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(gè)Microsoft.Win32.Registry類的實(shí)例。
　　下面就舉幾個(gè)小例子來說明vb.net訪問注冊表的方法。
　　１、返回或創(chuàng)建一個(gè)注冊表鍵

　　Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回當(dāng)前用戶鍵 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow") '返回當(dāng)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(chuàng)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(dāng)前用戶鍵 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow") '返回當(dāng)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(chuàng)建它 
End If

　　3、創(chuàng)建或讀取注冊表項(xiàng) 　

　　Dim Key1 As Microsoft.Win32.RegistryKey 
Key1 = My.Computer.Registry.CurrentUser '返回當(dāng)前用戶鍵 
Dim Key2 As Microsoft.Win32.RegistryKey 
Key2 = Key1.OpenSubKey("northsnow", True) '返回當(dāng)前用戶鍵下的northsnow鍵,
　　如果想創(chuàng)建項(xiàng)，必須指定第二個(gè)參數(shù)為true 
If Key2 Is Nothing Then 
Key2 = Key1.CreateSubKey("northsnow") '如果鍵不存在就創(chuàng)建它 
End If 
'創(chuàng)建項(xiàng)，如果不存在就創(chuàng)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(xiàng)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(yàn)?zāi)硞€(gè)項(xiàng)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(gè)也非常簡單，　　在窗體上放一個(gè)按鈕和兩個(gè)文本框，添加如下的代碼：

　　Dim sb As New System.Text.StringBuilder '返回遍歷結(jié)果 
Dim sb2 As New System.Text.StringBuilder '返回讀取出錯(cuò)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(dāng)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(xiàng) 
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