◆声明:我的“文章”只适宜初学者参考。我对...... 声明:我的“文章”只适宜初学者参考。我对概念理解模糊,参考者只参考思路则可。 主要做法: 第一步,将配置信息做一个简单的类。 要点:因为要用到序列化,而且是用XmlSerializer来序列化,所以要存到文件的变量信息都要声明为Public,要序列化的类用 示例:一个连接数据库的配置信息 '配置信息 '初始默认值 Public ID As Integer = 0 Public Server As String = "(Local)" Public Database As String = "NorthWind" Public Tusted As Boolean = True Public User As String = "" Public Password As String = "" End Class 第二步:配置处理的类。 说明:这个类是通用的。用到别的配置,你只需修改上面的配置信息类就可以了。它实现了存档和读取的功能,并转化为配置信息对象,操作起来较为方便。你可以添加内容加密的处理。 '默认ConnectionInfo的ID Public ID As Integer '必须是Public,XmlSerializer只对Pulbic变量作用 Public Items As Item() Private m_Count As Integer = 0 '添加配置信息 Public Sub Add(ByVal ConnectionInfo As Item) If ConnectionInfo Is Nothing Then Exit Sub If m_Count > 0 Then If Not Me.ConnectionInfo(ConnectionInfo.ID) Is Nothing Then MsgBox(ID.ToString & "已存在") Exit Sub End If End If ReDim Preserve Me.Items(m_Count) Me.Items(m_Count) = ConnectionInfo m_Count += 1 End Sub '取指定ID的配置信息 Public ReadOnly Property ConnectionInfo(ByVal ID As Integer) As Item Get Dim mItem As Item Dim i As Integer For i = 0 To m_Count - 1 If Me.Items(i).ID = ID Then mItem = Me.Items(ID) Exit For End If Next Return mItem End Get End Property '序列化并保存到指定文件 Public Sub SaveXmlFile(ByVal FileName As String) If Me Is Nothing Then Exit Sub Dim XmlWriter As New System.IO.StreamWriter(FileName, False) XmlWriter.Write(SerializeClass.GetXML(Me)) XmlWriter.Close() End Sub '从指定文件读取反序列化转为对象 Public Function LoadXmlFile(ByVal FileName As String) As Config Dim XmlReader As New System.IO.StreamReader(FileName, System.Text.Encoding.Default) Dim mConfig As Config mConfig = CType(SerializeClass.LoadXML(GetType(Config), XmlReader.ReadToEnd), Config) XmlReader.Close() mConfig.m_Count = mConfig.Items.Length Return mConfig End Function End Class 就以上两步就可以了,下面这个类是用来序列化用的。 '这是用XmlSerializer序列化对象的类 Public Class SerializeClass Public Shared Function GetXML(ByVal mObject As Object) As String Dim oSerializer As New System.Xml.Serialization.XmlSerializer(mObject.GetType) Dim oStringWriter As New System.IO.StringWriter oSerializer.Serialize(oStringWriter, mObject) Return oStringWriter.ToString End Function Public Shared Function LoadXML(ByVal mClass As Type, ByVal XML As String) As Object Dim oSerializer As New System.Xml.Serialization.XmlSerializer(mClass) Dim oStringReader As New System.IO.StringReader(XML) Return oSerializer.Deserialize(oStringReader) End Function End Class 以下是使用方法示例: '测试存配置文件 Private Sub TestSaveConfig() Dim mConfig As Config = New Config Dim mItem As Item mItem = New Item mConfig.Add(mItem) mItem = New Item With mItem .ID = 1 .User = "Master" .Password = "123456" .Tusted = False End With mConfig.Add(mItem) mConfig.SaveXmlFile(Application.StartupPath & "\Config.xml") End Sub '测试读配置文件 Private Sub TestLoadConfig() Dim mConfig As Config = New Config mConfig = mConfig.LoadXmlFile(Application.StartupPath & "\Config.xml") '读取默认值的用户名 MsgBox(mConfig.Items(mConfig.ID).User) '不妨修改一下配置 mConfig.ID = 1 mConfig.ConnectionInfo(0).Server = "Server" mConfig.ConnectionInfo(1).Database = "Master" '再存盘 mConfig.SaveXmlFile(Application.StartupPath & "\Config.xml") End Sub |
|小黑屋|最新主题|手机版|微赢网络技术论坛 ( 苏ICP备08020429号 )
GMT+8, 2024-9-30 07:17 , Processed in 0.191646 second(s), 12 queries , Gzip On, MemCache On.
Powered by Discuz! X3.5
© 2001-2023 Discuz! Team.