Question

我的表单上有一个RichTextBox控件。该控件的设置方式是，在输入32行文本后，它将换行到下一行。我遇到的问题是，我希望能够检索表示我控制的行的字符串数组。我知道RichTextBox附带了一个Lines属性，但我遇到了两个问题：

1）我只想要一个字符串数组，显示仅在屏幕上可见的行。现在Lines数组返回RichTextBox中的每一行。我只想返回屏幕上可见的行。

2) The Lines property is not giving me a true representation of my lines. It counts a "line" as a line of text ended by a carriage return or . So in other words, if I type 64 characters and none of them are a carriage return, then it should return 2 lines (because there are 32 characters per line). Instead, it doesn t return any lines until I hit enter. Even then, it only returns 1 line, not 2. Its acting more like a Paragraph property, if there was such a thing.

有人知道解决这两个问题的方法吗？我正在使用C#btw

Answer 1

你必须做一些技巧来实现这一点，这些技巧与根据字符索引查询实际行的位置有关。下面的程序显示了一种方法。你可能需要稍微加强一下，但它应该让你开始：

public partial class Form1 : Form
{        
    public Form1()
    {
        InitializeComponent();                        
    }        

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

        // Lines corresponding to the first and last characters:
        int firstLine = richTextBox1.GetLineFromCharIndex(0); 
        int lastLine = richTextBox1.GetLineFromCharIndex(richTextBox1.Text.Length);

        // Get array of lines:
        List<string> lines = new List<string>();
        for (int i = firstLine; i <= lastLine; i++)
        {
            int firstIndexFromLine = richTextBox1.GetFirstCharIndexFromLine(i);
            int firstIndexFromNextLine = richTextBox1.GetFirstCharIndexFromLine(i + 1);

            if (firstIndexFromNextLine == -1)
            {
                // Get character index of last character in this line:
                Point pt = new Point(richTextBox1.ClientRectangle.Width, richTextBox1.GetPositionFromCharIndex(firstIndexFromLine).Y);
                firstIndexFromNextLine = richTextBox1.GetCharIndexFromPosition(pt);
                firstIndexFromNextLine += 1;
            }

            lines.Add(richTextBox1.Text.Substring(firstIndexFromLine, firstIndexFromNextLine - firstIndexFromLine));
        }

        // Print to richTextBox2 while debugging:
        richTextBox2.Text = "";
        foreach (string line in lines)
        {
            richTextBox2.AppendText(">> " + line + Environment.NewLine);
        }                        
    }
}

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