用vb.net写一个简易的RSS阅读器

先发一个做出来的效果图

哈哈！怎么样？对了DUDU，我这个还解决了看天下那个阅读器不能正常显示相对路径的图片的问题哟！
现在不管相对的还是绝对的路径的图片都能正常显示哈！

下面是源代码，没有太多注释，因为都比较简单嘛！

Imports System.Xml
Imports System.Threading

Public Class Form1Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()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()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()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.ItemHeight = 12
        Me.ListBox1.Location = New System.Drawing.Point(0, 72)
        Me.ListBox1.Name = "ListBox1"
        Me.ListBox1.Size = New System.Drawing.Size(872, 124)
        Me.ListBox1.TabIndex = 0
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(760, 0)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(112, 72)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "读取"
        '
        'AxWebBrowser1
        '
        Me.AxWebBrowser1.Enabled = True
        Me.AxWebBrowser1.Location = New System.Drawing.Point(0, 208)
        Me.AxWebBrowser1.OcxState = CType(resources.GetObject("AxWebBrowser1.OcxState"), System.Windows.Forms.AxHost.State)
        Me.AxWebBrowser1.Size = New System.Drawing.Size(872, 512)
        Me.AxWebBrowser1.TabIndex = 2
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(24, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(728, 16)
        Me.Label1.TabIndex = 3
        Me.Label1.Text = "网站："
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(24, 48)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(728, 16)
        Me.Label2.TabIndex = 4
        Me.Label2.Text = "描述："
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(88, 0)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(664, 21)
        Me.TextBox1.TabIndex = 6
        Me.TextBox1.Text = "http://www.cnblogs.com/aowind/Rss.aspx"
        '
        'StatusBar1
        '
        Me.StatusBar1.Location = New System.Drawing.Point(0, 725)
        Me.StatusBar1.Name = "StatusBar1"
        Me.StatusBar1.Size = New System.Drawing.Size(872, 24)
        Me.StatusBar1.TabIndex = 7
        Me.StatusBar1.Text = "StatusBar1"
        '
        'Label4
        '
        Me.Label4.Location = New System.Drawing.Point(16, 8)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(64, 16)
        Me.Label4.TabIndex = 8
        Me.Label4.Text = "RSS地址："
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(872, 749)
        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 = "简易RSS阅读器"
        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()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()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()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()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()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()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()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()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>"
                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 & "' target='_blank'>"
                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 & "</tb></tr></table>"
                content = content & formatHtml(mynodelist(i).Item("description").InnerText())
                content = content & "</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()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()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()Function formatHtml(ByVal str As String) As String
        Return Replace(str, "src=" & Chr(34) & "/", "src =" & Chr(34) & formatURL(TextBox1.Text))
    End Function
End Class