用VB.NET写的一个简易的RSS阅读器

源代码如下:

Imports System.Xml
Imports System.Threading

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()

'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写 dispose 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 ListBox1 As System.Windows.Forms.ListBox
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents AxWebBrowser1 As AxSHDocVw.AxWebBrowser
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents StatusBar1 As System.Windows.Forms.StatusBar
Friend WithEvents Label4 As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
Me.ListBox1 = New System.Windows.Forms.ListBox
Me.Button1 = New System.Windows.Forms.Button
Me.AxWebBrowser1 = New AxSHDocVw.AxWebBrowser
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.StatusBar1 = New System.Windows.Forms.StatusBar
Me.Label4 = New System.Windows.Forms.Label
CType(Me.AxWebBrowser1, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'ListBox1
'
Me.ListBox1.Location = New System.Drawing.Point(0, 67)
Me.ListBox1.Name = "ListBox1"
Me.ListBox1.Size = New System.Drawing.Size(727, 108)
Me.ListBox1.TabIndex = 0
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(629, 5)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(94, 56)
Me.Button1.TabIndex = 1
Me.Button1.Text = "读取"
'
'AxWebBrowser1
'
Me.AxWebBrowser1.Enabled = True
Me.AxWebBrowser1.Location = New System.Drawing.Point(-7, 184)
Me.AxWebBrowser1.OcxState = CType(resources.GetObject("AxWebBrowser1.OcxState"), System.Windows.Forms.AxHost.State)
Me.AxWebBrowser1.Size = New System.Drawing.Size(727, 480)
Me.AxWebBrowser1.TabIndex = 2
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(0, 26)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(624, 15)
Me.Label1.TabIndex = 3
Me.Label1.Text = "网站地址："
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(0, 45)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(624, 14)
Me.Label2.TabIndex = 4
Me.Label2.Text = "网站描述："
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(72, 0)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(552, 20)
Me.TextBox1.TabIndex = 6
Me.TextBox1.Text = "Http://Blog.CSDN.Net/AppleBBS/Rss.aspx"
'
'StatusBar1
'
Me.StatusBar1.Location = New System.Drawing.Point(0, 495)
Me.StatusBar1.Name = "StatusBar1"
Me.StatusBar1.Size = New System.Drawing.Size(726, 22)
Me.StatusBar1.TabIndex = 7
Me.StatusBar1.Text = "StatusBar1"
'
'Label4
'
Me.Label4.Location = New System.Drawing.Point(0, 6)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(72, 12)
Me.Label4.TabIndex = 8
Me.Label4.Text = "RSS地址："
Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(726, 517)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.StatusBar1)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.AxWebBrowser1)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.ListBox1)
Me.Name = "Form1"
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
Me.Text = "Easy RSS Reader"
CType(Me.AxWebBrowser1, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)

End Sub

#End Region
Private thread As Thread '定义一个线程
Private Sub loadrss() '读取RSS文件并取出内容标题的过程
StatusBar1.Text = "正在读取" & TextBox1.Text & "并效验"
Me.loadxmltocache(TextBox1.Text)
StatusBar1.Text = "正在读取相关网站信息"
Me.loadtitle()
StatusBar1.Text = "正在读取相RSS内容项"
Me.loaditem()
StatusBar1.Text = "完成"
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
thread = New Thread(AddressOf loadrss)
thread.Start()
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
AxWebBrowser1.Width = Me.Width
StatusBar1.Text = "就绪"
End Sub
Private Sub loadxmltocache(ByVal URL As String)
'读取RSS文件并存放在本地以供操作
Dim xmldocument As New XmlDocument
xmldocument.Load(URL)
xmldocument.Save(Application.StartupPath & "~doc.xml")
End Sub
Private Sub loadtitle()
'从本地文件中进行操作，读取RSS中有关网站的信息
Dim xmlDocument As New XmlDocument
xmlDocument.Load(Application.StartupPath & "~doc.xml")
Dim mynodelist As XmlNodeList
mynodelist = xmlDocument.SelectNodes("/rss/channel")
Label1.Text = "网站：" & Trim(mynodelist(0).Item("title").InnerText())
Label2.Text = "描述：" & Trim(mynodelist(0).Item("description").InnerText())
End Sub
Private Sub loaditem()
'从本地文件中进行操作，读取RSS中内容的标题及作者
Dim xmlDocument As New XmlDocument
xmlDocument.Load(Application.StartupPath & "~doc.xml")
Dim mynodelist As XmlNodeList
mynodelist = xmlDocument.SelectNodes("/rss/channel/item")
ListBox1.Items.Clear()
Dim i As Integer
For i = 0 To mynodelist.Count - 1
ListBox1.Items.Add("[" & Trim(mynodelist(i).Item("dc:creator").InnerText()) & "]" & Trim(mynodelist(i).Item("title").InnerText()))
Next
End Sub

