WPF RichTextBox中有类似GetFirstCharIndexOfCurrentLine()和GetLineFromCharIndex(index)的函数

Question

我想得到RichTextBox的光标所在行和列，在WinForm中可以调用这2个函数，但是在WPF的RichTextBox中好像没有这2个函数

Answer 1

请使用CaretPosition属性，参考这里：

http://msdn.microsoft.com/zh-CN/library/system.windows.controls.richtextbox.caretposition(v=vs.90).aspx

Answer 2

这我也看过，但好像没有找到解决的办法

Answer 3

你好，

你可以通过如下方法计算光标所在的行列值：

private void Button_Click(object sender, RoutedEventArgs e)
{
            TextPointer tp1 = rtb.Selection.Start.GetLineStartPosition(0);
            TextPointer tp2 = rtb.Selection.Start;

            int column = tp1.GetOffsetToPosition(tp2);

            int someBigNumber = int.MaxValue;
            int lineMoved, currentLineNumber;
            rtb.Selection.Start.GetLineStartPosition(-someBigNumber, out lineMoved);
            currentLineNumber = -lineMoved;

            LineColumnLabel.Content = "Line: " + currentLineNumber.ToString() + " Column: " + column.ToString();
}

XAML:

<Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="30" />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>
        <RichTextBox x:Name="rtb" />
        <Label Grid.Row="1" x:Name="LineColumnLabel" />
        <Button Grid.Row="2" Content="Get Current Line and Column" Click="Button_Click" />
    </Grid>

截图：

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Answer 4

太感谢 了！ 我去研究下