如何在C＃中的富文本框中使某些文本变为粗体 [英] How to make some text bold in a rich text box in C#

问题描述

我想创建一个文本编辑器，在其中可以使文本加粗，更改其颜色等。

I want to create a text editor where I can make text bold, change its color, etc.

我发现此代码可以正常工作：

I found this code to approximately work:

public static void BoldSelectedText(RichTextBox control)
{
     control.SelectionFont = new Font(control.Font.FontFamily, control.Font.Size,         FontStyle.Bold);
}

但是当我在 RichTextBox中键入更多字母时文本仍为粗体。

But when I type in more letters in the RichTextBox the text is still bold.

如何使文本变为仅选中的文本为粗体，而下一个字符为非选择文本并单击使粗体按钮？

How can I make it so that only the selected text is bold and the next characters aren't unless I select the text and hit the "Make Bold" button?

推荐答案

您应在选择后将字体设置为原始字体。

You should set the font after the selection to the original font.

如果需要，可以保存 SelectionStart 和 SelectionLength ，然后调用 Select 方法再次选择文本。

If you want you can save the SelectionStart and SelectionLength and call the Select method to select the text again.

// Remember selection
int selstart = control.SelectionStart;
int sellength = control.SelectionLength;

// Set font of selected text
// You can use FontStyle.Bold | FontStyle.Italic to apply more than one style
control.SelectionFont = new Font(control.Font, FontStyle.Bold);

// Set cursor after selected text
control.SelectionStart = control.SelectionStart + control.SelectionLength;
control.SelectionLength = 0;
// Set font immediately after selection
control.SelectionFont = control.Font;

// Reselect previous text
control.Select(selstart, sellength);

这样，文本保持选中状态，并且之后的字体仍然正确。

this way the text stays selected, and the font afterwards is still correct.

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