blocks|key|415046|text|这个链接有一个很好的解释：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|415047|http://unicode.org/reports/tr15/#Norm_Forms|offset|length|415048|根据我的猜测，这是为了让你可以比较两个unicode字符串是否相等。|415049|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|17|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

This link has a good explanation:

<a href="http://unicode.org/reports/tr15/#Norm_Forms" rel="noreferrer">http://unicode.org/reports/tr15/#Norm_Forms</a>

From what I can surmise, its so you can compare two unicode strings for equality.

blocks|key|412423|text|它确保可以比较unicode字符串是否相等(即使它们使用不同的unicode编码)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412424|来自Unicode标准Annex+#15|offset|length|412425|412426|本质上，Unicode规范化算法将所有组合标记按指定顺序放置，并使用分解和组合规则将每个字符串转换为Unicode规范化形式之一。然后，对转换后的字符串进行二进制比较，以确定等价性。|blockquote|412427|412428|entityMap|0|LINK|mutability|MUTABLE|url|http://unicode.org/reports/tr15/#Norm_Forms^0|0|B|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

It makes sure that unicode strings can be compared for equality (even if they are using different unicode encodings).

From Unicode Standard <a href="http://unicode.org/reports/tr15/#Norm_Forms" rel="noreferrer">Annex #15</a>:

<blockquote>
 Essentially, the Unicode Normalization Algorithm puts all combining marks in a specified order, and uses rules for decomposition and composition to transform each string into one of the Unicode Normalization Forms. A binary comparison of the transformed strings will then determine equivalence.
</blockquote>

blocks|key|412430|text|form+C和form+D之间的一个区别是带有重音的字母的表示方式:+form+C使用单个带有重音的字母代码点，而form+D将其分隔为字母和重音。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412431|例如，"à“可以是码点224+(”带有重音的拉丁文小写字母A")，或者码点97+(“拉丁文小写字母A”)，后跟码点786+(“组合重音”)。逐个字符的比较会发现它们是不同的。标准化使比较成功。|412432|一个副作用是，这使得创建一个“移除重音”方法成为可能。|412433|public+static+string+RemoveAccents(string+input)
{
++++return+new+string(input
++++++++.Normalize(System.Text.NormalizationForm.FormD)
++++++++.ToCharArray()
++++++++.Where(c+=>+CharUnicodeInfo.GetUnicodeCategory(c)+!=+UnicodeCategory.NonSpacingMark)
++++++++.ToArray());
++++//+the+normalization+to+FormD+splits+accented+letters+in+letters%2Baccents
++++//+the+rest+removes+those+accents+(and+other+non-spacing+characters)
++++//+and+creates+a+new+string+from+the+remaining+chars
}|code-block|syntax|javascript|412434|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

One difference between form C and form D is how letters with accents are represented: form C uses a single letter-with-accent codepoint, while form D separates that into a letter and an accent.
For instance, an &quot;à&quot; can be codepoint 224 (&quot;Latin small letter A with grave&quot;), or codepoint 97 (&quot;Latin small letter A&quot;) followed by codepoint 786 (&quot;Combining grave accent&quot;). A char-by-char comparison would see these as different. Normalisation lets the comparison succeed.
A side-effect is that this makes it possible to easily create a &quot;remove accents&quot; method.
<pre><code>public static string RemoveAccents(string input)
{
 return new string(input
 .Normalize(System.Text.NormalizationForm.FormD)
 .ToCharArray()
 .Where(c =&gt; CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
 .ToArray());
 // the normalization to FormD splits accented letters in letters+accents
 // the rest removes those accents (and other non-spacing characters)
 // and creates a new string from the remaining chars
}
</code></pre>

blocks|key|3252168|text|在Unicode中，(合成的)字符可以具有唯一的代码点，也可以具有由基本字符及其重音符号组成的代码点序列。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3252169|Wikipedia列举了越南语重音(U%2B1EBF)及其分解序列U%2B0065+(e)+U%2B0302+(扬音重音)+U%2B0301+(急性重音)的例子。|offset|length|3252170|string.Normalize()在4种范式之间进行转换，字符串可以用Unicode编码。|3252171|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Unicode_equivalence^0|0|0|9|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

In Unicode, a (composed) character can either have a unique code point, or a sequence of code points consisting of the base character and its accents.

<a href="http://en.wikipedia.org/wiki/Unicode_equivalence" rel="noreferrer">Wikipedia</a> lists as example Vietnamese ế (U+1EBF) and its decomposed sequence U+0065 (e) U+0302 (circumflex accent) U+0301 (acute accent).

string.Normalize() converts between the 4 normal forms a string can be coded in Unicode.

The <a href="http://msdn.microsoft.com/en-us/library/system.string.normalize.aspx" rel="noreferrer">MSDN article on String.Normalize</a> states simply:

<blockquote>
 Returns a new string whose binary representation is in a particular Unicode normalization form.
</blockquote>

And sometimes referring to a "Unicode normalization form C."

I'm just wondering, what does that mean? How is this function useful in real life situations?

What does .NET's String.Normalize do?

的声明很简单：返回一个新字符串，该字符串的二进制表示形式为特定的Unicode规范化形式。有时指的是"Unicode规范化形式C“。我只是在想，这是什么意思？这个函数在现实生活中有什么用呢？

问.NET的String.Normalize是做什么的？
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