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 

　　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 

　　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 

　　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 
'遍历某键下的项 
Private Sub readValue()Sub readValue(ByVal r As Microsoft.Win32.RegistryKey) 
If r.ValueCount > 0 Then 
Dim valueName() As String 
Dim i As Integer 
valueName = r.GetValueNames 
For i = 0 To valueName.GetLength(0) - 1 
sb.AppendLine("####") 
sb.Append(r.Name) 
sb.Append("----") 
sb.Append(r.GetValue(valueName(i)).ToString) 
Next 
End If 
End Sub