在RichTextBox中突出显示整行 [英] Highlight the entire line in a RichTextBox

问题描述

我要突出显示整个行，从头到尾都无所谓，字符是否存在以及行可能为空，但它应该突出显示整个行。

I want to highlight the entire line, from start to end doesn't matter whether characters are present or not and line may be blank but it should highlight the complete line.

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推荐答案

如果 WordWrap 已关闭，请在 RichTextBox 中突出显示一行：

This will highlight a full line in a RichTextBox if WordWrap is off:

void highLightALine(RichTextBox rtb, int line, Color hiLight)
{
    int i1 = rtb.GetFirstCharIndexFromLine(line);
    int i2 = rtb.GetFirstCharIndexFromLine(line + 1);
    if (i2 < 0) i2 = rtb.Text.Length;

    rtb.SelectionStart = i1;
    rtb.SelectionLength = i2 - i1;
    rtb.SelectionBackColor = hiLight;
}

请注意，如果 WordWrap 是的，它仍将突出显示该行，但仅在可见范围内。

Note that if WordWrap is true it will still highlight the line but only as far as it is visible. Its continuation on the next line will not be changed.

还要注意，只有 Text 可以突出显示。 空的空间无法突出显示。 此处是尝试所有者绘制RTB子类的示例。

Also note that only Text can be highlighted. Empty space can't be highlighted afaik. Here is an example of trying to owner-draw an RTB subclass..

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