How to convert html special character encoding into special characters? Is there any method?

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Note: Sometimes we will encounter some special characters inexplicably: These characters can be displayed normally on the web page, but these characters are not recognized in special situations in the APP:

For example: ' ; This is actually a single quotation mark: ' ：

 class Program
    {        static void Main(string[] args)
        {            string test = "test'abc";            string a = HttpUtility.HtmlDecode(test);
            Console.WriteLine(a);
            test = "testΓabc";
            a = HttpUtility.HtmlDecode(test);
            Console.WriteLine(a);
            a = HttpUtility.HtmlDecode("a   r");
            Console.WriteLine(a);

            Console.Read();
        }
    }

Rendering:

Others:

HTML special character encoding comparison table

##电影电影#电影代们##单进制制造##ΑΒΕΘ##ΚΚ# 922;ΛΛΛΜΜ 924;ΝΝΝΞΞΞΟΟΟΡΥΨ ;##αααβββγγγδδδε #εεζζζ ι##κκκ λλλμμμ #νννξξξοοο ςυψϒ…##′′′″″″‾‾‾ℑ##ℜℜℜ™™ ™ℵℵℵ#←#← ←↑↑↑→→ →

		十进制周京	特许发	十进制制造		##Α	#Α	Β
Β	Γ	Γ	#Γ		Δ	Δ	Δ	Ε
Ε	Ζ	Ζ	Ζ		Η	Η	Η	Θ
Θ	Ι	Ι	Ι
				##Π	Π	Π	Ρ	Ρ
Σ	Σ	Σ		#Τ	Τ	Τ	#Υ	Υ
Φ	Φ	Φ		#Χ	Χ	Χ	Ψ	Ψ
Ω	Ω	Ω
			## η	η	η	θ	θ	θ
ι	ι
		##π	π	π	ρ	ρ	ρ	ς
ς		σ	σ	σ	τ	τ	τ	υ
υ		#φ	φ	φ	χ	χ	χ	ψ
ψ		#ω	ω	#ω	ϑ	ϑ	ϑ	ϒ
#ϒ		#ϖ	ϖ	ϖ	•	&bull ;	•	…
…
	##⁄	⁄	⁄	℘	℘	℘	ℑ	ℑ
↓	↓	↓	↔	↔	↔	↵	↵	↵
⇐	⇐	⇐	⇑	⇑	⇑	⇒	⇒	⇒
⇓	⇓	⇓	⇔	⇔	⇔	∀	∀	∀
∂	∂	∂	∃	∃	∃	∅	∅	∅
∇	∇	∇	∈	∈	∈	∉	∉	∉
∋	∋	∋	∏	∏	∏	∑	∑	−
−	−	−	∗	∗	∗	√	√	√
∝	∝	∝	∞	∞	∞	∠	∠	∠
∧	∧	⊥	∨	∨	⊦	∩	∩	∩
∪	∪	∪	∫	∫	∫	∴	∴	∴
∼	∼	∼	≅	≅	≅	≈	≈	≅
≠	≠	≠	≡	≡	≡	≤	≤	≤
≥	≥	≥	⊂	⊂	⊂	⊃	⊃	⊃
⊄	⊄	⊄	⊆	⊆	⊆	⊇	⊇	⊇
⊕	⊕	⊕	⊗	⊗	⊗	⊥	⊥	⊥
⋅	⋅	⋅	⌈	⌈	⌈	⌉	⌉	⌉
⌊	⌊	⌊	⌋	⌋	⌋	◊	◊	◊
♠	♠	♠	♣	♣	♣	♥	♥	♥
♦	♦	♦				¡	¡	¡
¢	¢	¢	£	£	£	¤	¤	¤
¥	¥	¥	¦	¦	¦	§	§	§
¨	¨	¨	©	©	©	ª	ª	ª
«	«	«	¬	¬	¬		­	­
®	®	®	¯	¯	¯	°	°	°
±	±	±	²	²	²	³	³	³
´	´	´	µ	µ	µ	"	"	"
<	<	<	>	>	>	'		'

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