RichTextbox - 行长选择问题

Question

我正在编写一个小应用程序，我可以在其中加载文本文件以匹配正则表达式：

我根据匹配行的长度更改前景色，

问题是如果一行是多行，那么它不会按预期工作，并且只选择该行的一半，例如以“title”开头的第二行，这样：

Title   : Kirsty Maccoll - A New England: The Very Best of Kirsty Maccoll

您可以在这里看到问题：

但奇怪的是，如果我调整表单的大小以让我看到整行，然后我重新键入 RegEx，它就会按预期工作并选择整行：

如果不调整表单大小，我不知道如何解决这个问题。

这是我用来更改前景色的代码：

Private Sub MatchRegEx()
    Label_Matched_Value.Text = "0"
    Label_Missed_Value.Text = "0"

    If (TextBox_RegEx.Text = "" Or TextBox_RegEx.Text = TextBox_Hint) And RichTextBox_Strings.Text.Length = 0 Then
        Label_Info.Text = ""
        RichTextBox_Strings.Select(0, RichTextBox_Strings.Text.Length)
        RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
    ElseIf (TextBox_RegEx.Text = "" Or TextBox_RegEx.Text = TextBox_Hint) And RichTextBox_Strings.Text.Length > 0 Then
        Label_Info.Text = ""
        RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
    Else
        Try
            Label_Info.Text = "Valid RegEx"
            For i As Integer = 0 To RichTextBox_Strings.Lines.Length - 1
                If System.Text.RegularExpressions.Regex.IsMatch(RichTextBox_Strings.Lines(i), RegEx) Then
                    If Not RichTextBox_Strings.Focused Then
                        RichTextBox_Strings.Select(RichTextBox_Strings.GetFirstCharIndexFromLine(i), RichTextBox_Strings.Lines(i).Length)
                    End If
                    RichTextBox_Strings.SelectionColor = Color.LimeGreen
                    Label_Matched_Value.Text = CInt(Label_Matched_Value.Text) + 1
                Else
                    If Not RichTextBox_Strings.Focused Then
                        RichTextBox_Strings.Select(RichTextBox_Strings.GetFirstCharIndexFromLine(i), RichTextBox_Strings.Lines(i).Length)
                    End If
                    RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
                    Label_Missed_Value.Text = CInt(Label_Missed_Value.Text) + 1
                End If
            Next
        Catch ex As Exception
            Label_Info.Text = "Invalid RegEx"
            RichTextBox_Strings.SelectAll()
            RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
        End Try
    End If
End Sub

以及示例文本：

Title   : The Upbeats - Primitive Technique
Genre   : Drum & Bass
Year    : 2013
Page    : http://www.mp3crank.com/the-upbeats/primitive-technique.htm
Download: http://potload.com/zj0scbxjuw90



Title   : Kirsty Maccoll - A New England: The Very Best of Kirsty Maccoll
Genre   : Folk, Pop
Year    : 2013
Page    : http://www.mp3crank.com/kirsty-maccoll/a-new-england-the-very-best-of-kirsty-maccoll.htm
Download: http://potload.com/ziixpepo07lu



Title   : Of Montreal - Young Froth / Taypiss
Genre   : Indie, Pop
Year    : 2013
Page    : http://www.mp3crank.com/of-montreal/young-froth-taypiss.htm
Download: http://potload.com/hyc4okxucnlu

更新：

我已经调试了问题并且值是正确的：

Line 0 - selected range: 43 length
Line 8 - selected range: 73 length
Line 16 - selected range: 45 length

是“标题”行的确切行数和长度（当调整表格大小以查看整行时）。

更新 2：

如果我将 Richtextbox 的 textfont 更改为 5pt 之类的小字体（以默认表单大小显示整行），那么一切都会按预期工作..

所以这个问题似乎是这样的，当整行显示为多行时，因为整行不适合表单的大小，所以它算作多行？ p>

如何解决？

更新 3：

如果要测试的话，这是完整的源代码...

Public Class Form1

#Region " Vars / Properties "

    Dim TextBox_Hint As String = "Type your RegEx here..."
    Dim MatchRegEx_Flag As Boolean = True

    Public Property RegEx() As String
        Get
            Return TextBox_RegEx.Text
        End Get
        Set(ByVal value As String)
            TextBox_RegEx.Text = value
        End Set
    End Property

#End Region

#Region " Controls "

    ' TextBox RegEx [Enter/Leave]
    Private Sub TextBox_RegEx_Hint(sender As Object, e As EventArgs) Handles TextBox_RegEx.Enter, TextBox_RegEx.Leave
        If sender.Text = TextBox_Hint Then
            Label_Info.Text = ""
            sender.text = ""
        ElseIf sender.Text = "" Then
            sender.text = TextBox_Hint
            Label_Info.Text = ""
        End If
    End Sub

