续上一节，主要代码如下：

Public Class Form3
    Dim FontName As String
    Dim FontSize As Integer

    Private Sub Form3_Load(sender As Object,e As EventArgs) Handles MyBase.Load
        FontName = "宋体"
        FontSize = 10
        ToolStripComboBox1.Text = ToolStripComboBox1.Items(0)
        ToolStripComboBox2.Text = "10"
    End Sub

    '撤销
    Private Sub ToolStripButton11_Click(sender As Object,e As EventArgs) Handles ToolStripButton11.Click
        RichTextBox1.Undo()
    End Sub
    '重做
    Private Sub ToolStripButton12_Click(sender As Object,e As EventArgs) Handles ToolStripButton12.Click
        RichTextBox1.Redo()
    End Sub

    '设置文字颜色
    Private Sub ToolStripButton1_Click(sender As Object,e As EventArgs) Handles ToolStripButton1.Click
        If ColorDialog1.ShowDialog() = DialogResult.OK Then
            RichTextBox1.SelectionColor = ColorDialog1.Color
        End If
    End Sub
    '设置文字背景色
    Private Sub ToolStripButton2_Click(sender As Object,e As EventArgs) Handles ToolStripButton2.Click
        If ColorDialog1.ShowDialog() = DialogResult.OK Then
            RichTextBox1.SelectionBackColor = ColorDialog1.Color
        End If
    End Sub

    '设置文字字体
    Private Sub ToolStripComboBox1_TextChanged(sender As Object,e As EventArgs) Handles ToolStripComboBox1.SelectedIndexChanged
        FontName = ToolStripComboBox1.Text
        RichTextBox1.SelectionFont = New Font(FontName,FontSize)
    End Sub

    '设置文字大小
    Private Sub ToolStripComboBox2_TextChanged(sender As Object,e As EventArgs) Handles ToolStripComboBox2.TextChanged
        FontSize = ToolStripComboBox2.Text
        RichTextBox1.SelectionFont = New Font(FontName,FontSize)
    End Sub

    '设置粗体
    Private Sub ToolStripButton7_Click(sender As Object,e As EventArgs) Handles ToolStripButton7.Click
        Dim selFontName As String = RichTextBox1.SelectionFont.Name
        Dim selFontSize As Integer = RichTextBox1.SelectionFont.Size
        Dim selFontStyle As FontStyle = RichTextBox1.SelectionFont.Style Xor FontStyle.Bold
        RichTextBox1.SelectionFont = New Font(selFontName,selFontSize,selFontStyle)
    End Sub
    '设置斜体
    Private Sub ToolStripButton8_Click(sender As Object,e As EventArgs) Handles ToolStripButton8.Click
        Dim selFontName As String = RichTextBox1.SelectionFont.Name
        Dim selFontSize As Integer = RichTextBox1.SelectionFont.Size
        Dim selFontStyle As FontStyle = RichTextBox1.SelectionFont.Style Xor FontStyle.Italic
        RichTextBox1.SelectionFont = New Font(selFontName,selFontStyle)

    End Sub
    '设置下划线
    Private Sub ToolStripButton9_Click(sender As Object,e As EventArgs) Handles ToolStripButton9.Click
        Dim selFontName As String = RichTextBox1.SelectionFont.Name
        Dim selFontSize As Integer = RichTextBox1.SelectionFont.Size
        Dim selFontStyle As FontStyle = RichTextBox1.SelectionFont.Style Xor FontStyle.Underline
        RichTextBox1.SelectionFont = New Font(selFontName,selFontStyle)
    End Sub
    '左对齐
    Private Sub ToolStripButton4_Click(sender As Object,e As EventArgs) Handles ToolStripButton4.Click
        RichTextBox1.SelectionAlignment = HorizontalAlignment.Left
    End Sub
    '居中对齐
    Private Sub ToolStripButton5_Click(sender As Object,e As EventArgs) Handles ToolStripButton5.Click
        RichTextBox1.SelectionAlignment = HorizontalAlignment.Center
    End Sub
    '右对齐
    Private Sub ToolStripButton3_Click(sender As Object,e As EventArgs) Handles ToolStripButton3.Click
        RichTextBox1.SelectionAlignment = HorizontalAlignment.Right
    End Sub

