XAML RichEditBox行计数

Question

UWP Windows 10。

如何获取RichEditBox的行数？

我想要将行数、当前行和当前行绑定到statusbar中的标签(如记事本中)。我该怎么做呢？

Answer 1

看一下这个扩展的类

public class TextBoxEx : TextBox
{
    public TextBoxEx()
    { }

    public void GoTo(int line, int column)
    {
        if (line < 1 || column < 1 || this.Lines.Length < line)
            return;

        this.SelectionStart = this.GetFirstCharIndexFromLine(line - 1) + column - 1;
        this.SelectionLength = 0;
    }

    public int CurrentColumn
    {
        get { return this.SelectionStart - this.GetFirstCharIndexOfCurrentLine() + 1; }
    }

    public int CurrentLine
    {
        get { return this.GetLineFromCharIndex(this.SelectionStart) + 1; }
    }
}

或者更好；您可以像这样编写它：

public int CurrentColumn
{
get { return textBox1.SelectionStart - textBox1.GetFirstCharIndexOfCurrentLine() + 1; }
}