    ' TextBox RegEx [TextChanged]
    Private Sub TextBox_RegEx_TextChanged(sender As Object, e As EventArgs) Handles TextBox_RegEx.TextChanged
        If MatchRegEx_Flag Then
            MatchRegEx_Flag = False
            MatchRegEx()
            MatchRegEx_Flag = True
        End If

    End Sub

    ' Button Copy RegEx [Click]
    Private Sub Button_Copy_RegEx_Click(sender As Object, e As EventArgs) Handles Button_Copy_RegEx.Click
        Clipboard.SetText(TextBox_RegEx.Text)
    End Sub

    ' Button Copy Matches [Click]
    Private Sub Button_Copy_Matches_Click(sender As Object, e As EventArgs) Handles Button_Copy_Matches.Click
        Clipboard.SetText(" ")
        For i As Integer = 0 To RichTextBox_Strings.Lines.Length - 1
            If System.Text.RegularExpressions.Regex.IsMatch(RichTextBox_Strings.Lines(i), RegEx) Then
                RichTextBox_Strings.Select(RichTextBox_Strings.GetFirstCharIndexFromLine(i), RichTextBox_Strings.Lines(i).Length)
                Clipboard.SetText(Clipboard.GetText & vbNewLine & RichTextBox_Strings.SelectedText)
            End If
        Next
    End Sub

    ' Button Load [ Click]
    Private Sub Button_TextFile_Click(sender As Object, e As EventArgs) Handles Button_TextFile.Click
        Dim Textfile As New OpenFileDialog()
        Textfile.InitialDirectory = Environ("programfiles")
        Textfile.Title = "Load a text from file..."
        Textfile.Filter = "Text-files|*.txt"
        If Textfile.ShowDialog() = DialogResult.OK Then
            RichTextBox_Strings.SuspendLayout()
            RichTextBox_Strings.Text = My.Computer.FileSystem.ReadAllText(Textfile.FileName)
            RichTextBox_Strings.ResumeLayout()
        End If
    End Sub

    ' RichTextBox [MouseHover]
    Private Sub RichTextBox_Strings_MouseHover(sender As Object, e As EventArgs) Handles RichTextBox_Strings.MouseHover
        'sender.focus()
    End Sub

    ' RichTextBox [TextChanged]
    Private Sub RichTextBox_Strings_TextChanged(sender As Object, e As EventArgs) Handles RichTextBox_Strings.TextChanged
        If MatchRegEx_Flag Then
            MatchRegEx_Flag = False
            MatchRegEx()
            MatchRegEx_Flag = True
        End If
    End Sub

#End Region

#Region " Procedures "

    Private Sub MatchRegEx()
        Label_Matched_Value.Text = "0"
        Label_Missed_Value.Text = "0"
        If (TextBox_RegEx.Text = "" Or TextBox_RegEx.Text = TextBox_Hint) And RichTextBox_Strings.Text.Length = 0 Then
            Label_Info.Text = ""
            RichTextBox_Strings.Select(0, RichTextBox_Strings.Text.Length)
            RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
        ElseIf (TextBox_RegEx.Text = "" Or TextBox_RegEx.Text = TextBox_Hint) And RichTextBox_Strings.Text.Length > 0 Then
            Label_Info.Text = ""
            RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
        Else
            Try
                Label_Info.Text = "Valid RegEx"
                For i As Integer = 0 To RichTextBox_Strings.Lines.Length - 1
                    If System.Text.RegularExpressions.Regex.IsMatch(RichTextBox_Strings.Lines(i), RegEx) Then
                        If Not RichTextBox_Strings.Focused Then
                            RichTextBox_Strings.Select(RichTextBox_Strings.GetFirstCharIndexFromLine(i), RichTextBox_Strings.Lines(i).Length)
                        End If
                        RichTextBox_Strings.SelectionColor = Color.LimeGreen
                        Label_Matched_Value.Text = CInt(Label_Matched_Value.Text) + 1
                    Else
                        If Not RichTextBox_Strings.Focused Then
                            RichTextBox_Strings.Select(RichTextBox_Strings.GetFirstCharIndexFromLine(i), RichTextBox_Strings.Lines(i).Length)
                        End If
                        RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
                        'MsgBox(RichTextBox_Strings.Lines(i))
                        Label_Missed_Value.Text = CInt(Label_Missed_Value.Text) + 1
                    End If
                Next
            Catch ex As Exception
                ' MsgBox(ex.Message)
                Label_Info.Text = "Invalid RegEx"
                RichTextBox_Strings.SelectAll()
                RichTextBox_Strings.SelectionColor = Color.FromArgb(248, 248, 242)
            End Try
        End If
    End Sub

#End Region

End Class

Answer 1

见Counting lines displayed by richtextbox in C#和http://msdn.microsoft.com/en-us/library/system.windows.forms.richtextbox.getlinefromcharindex.aspx。

或者，完全关闭自动换行，并让框水平滚动。

Answer 2

我以前也遇到过这个问题吗？将wordwrap 属性禁用到富文本框可能会解决您的问题:)