如何使丰富的文本框C＃的一些文本加粗 [英] How to make some text bold in a rich text box C#

问题描述

我想打一个文本编辑器，我可以大胆的，改变颜色等等等等

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

我发现这个代码工作大致为：

I found this code to work roughly:

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

但是当我尝试在更多字母输入到RTF它仍然是大胆..

But when I try to type in more letters to the rtf it is still bold..

我怎么可以这样做只对选定的文本是要大胆而不会在下一行，除非我选择文本和推大胆按钮。

How can I do so only the selected text is going to bold and the next lines wont unless I select the text and push "Make Bold" button.

推荐答案

您应该选择原来的字体后，设置字体。

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

control.SelectionFont = new Font(control.Font, FontStyle.Bold);
control.SelectionStart = control.SelectionStart + control.SelectionLength;
control.SelectionLength = 0;
control.SelectionFont = control.Font;

如果你愿意，你可以保存SelectionStart和SelectionLength并调用选择功能再次选择文本。

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

int selstart = control.SelectionStart;
int sellength = contorl.SelectionLength;
// ... previous code
control.Select(selstart, sellength);

这样的文字保持选定的，事后的字体仍然是正确的。

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

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