vb.net中访问注册表变得非常的简单。我们可以用 microsoft.Win32 名称空间的　下的　registry 类　和　　registryKey　类。　另外　My.Computer.Registry 也可以返回一个 Microsoft.Win32.Registry　类的实例。
下面就举几个小例子来说明vb.net访问注册表的方法。

1,返回或创建一个注册表键

Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回当前用户键 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow") '返回当前用户键下的northsnow键 
If Key2 Is Nothing Then
    Key2 = Key1.CreateSubKey("northsnow") '如果键不存在就创建它 
End If

2,删除注册表键

Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回当前用户键 
Dim Key2 As Microsoft.Win32.RegistryKey
Key2 = Key1.OpenSubKey("northsnow") '返回当前用户键下的northsnow键 
If Not Key2 Is Nothing Then
    Key1.DeleteSubKey("northsnow") '如果键不存在就创建它 
End If

3,创建或读取注册表项

Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回当前用户键 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow", True) '返回当前用户键下的northsnow键,如果想创建项，必须指定第二个参数为true 
If Key2 Is Nothing Then
    Key2 = Key1.CreateSubKey("northsnow") '如果键不存在就创建它 
End If
         
'创建项，如果不存在就创建，如果存在则覆盖 
Key2.SetValue("name", "塞北的雪") 
Key2.SetValue("sex", True) 
Key2.SetValue("age", 30)
         
'返回项值 
Dim sb As New System.Text.StringBuilder 
sb.AppendLine(Key2.GetValue("name")) 
sb.AppendLine(Key2.GetValue("sex")) 
sb.AppendLine(Key2.GetValue("age")) 
MsgBox(sb.ToString)
         
'查验某个项是否存在 
If (Key2.GetValue("name")) Is Nothing Then
    MsgBox("no") 
Else
    MsgBox("yes") 
End If
If (Key2.GetValue("name2")) Is Nothing Then
    MsgBox("no") 
Else
    MsgBox("yes") 
End If

'输出
' 塞北的雪
'True
'30
'yes
'no

4,遍历注册表

这个也非常简单，在窗体上放一个按钮和两个文本框，添加如下的代码

Dim sb As New System.Text.StringBuilder '返回遍历结果 
Dim sb2 As New System.Text.StringBuilder '返回读取出错的注册表键 
Private Sub Button3_Click()Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click 
    Dim Key1 As Microsoft.Win32.RegistryKey 
    Key1 = My.Computer.Registry.CurrentUser '返回当前用户键 
    If Not Key1 Is Nothing Then
        sb.AppendLine(Key1.Name) 
        readValue(Key1) 
        readReg(Key1) 
    End If
    Me.TextBox1.Text = sb.ToString 
    Me.TextBox2.Text = sb2.ToString 
End Sub
     
'遍历注册表键树 
Private Sub readReg()Sub readReg(ByVal r As Microsoft.Win32.RegistryKey) 
        If r.SubKeyCount > 0 Then
        Dim keyName() As String
        Dim keyTemp As Microsoft.Win32.RegistryKey 
        keyName = r.GetSubKeyNames 
        Dim i As Integer
        For i = 0 To keyName.GetLength(0) - 1 
            Try
                sb.AppendLine(keyName(i)) 
                keyTemp = r.OpenSubKey(keyName(i), True) 
                readValue(keyTemp) 
                readReg(keyTemp) 
            Catch ex As Exception 
                sb2.AppendLine(keyName(i)) 
            End Try
        Next
    End If
End Sub