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
thread = New Thread(AddressOf loadhtml)
thread.Start()
End Sub
Private Sub loadhtml()
'读取RSS中对应文件的内容并存到临时文件后显示
Dim xmlDocument As New XmlDocument
xmlDocument.Load(Application.StartupPath & "~doc.xml")
Dim mynodelist As XmlNodeList
mynodelist = xmlDocument.SelectNodes("/rss/channel/item")
Dim i As Integer
Dim j As Boolean
Dim content As String
StatusBar1.Text = "正在读取文章内容"
For i = 0 To mynodelist.Count - 1
If ListBox1.SelectedItem = "[" & Trim(mynodelist(i).Item("dc:creator").InnerText()) & "]" & Trim(mynodelist(i).Item("title").InnerText()) Then
content = content & "<html><head><meta http-equiv='content-type' content='text/html;charset=UTF-8'></head><body leftmargin='5' topmargin='0' rightmargin='0'>"
content = content & "<table width='100%' height='80' bgcolor='#eeeeee'><tr><td><b>标题：</b><a href='"
content = content & Trim(mynodelist(i).Item("link").InnerText())
content = content & "'>"
content = content & Trim(mynodelist(i).Item("title").InnerText())
content = content & "</a><br><b>作者：</b>"
content = content & Trim(mynodelist(i).Item("dc:creator").InnerText())
content = content & "<br><b>日期：</b>"
content = content & Trim(mynodelist(i).Item("pubDate").InnerText())
content = content & "</td></tr></table><table><tr><td><b>摘要：</b>"
content = content & formatHtml(mynodelist(i).Item("description").InnerText())
content = content & "</td></tr></table></body></html>"
j = SaveTextFile(Application.StartupPath & "~temp.html", content)
AxWebBrowser1.Navigate(Application.StartupPath & "~temp.html")
Exit For
End If
Next
StatusBar1.Text = "完成"
End Sub
'写文件的过程
Function SaveTextFile(ByVal FilePath As String, ByVal FileContent As String) As Boolean
Dim sw As System.IO.StreamWriter
Try
sw = New System.IO.StreamWriter(FilePath, False)
sw.Write(FileContent)
Return True
Catch e As Exception
Return False
Finally
If Not sw Is Nothing Then sw.Close()
End Try
End Function
'从地址里取网址的函数
Private Function formatURL(ByVal str As String) As String
Dim sStr As String
Dim i As Integer
Dim j As Integer
For i = 1 To Len(str)
sStr = sStr & Mid(str, i, 1)
If Mid(str, i, 1) = "/" Then
j += 1
End If
If j = 3 Then Exit For
Next
Return sStr
End Function
'将内容里的相对图片地址改成绝对地址的函数
Private Function formatHtml(ByVal str As String) As String
Return Replace(str, "src=" & Chr(34) & "/", "src =" & Chr(34) & formatURL(TextBox1.Text))
End Function

Private Sub TextBox1_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.Enter
Try
thread = New Thread(AddressOf loadrss)
thread.Start()
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
End Class

转自: http://www.cnblogs.com/aowind/archive/2005/03/16/119838.html