VB.NET如何实现图象文件和XML文件互换，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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通过.NET框架下的FromBase64String和ToBase64String方法可以很容易地实现图象文件和XML文件的互换。这样可以轻易解决以XML格式保存图片的问题。以下是利用VB.NET实现图象文件和XML文件的互换代码：
Public Class Form1 Inherits System.Windows.Forms.Form #Region " Windows 窗体设计器生成的代码 " Public Sub New() MyBase.New() InitializeComponent() 在 InitializeComponent() 调用之后添加任何初始化 End Sub 窗体重写处置以清理组件列表。 Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Windows 窗体设计器所必需的 Private components As System.ComponentModel.IContainer 注意：以下过程是 Windows 窗体设计器所必需的 可以使用 Windows 窗体设计器修改此过程。 不要使用代码编辑器修改它。 Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents Button2 As System.Windows.Forms.Button Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox Friend WithEvents Button3 As System.Windows.Forms.Button Friend WithEvents Label1 As System.Windows.Forms.Label Friend WithEvents Label2 As System.Windows.Forms.Label Private Sub InitializeComponent() Me.Button1 = New System.Windows.Forms.Button() Me.Button2 = New System.Windows.Forms.Button() Me.PictureBox1 = New System.Windows.Forms.PictureBox() Me.Button3 = New System.Windows.Forms.Button() Me.Label1 = New System.Windows.Forms.Label() Me.Label2 = New System.Windows.Forms.Label() Me.SuspendLayout() Button1 Me.Button1.Location = New System.Drawing.Point(365, 63) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(115, 23) Me.Button1.TabIndex = 0 Me.Button1.Text = "将图象保存成XML" Button2 Me.Button2.Location = New System.Drawing.Point(365, 98) Me.Button2.Name = "Button2" Me.Button2.Size = New System.Drawing.Size(115, 23) Me.Button2.TabIndex = 1 Me.Button2.Text = "从XML中得到图象" PictureBox1 Me.PictureBox1.Location = New System.Drawing.Point(18, 6) Me.PictureBox1.Name = "PictureBox1" Me.PictureBox1.Size = New System.Drawing.Size(320, 460) Me.PictureBox1.TabIndex = 2 Me.PictureBox1.TabStop = False Button3 Me.Button3.Location = New System.Drawing.Point(365, 28) Me.Button3.Name = "Button3" Me.Button3.Size = New System.Drawing.Size(115, 23) Me.Button3.TabIndex = 3 Me.Button3.Text = "浏览图片…" Label1 Me.Label1.Location = New System.Drawing.Point(369, 135) Me.Label1.Name = "Label1" Me.Label1.Size = New System.Drawing.Size(105, 95) Me.Label1.TabIndex = 4 Label2 Me.Label2.Location = New System.Drawing.Point(367, 437) Me.Label2.Name = "Label2" Me.Label2.Size = New System.Drawing.Size(130, 16) Me.Label2.TabIndex = 5 Me.Label2.Text = "【孟宪会之精彩世界】" Form1 Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(500, 480) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label2, Me.Label1, Me.Button3, Me.PictureBox1, Me.Button2, Me.Button1}) Me.Name = "Form1" Me.Text = "图象文件和XML格式文件互换例子" Me.ResumeLayout(False) End Sub #End Region Private MyFile As String = "" Private MyFileExt As String = "" Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles Button2.Click Dim pic As String Dim MyXml As System.Xml.XmlDocument = New System.Xml.XmlDocument() MyXml.Load("c:\MyPhoto.xml") Dim picNode As System.Xml.XmlNode picNode = MyXml.SelectSingleNode("/pic/photo") pic = picNode.InnerText Dim memoryStream As System.IO.MemoryStream memoryStream = New System.IO.MemoryStream(Convert.FromBase64String(pic)) Me.PictureBox1.Image = New System.Drawing.Bitmap(memoryStream) memoryStream.Close() End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles Button1.Click If MyFile = "" Then MessageBox.Show("请选择一个图片！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning) Exit Sub End If Dim MyImg As System.Drawing.Image = MyImg.FromFile(MyFile) Dim memoryStream As System.IO.MemoryStream = New System.IO.MemoryStream() MyImg.Save(memoryStream, GetImageType(MyFileExt)) Dim b() As Byte b = memoryStream.GetBuffer() Dim pic As String = Convert.ToBase64String(b) memoryStream.Close() Dim MyXml As System.Xml.XmlDocument = New System.Xml.XmlDocument() MyXml.LoadXml("孟宪会" + pic + "") MyXml.Save("c:\MyPhoto.xml") Label1.Text = "文件被保存到了：" + Microsoft.VisualBasic.ChrW(13) + "c:\MyPhoto.xml" End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles Button3.Click Dim openFileDialog1 As New OpenFileDialog() openFileDialog1.InitialDirectory = "c:\" openFileDialog1.Filter = "PNG(*.png)|*.png|Gif(*.gif)|*.gif|Jpg(*.jpg)|*.jpg|所有图象文件(*.*)|*.*" openFileDialog1.FilterIndex = 2 openFileDialog1.RestoreDirectory = True If openFileDialog1.ShowDialog() = DialogResult.OK Then MyFile = openFileDialog1.FileName() MyFileExt = MyFile.Substring(MyFile.LastIndexOf(".") + 1) End If End Sub Public Function GetImageType(ByVal str As String) As System.Drawing.Imaging.ImageFormat Select Case str.ToLower() Case "jpg" Return System.Drawing.Imaging.ImageFormat.Jpeg Case "gif" Return System.Drawing.Imaging.ImageFormat.Gif Case "tiff" Return System.Drawing.Imaging.ImageFormat.Tiff() Case "icon" Return System.Drawing.Imaging.ImageFormat.Icon Case "image/png" Return System.Drawing.Imaging.ImageFormat.Png Case Else Return System.Drawing.Imaging.ImageFormat.MemoryBmp End Select End Function Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) _ Handles MyBase.Closing System.Diagnostics.Process.Start("IExplore.exe", "http://xml.sz.luohuedu.net/") End Sub End Class
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