为什么标签控件不能将DIV呈现为HTML（AllowHtmlString = true）

Question

I want to center some of the strings.

I saw it.

https://documentation.devexpress.com/WindowsForms/9536/Controls-and-Libraries/Editors-and-Simple-Controls/Simple-Editors/Examples/How-to-Format-Text-in-LabelControl-Using-HTML-Tags

So, I wrote this code.

        labelControl1.Text = "<div style=\"text-align:center;\">center</div><br>" +
                                    "<size=14>Size = 14<br>" +
                                    "Bold <i>Italic</i> <u>Underline</u><br>" +
                                    "<color=255, 0, 0>Sample Text</color></size>";
        labelControl1.AllowHtmlString = true;
        labelControl1.Appearance.TextOptions.WordWrap = WordWrap.Wrap;
        labelControl1.Appearance.Options.UseTextOptions = true;
        labelControl1.AutoSizeMode = LabelAutoSizeMode.Vertical;

But, it didn't work.

What is the problem with it?

Answer 1

According to the documentation , only specific HTML tags are supported, and div is not in the list.

Depending on your requirements, you might split the text into two labels, one centered (AutoSize=False, TextAlign=MiddleCenter) and one with HTML.

Answer 2

According to HTML Text Formatting documentation , LabelControl.AllowHtmlString property support these tags and "pseudotags" (tags which not exist in current HTML standard but can be used for rendering purpose in label control):

Normal HTML tags

• <b> - bold text

• <i> - italic text

• <s> - strikethrough

• <u> - underline

• <br> (current HTML equivalent is <br /> )

Pseudotags

• <color> (equivalent to CSS color )

• <backcolor> (equivalent to CSS background-color )

• <size> (equivalent to CSS font-size )

• <image=value> (equivalent to HTML <img src="value"> )

• <href=url> (equivalent to HTML <a href="url"> )

• <nbsp> (equivalent to HTML   )

The HTML <div> tag is not included in supported tags mentioned above, hence it will rendered as standard text instead.