    '设置富文本框背景色
    Private Sub ToolStripButton6_Click(sender As Object,e As EventArgs) Handles ToolStripButton6.Click
        If ColorDialog1.ShowDialog() = DialogResult.OK Then
            RichTextBox1.BackColor = ColorDialog1.Color
        End If
    End Sub

    '插入图片
    Private Sub ToolStripButton10_Click(sender As Object,e As EventArgs) Handles ToolStripButton10.Click
        Dim imgFile As String
        If OpenFileDialog2.ShowDialog = DialogResult.OK Then
            imgFile = OpenFileDialog2.FileName
        Else
            Exit Sub
        End If
        Dim bmp As Bitmap
        Try
            bmp = Bitmap.FromFile(imgFile)
            Clipboard.SetDataObject(bmp)
            Dim MyFormat As DataFormats.Format = DataFormats.GetFormat(DataFormats.Bitmap)
            If RichTextBox1.CanPaste(MyFormat) Then
                RichTextBox1.Paste(MyFormat)
            End If
        Catch ex As Exception
            MessageBox.Show("插入图片时发生错误")
        End Try
    End Sub

    '新建文件
    Private Sub 新建文件NToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 新建文件NToolStripMenuItem.Click
        RichTextBox1.Text = ""
    End Sub
    '载入文件
    Private Sub 载入文件LToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 载入文件LToolStripMenuItem.Click
        If OpenFileDialog1.ShowDialog = DialogResult.OK Then
            RichTextBox1.LoadFile(OpenFileDialog1.FileName)
        End If
    End Sub
    '保存文件
    Private Sub 保存文件SToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 保存文件SToolStripMenuItem.Click
        If SaveFileDialog1.ShowDialog = DialogResult.OK Then
            RichTextBox1.SaveFile(SaveFileDialog1.FileName)
        End If
    End Sub
    '剪切
    Private Sub 剪切ToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 剪切ToolStripMenuItem.Click
        Clipboard.SetData(DataFormats.Rtf,RichTextBox1.SelectedRtf）
        RichTextBox1.SelectedText = ""
    End Sub
    '复制
    Private Sub 复制CToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 复制CToolStripMenuItem.Click
        Clipboard.SetData(DataFormats.Rtf,RichTextBox1.SelectedRtf）
    End Sub
    '粘贴
    Private Sub 粘贴PToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 粘贴PToolStripMenuItem.Click
        RichTextBox1.SelectedRtf = Clipboard.GetData(DataFormats.Rtf)
    End Sub
    '关于
    Private Sub 关于AToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 关于AToolStripMenuItem.Click
        MessageBox.Show("这是一个富文件编辑器，可以编辑RTF文档" & ControlChars.CrLf & "来自： http://blog.csdn.net/uruseibest","编辑器",MessageBoxButtons.OK)
    End Sub
    '退出
    Private Sub 退出XToolStripMenuItem_Click(sender As Object,e As EventArgs) Handles 退出XToolStripMenuItem.Click
        Application.Exit()
    End Sub

    '鼠标按下时判断所在行数，修改到状态栏
    Private Sub RichTextBox1_MouseDown(sender As Object,e As MouseEventArgs) Handles RichTextBox1.MouseDown
        Dim allLines As Integer
        Dim curLines As Integer
        allLines = RichTextBox1.GetLineFromCharIndex(RichTextBox1.TextLength) + 1
        curLines = RichTextBox1.GetLineFromCharIndex(RichTextBox1.SelectionStart) + 1
        ToolStripStatusLabel1.Text = "总 " & allLines & "行 " & "第 " & curLines & "行 "
    End Sub

End Class