Winform 富文本框字体高亮

1.RichTextBox 控件 - Windows Forms .NET Framework | Microsoft Learn

2.c# 代码编辑控件(代码着色控件) ICSharpCode.TextEditor 简单应用示例_风雪子郁的博客-CSDN博客

3.Fast Colored TextBox for Syntax Highlighting - CodeProject

展示效果

 二：ICSharpCode.TextEditor 

1.Nuget

 2.配置文件.xshd

<SyntaxDefinition name = "JackC#" extensions = ".cs">

	<Environment>
		<Custom name="TypeReference" bold="false" italic="false" color="#04ABAB" />
		<Custom name="UnknownEntity" bold="false" italic="false" color="#AB0404" />
	</Environment>

	<Properties>
		<Property name="LineComment" value="//"/>
	</Properties>

	<Digits name = "Digits" bold = "false" italic = "false" color = "DarkBlue"/>

	<RuleSets>
		<RuleSet ignorecase="false">
			<Delimiters>&<>~!%^*()-+=|\#/{}[]:;"' ,	.?</Delimiters>


			<MarkPrevious bold = "true" italic = "false" color = "MidnightBlue">(</MarkPrevious>

			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "Blue">
				<Key word = "base" />
				<Key word = "public" />
				<Key word = "class" />
				<Key word = "string" />
				<Key word = "Ceiling" />
				<Key word = "Cos" />
				<Key word = "Exp" />
				<Key word = "Floor" />
				<Key word = "IEEERemainder" />
				<Key word = "Log" />
				<Key word = "Log10" />
				<Key word = "Max" />
				<Key word = "Min" />
				<Key word = "Pow" />
				<Key word = "*" />
				<Key word = "Round" />
				<Key word = "Sign" />
				<Key word = "Sin" />
				<Key word = "Sqrt" />
				<Key word = "Tan" />
				<Key word = "Truncate" />
			</KeyWords>


			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "Red">
				<Key word = "?" />
				<Key word = "," />
				<Key word = "." />
				<Key word = ";" />
				<Key word = "(" />
				<Key word = ")" />
				<!--<Key word = "[" />
        <Key word = "]" />-->
				<Key word = "{" />
				<Key word = "}" />
				<Key word = "+" />
				<Key word = "-" />
				<Key word = "/" />
				<Key word = "%" />
				<Key word = "*" />
				<Key word = "not" />
				<Key word = "and" />
				<Key word = "or" />
				<Key word = "<" />
				<Key word = ">" />
				<Key word = "^" />
				<Key word = "or" />
				<Key word = "=" />
				<Key word = "~" />
				<Key word = "!" />
				<Key word = "|" />
				<Key word = "&" />
			</KeyWords>



			<!--获取类函数-->
			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "#3E6776">
				<Key word = "CalcArea" />
				<Key word = "CalcRel" />
				<Key word = "GetEleValue" />
				<Key word = "GetSenValue" />
				<Key word = "GetTID" />
				<Key word = "GetCID" />
				<Key word = "GetAPID" />
				<Key word = "GetRCID" />
			</KeyWords>


			<!--类型转换-->
			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "#246AF2">
				<Key word = "ToDecimal" />
				<Key word = "ToDouble" />
				<Key word = "ToFloat" />
				<Key word = "ToInt16" />
				<Key word = "ToInt32" />
				<Key word = "ToInt64" />
				<Key word = "ToDateTime" />
				<Key word = "ToBoolean" />
				<Key word = "ToChar" />
				<Key word = "ToString" />
			</KeyWords>


			<!--专用函数-->
			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "#4297E2">
				<Key word = "Q_TriaWeir" />
				<Key word = "Q_TrapWeir" />
				<Key word = "Q_RectWeir" />
				<Key word = "Q_VAM" />
				<Key word = "VWP_P" />
				<Key word = "VWP_HW" />
				<Key word = "VWP_HA" />
				<Key word = "IsNULL" />
			</KeyWords>


			<!--测值-->
			<KeyWords name = "Punctuation" bold = "false" italic = "false" color = "#67B23B">
				<Key word = "[]" />
			</KeyWords>
		</RuleSet>
	</RuleSets>
</SyntaxDefinition>

三： Fast Colored TextBox 

1.nuget

 2.设置：