RichtextBox 行和列

1. 获得光标所在的行号
2. 获得光标所在的列号
3. 设置光标到指定行号
4. 设置光标到指定列号

http://www.huifangseo.com/blog/6/7.html

    获得光标所在的行号和列号

方法1

    int SelStart = richTextBox1.SelectionStart;
    int Line = 1 + richTextBox1.GetLineFromCharIndex(SelStart); //行值
    int Column = 1 + SelStart - (richTextBox1.GetFirstCharIndexFromLine(Line - 1));//列值
    Text = string.Format("行{0} 列{1}", Line, Column);  

方法2

using System.Runtime.InteropServices;

private int EM_LINEINDEX = 0x00BB;
private int EM_LINEFROMCHAR = 0x00C9;

[DllImport("user32.dll", EntryPoint = "SendMessage")]
public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

public Point GetCaretPosition(TextBoxBase editControl)
{
    int charIndex = (int)SendMessage(editControl.Handle, EM_LINEINDEX, -1, 0);//行值
    int lineIndex = (int)SendMessage(editControl.Handle, EM_LINEFROMCHAR, charIndex, 0);//列值
    return new Point(editControl.SelectionStart - charIndex, lineIndex);
} 

private void button2_Click(object sender, EventArgs e)
{
    Point pt = GetCaretPosition(richTextBox1);
    Text = string.Format("行{0} 列{1}", pt.X + 1, pt.Y+1);  
}

    http://bbs.csdn.net/topics/360049737

    设置光标到指定行号

方法1 GetFirstCharIndexFromLine

//转到第三行
int Line = 3;
richTextBox1.SelectionStart = richTextBox1.GetFirstCharIndexFromLine(Line - 1);
richTextBox1.SelectionLength = 0;
richTextBox1.ScrollToCaret();
richTextBox1.Focus();

方法2 SendMessage

//转到第3行
int Line = 3;
richTextBox1.SelectionStart = SendMessage(richTextBox1.Handle, EM_LINEINDEX, Line - 1, 0);
richTextBox1.SelectionLength = 0;
richTextBox1.ScrollToCaret();
richTextBox1.Focus();

    设置光标到指定列号

先转到指定行号，然后 加上当前光标的列号 richTextBox1.SelectionStart

private void jumpColumn(int Column)
{
    int Line = Column;

    int charIndex = (int)SendMessage(richTextBox1.Handle, EM_LINEINDEX, Line - 1, 0);
    int lineIndex = charIndex + (int)SendMessage(richTextBox1.Handle, EM_LINEFROMCHAR, charIndex, 0);
    
    richTextBox1.SelectionStart = lineIndex;
}

private void button4_Click(object sender, EventArgs e)
{
    //转到第5行 第5列
    richTextBox1.Focus();
    jumpColumn(5);
}