VB.NET中快速存取註冊表技巧

vb.net中訪問註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類的執行個體。

下面就舉幾個小例子來說明vb.net訪問註冊表的方法。

１、返回或建立一個註冊表鍵

 

Dim Key1 As Microsoft.Win32.RegistryKey Key1 = My.Computer.Registry.CurrentUser '返回目前使用者鍵 Dim Key2 As Microsoft.Win32.RegistryKey Key2 = Key1.OpenSubKey("northsnow") '返回目前使用者鍵下的northsnow鍵 If Key2 Is Nothing Then Key2 = Key1.CreateSubKey("northsnow") '如果鍵不存在就建立它 End If

 

2、刪除註冊表鍵

 

Dim Key1 As Microsoft.Win32.RegistryKey Key1 = My.Computer.Registry.CurrentUser '返回目前使用者鍵 Dim Key2 As Microsoft.Win32.RegistryKey Key2 = Key1.OpenSubKey("northsnow") '返回目前使用者鍵下的northsnow鍵 If Not Key2 Is Nothing Then Key1.DeleteSubKey("northsnow") '如果鍵不存在就建立它 End If

 

3、建立或讀取登錄機碼

4、遍曆註冊表

Dim Key1 As Microsoft.Win32.RegistryKey Key1 = My.Computer.Registry.CurrentUser '返回目前使用者鍵 Dim Key2 As Microsoft.Win32.RegistryKey Key2 = Key1.OpenSubKey("northsnow", True) '返回目前使用者鍵下的northsnow鍵, 如果想建立項，必須指定第二個參數為true If Key2 Is Nothing Then Key2 = Key1.CreateSubKey("northsnow") '如果鍵不存在就建立它 End If '建立項，如果不存在就建立，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

 

 

這個也非常簡單，在表單上放一個按鈕和兩個文字框，添加如下的代碼：

 

Dim sb As New System.Text.StringBuilder '返回遍曆結果 Dim sb2 As New System.Text.StringBuilder '返回讀取出錯的註冊表鍵 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 '返回目前使用者鍵 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 '遍曆註冊表鍵樹 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 '遍曆某鍵下的項 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