在VB.NET中如何快速訪問注冊表的技巧代碼

2020-02-09 10:26:16

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vb.net中訪問注冊表變得非常的簡單。我們可以用microsoft.Win32 名稱空間的下的registry類和registryKey類。另外My.Computer.Registry 也可以返回一個Microsoft.Win32.Registry類的實例。
　　下面就舉幾個小例子來說明vb.net訪問注冊表的方法。
　　１、返回或創建一個注冊表鍵

　　Dim Key1 As Microsoft.Win32.RegistryKey
Key1 = My.Computer.Registry.CurrentUser '返回當前用戶鍵
Dim Key2 As Microsoft.Win32.RegistryKey
Key2 = Key1.OpenSubKey("northsnow") '返回當前用戶鍵下的northsnow鍵
If Key2 Is Nothing Then
Key2 = Key1.CreateSubKey("northsnow") '如果鍵不存在就創建它
End If

　　2、刪除注冊表鍵

　　Dim Key1 As Microsoft.Win32.RegistryKey
Key1 = My.Computer.Registry.CurrentUser '返回當前用戶鍵
Dim Key2 As Microsoft.Win32.RegistryKey
Key2 = Key1.OpenSubKey("northsnow") '返回當前用戶鍵下的northsnow鍵
If Not Key2 Is Nothing Then
Key1.DeleteSubKey("northsnow") '如果鍵不存在就創建它
End If

　　3、創建或讀取注冊表項　

　　Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回當前用戶鍵 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow", True) '返回當前用戶鍵下的northsnow鍵,
　　如果想創建項，必須指定第二個參數為true 
If Key2 Is Nothing Then 
Key2 = Key1.CreateSubKey("northsnow") '如果鍵不存在就創建它 
End If 
'創建項，如果不存在就創建，如果存在則覆蓋 
Key2.SetValue("name", "塞北的雪") 
Key2.SetValue("sex", True) 
Key2.SetValue("age", 30) 
'返回項值 
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) 
'查驗某個項是否存在 
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 
　　'輸出 
' 塞北的雪 
'True 
'30 
'yes 
'no

4、遍歷注冊表
　　這個也非常簡單，　　在窗體上放一個按鈕和兩個文本框，添加如下的代碼：

　　Dim sb As New System.Text.StringBuilder '返回遍歷結果 
Dim sb2 As New System.Text.StringBuilder '返回讀取出錯的注冊表鍵 
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 '返回當前用戶鍵 
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 
'遍歷注冊表鍵樹 
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 
'遍歷某鍵下的項 
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