如何在RichTextBox C中显示行号#

我尝试重新使用其他地方引用的codeproject文章中的代码,但是我看到的每一个选项似乎都有点太模糊了。

可以打开或关闭行号。很快。它滚动的很干净。您可以选择数字的颜色、渐变的背景色、边框粗细、字体、是否使用前导零。您可以选择“按显示”或根据RTB中的硬换行对行进行编号。

它有局限性:它只在左边显示数字。如果你愿意的话,你可以不费吹灰之力改变这一切。

See the code

我会将每一行存储在一个类中,该类有方法发布到richtextbox。在该方法中,可以根据行号在类中的位置预先设置行号。

例如(非常粗略):

class myText
{
    public List<string> Lines;

    public string GetList()
    {
        StringBuilder sb = new StringBuilder();
        int i = 0;
        foreach (string s in Lines)
        {
            sb.AppendFormat("{0}: {1}", i, s).AppendLine();
            i++;
        }
        return sb.ToString();
    }
}

闪烁.Net http://scintillanet.codeplex.com/ 但对于我的项目,我使用了Cheeso建议的解决方案(来自XPath可视化工具的RichTextBoxEx)。对于不太大的文档来说,它足够简单和快速。 互联网上所有其他的.net组件都非常慢。

简单的方法是:

Dim myArray = RichTextBox1.Text.Split()

Dim cnt As Integer = 0
RichTextBox1.Clear()

Do While cnt < myArray.Count
  RichTextBox1.AppendText(cnt & ":" & myArray(cnt) & vbNewLine)
  cnt = cnt + 1
Loop

    public int getWidth()
    {
        int w = 25;
        // get total lines of richTextBox1
        int line = richTextBox1.Lines.Length;

        if (line <= 99)
        {
            w = 20 + (int)richTextBox1.Font.Size;
        }
        else if (line <= 999)
        {
            w = 30 + (int)richTextBox1.Font.Size;
        }
        else
        {
            w = 50 + (int)richTextBox1.Font.Size;
        }

        return w;
    }

    public void AddLineNumbers()
    {
        // create & set Point pt to (0,0)
        Point pt = new Point(0, 0);
        // get First Index & First Line from richTextBox1
        int First_Index = richTextBox1.GetCharIndexFromPosition(pt);
        int First_Line = richTextBox1.GetLineFromCharIndex(First_Index);
        // set X & Y coordinates of Point pt to ClientRectangle Width & Height respectively
        pt.X = ClientRectangle.Width;
        pt.Y = ClientRectangle.Height;
        // get Last Index & Last Line from richTextBox1
        int Last_Index = richTextBox1.GetCharIndexFromPosition(pt);
        int Last_Line = richTextBox1.GetLineFromCharIndex(Last_Index);
        // set Center alignment to LineNumberTextBox
        LineNumberTextBox.SelectionAlignment = HorizontalAlignment.Center;
        // set LineNumberTextBox text to null & width to getWidth() function value
        LineNumberTextBox.Text = "";
        LineNumberTextBox.Width = getWidth();
        // now add each line number to LineNumberTextBox upto last line
        for (int i = First_Line; i <= Last_Line + 2; i++)
        {
            LineNumberTextBox.Text += i + 1 + "\n";
        }
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        LineNumberTextBox.Font = richTextBox1.Font;
        richTextBox1.Select();
        AddLineNumbers();
    }

    private void richTextBox1_SelectionChanged(object sender, EventArgs e)
    {
        Point pt = richTextBox1.GetPositionFromCharIndex(richTextBox1.SelectionStart);
        if (pt.X == 1)
        {
            AddLineNumbers();
        }
    }

    private void richTextBox1_VScroll(object sender, EventArgs e)
    {
        LineNumberTextBox.Text = "";
        AddLineNumbers();
        LineNumberTextBox.Invalidate();
    }

    private void richTextBox1_TextChanged(object sender, EventArgs e)
    {
        if (richTextBox1.Text == "")
        {
            AddLineNumbers();
        }
    }

    private void richTextBox1_FontChanged(object sender, EventArgs e)
    {
        LineNumberTextBox.Font = richTextBox1.Font;
        richTextBox1.Select();
        AddLineNumbers();
    }

    private void LineNumberTextBox_MouseDown(object sender, MouseEventArgs e)
    {
        richTextBox1.Select();
        LineNumberTextBox.DeselectAll();
    }

    private void Form1_Resize(object sender, EventArgs e)
    {
        AddLineNumbers();
    }

下面是一个如何画自己的例子 link