 HKEY_LOCAL_MACHINE 而您的插入/删除稍后参考 HKEY_CURRENT_USER 使用 Registry.CurrentUser 所以你应该让它们保持一致.

Also initially your KeyName and if condition check in HKEY_LOCAL_MACHINE whereas your insertion/deletion later refer to HKEY_CURRENT_USER using Registry.CurrentUser so you should probably make them consistent.

string KeyName = @"HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run";

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