在一个RichTextBox当前行数和列数在一个WinForms应用程序 [英] Current line and column numbers in a RichTextBox in a Winforms application

问题描述

我如何得到一个WinForms应用程序在一个RichTextBox当前行数和列数？

How do I get the current line and column numbers in a RichTextBox in a Winforms application?

注意

伙计们，我只想要一个简单的解决方案，如果可用有人和他愿意与我们分享，而不是链接做研究！只要给我一些code请！否则，我会买一个控制...

Folks, I just want a simple solution, if it's available by someone and he's willing to share it with us, and not links to do research! Just give me some code please! Otherwise, I'll have to buy a control...

推荐答案

有关的行和列，检查出的更丰富的RichTextBox 项目。它是支持的行和列号在RichTextBox的扩展版本。从文章的code：

For row and column, check out the Richer RichTextBox project. It is an extended version of the RichTextBox which supports the row and column numbers. The code from the article:

this.rtb.CursorPositionChanged += 
    new System.EventHandler(this.rtb_CursorPositionChanged);
this.rtb.SelectionChanged += 
    new System.EventHandler(this.rtb_SelectionChanged);
.
.
.
private void rtb_CursorPositionChanged(object sender, System.EventArgs e)
{
    int line = rtb.CurrentLine;
    int col = rtb.CurrentColumn;
    int pos = rtb.CurrentPosition;

    statusBar.Text = "Line " + line + ", Col " + col + 
                     ", Position " + pos;
}

private void rtb_SelectionChanged(object sender, System.EventArgs e)
{
    int start = rtb.SelectionStart;
    int end = rtb.SelectionEnd;
    int length = rtb.SelectionLength;

    statusBar.Text = "Start " + start + ", End " + end + 
                     ", Length " + length;
}

要实现这样的行为，我们需要扩展RichTextBox类以下列方式：

To achieve such behavior, we need to extend the RichTextBox class in the following manner:

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Nik.UserControls
{
    public class RicherTextBox2 : System.Windows.Forms.RichTextBox
    {
        public event EventHandler CursorPositionChanged;

        protected virtual void OnCursorPositionChanged( EventArgs e )
        {
            if ( CursorPositionChanged != null )
                CursorPositionChanged( this, e );
        }

        protected override void OnSelectionChanged( EventArgs e )
        {
            if ( SelectionLength == 0 )
                OnCursorPositionChanged( e );
            else
                base.OnSelectionChanged( e );
        }

        public int CurrentColumn
        {
            get { return CursorPosition.Column( this, SelectionStart ); }
        }

        public int CurrentLine
        {
            get { return CursorPosition.Line( this, SelectionStart ); }
        }

        public int CurrentPosition
        {
            get { return this.SelectionStart; }
        }

        public int SelectionEnd
        {
            get { return SelectionStart + SelectionLength; }
        }
    }

    internal class CursorPosition
    {
        [System.Runtime.InteropServices.DllImport("user32")] 
        public static extern int GetCaretPos(ref Point lpPoint);

        private static int GetCorrection(RichTextBox e, int index)
        {
            Point pt1 = Point.Empty;
            GetCaretPos(ref pt1);
            Point pt2 = e.GetPositionFromCharIndex(index);

            if ( pt1 != pt2 )
                return 1;
            else
                return 0;
        }

        public static int Line( RichTextBox e, int index )
        {
             int correction = GetCorrection( e, index );
             return e.GetLineFromCharIndex( index ) - correction + 1;
        }

        public static int Column( RichTextBox e, int index1 )
        {
             int correction = GetCorrection( e, index1 );
             Point p = e.GetPositionFromCharIndex( index1 - correction );

             if ( p.X == 1 )
                 return 1;

             p.X = 0;
             int index2 = e.GetCharIndexFromPosition( p );

             int col = index1 - index2 + 1;

             return col;
         }
    }
}

<一个href="http://stackoverflow.com/questions/657635/displaying-line-number-in-rich-text-box-c">Displaying在RichTextBox的行号，获取行号部分。

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