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
' 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