CODEWITHSUNDEEP
c#
Styler2go
Styler2go

Reputation: 603

NullReferenceException at RegistryKey

I want to read from Registry and set some Values, but i keep getting NullReferenceExceptions.

public partial class Form1 : Form
{

    RegistryKey rkApp = null;
    RegistryKey settings = null;

    public Form1()
    {
        InitializeComponent();

        rkApp = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);
        settings = Registry.CurrentUser.OpenSubKey("HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Shit", true);

        if (settings.GetValue("automove") != null)
        {
            automove = true;
            autostartToolStripMenuItem.Checked = true;
        }
    }
}

i deleted some unrelevant code in this example but this is my code... Any Ideas?

The error appears in line if (settings.GetValue("automove") != null)

Upvotes: 2

Views: 3736

Answers (2)

Styler2go
Styler2go

Reputation: 603

I fixed it this way:

First, i checked if settings is null. If settings is null then i create the SubKey first. After this, i re-set the settings variable and evrything is fine.

settings = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Shit", true);
if (settings == null)
{
    Registry.CurrentUser.CreateSubKey("SOFTWARE\\Shit").Flush();
    settings = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Shit", true);
}

Upvotes: 0

Richard Deeming
Richard Deeming

Reputation: 31198

Registry.CurrentUser.OpenSubKey("HKEY_LOCAL_MACHINE\\...

The HKEY_CURRENT_USER hive doesn't contain a key whose name starts with HKEY_LOCAL_MACHINE. If you're trying to read from the local machine hive, you'll need to update your code:

Registry.LocalMachine.OpenSubKey("SOFTWARE\\Wow6432Node\\Shit", true)

Also, if either the Wow6432Node key doesn't exist (maybe you're running on a 32-bit OS?), or doesn't contain a key called Shit, then the OpenSubKey method will return null.

Upvotes: 4

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