'你调用的对象是空的。'从VB.NET中的注册表中读取时 [英] 'Object reference not set to an instance of an object.' when reading from the registry in VB.NET

问题描述

您好，我正在尝试从Visual Basic中的regedit键读取一个简单值。我希望程序读取密钥，然后将注册表值设置为该密钥的值。这是代码：

Hello, I'm trying to read a simple value from a regedit key in Visual Basic. I want the program to read the key, then set a registry value as the value of that key. Here's the code:

Shared Sub DWMDefault()
        Dim regKey As RegistryKey = _
My.Computer.Registry.LocalMachine.OpenSubKey("HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM", True)
        Dim ColorizationColor As Decimal = regKey.GetValue("ColorizationColor")
        regKey.SetValue("AccentColor", Convert.ToDecimal(ColorizationColor))
        regKey.SetValue("ColorizationColor", Convert.ToDecimal(ColorizationColor))
        regKey.Close()
    End Sub

它只是吐出错误，如包含

的行中的标题所示

It just spits out the error as seen in the title on the line that contains

Dim ColorizationColor As Decimal = regKey.GetValue("ColorizationColor")

请帮助，我不知道如何解决这个问题，也许只是觉得我犯了一些愚蠢的错误。希望就是这样，谢谢！



我尝试过：



我尝试将Colorization颜色作为一个字节和一个registryKey返回，但这些都没有。

Please help, I have no idea on what to do to fix this issue and maybe just thought I was making some silly mistake. Hopefully that's the case, thanks!

What I have tried:

I've tried returning the Colorization color as a byte and a registryKey, but neither of those worked.

推荐答案

你的代码说从localmachine开始并打开一个子项。但是，您为当前用户提供了完整的路径。这是有效的：

Your code says to start at localmachine and open a subkey. But you give a full path to current user. This works:

Dim regKey As RegistryKey =
My.Computer.Registry.CurrentUser.OpenSubKey("Software\Microsoft\Windows\DWM", False)
        Dim ColorizationColor As Decimal = regKey.GetValue("ColorizationColor")
        regKey.SetValue("AccentColor", Convert.ToDecimal(ColorizationColor))
        regKey.SetValue("ColorizationColor", Convert.ToDecimal(ColorizationColor))
        regKey.Close()

错误意味着什么它说，你的regKey值是Nothing

The error meant what it said, your regKey value was Nothing

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