如何用XML保存配置设定

    列表C里是对应的VB.NET代码，后面是先前提到的类。

列表C
Public Class Config Public Property WindowTitle() As String Get Return _wndowTitle End Get Set(ByVal Value As String) _wndowTitle = Value End Set End Property Public Property CopyrightText() As String Get Return _copyrightText End Get Set(ByVal Value As String) _copyrightText = Value End Set End Property Public Property CustomText() As String Get Return _customText End Get Set(ByVal Value As String) _customText = Value End Set End Property Private _wndowTitle As String Private _copyrightText As String Private _customText As String End Class

    列表D是应用程序代码。

列表D
Imports System.IO Imports System.Xml Imports System.Xml.Serialization Public Class Form1 Inherits System.Windows.Forms.FormReadOnlyfilepath As String = "c:test.xml" Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim cf As New Config Dim ser As New XmlSerializer(cf.GetType) Dim fs As FileStream If (File.Exists(filepath)) Thenfs = New FileStream(filepath, FileMode.Open)cf = CType(ser.Deserialize(fs), Config)lblTitle.Text = cf.WindowTitlelblCopyright.Text = cf.CopyrightTexttxtInput.Text = cf.CustomTextfs.Close() Elsefs = New FileStream(filepath, FileMode.CreateNew)lblTitle.Text = "TechRepublic.com Test Application"lblCopyright.Text = "2005" Dim tw As TextWritertw = New StreamWriter(fs)ser.Serialize(tw, cf)tw.Close()fs.Close() End If End Sub Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click Dim cf As New Config With cf .CopyrightText = lblCopyright.Text .WindowTitle = lblTitle.Text .CustomText = txtInput.Text End With Dim ser As New XmlSerializer(cf.GetType) Dim tw As TextWritertw = New StreamWriter(filepath, False)ser.Serialize(tw, cf)tw.Close() End Sub End Class

    在调入窗体的时候，有一个XML文件会被用来填充窗体里的控件。如果这个文件不存在，那么它就会被创建并被填充。这个窗体里有一个按钮，在被点击的时候会把数据保存在XML文件里。由于它是一个配置文件，所以当窗体被关闭或者数据值发生改变的时候，你可能需要自动地保存这个文件。

    用C#和VB.NET分别编写成的代码有一些小小的不同之处，但是它们基本上是一样的。这两种语言之间的一个重要不同之处是大小写敏感性。VB.NET对大小写不敏感，所以需要对类成员变量加上下划线，以便将其与属性名区分开来，而在C#里却没有这个问题。这个简单应用的一个重要方面就是序列化。

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