blocks|key|1162826|text|ToUpper使用当前区域性。ToUpperInvariant使用不变的区域性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1162827|典型的例子是土耳其，"I“的大写字母不是"i”。|1162828|显示差异的示例代码：|1162829|using+System;
using+System.Drawing;
using+System.Globalization;
using+System.Threading;
using+System.Windows.Forms;

public+class+Test
{
++++[STAThread]
++++static+void+Main()
++++{
++++++++string+invariant+=+"iii".ToUpperInvariant();
++++++++CultureInfo+turkey+=+new+CultureInfo("tr-TR");
++++++++Thread.CurrentThread.CurrentCulture+=+turkey;
++++++++string+cultured+=+"iii".ToUpper();

++++++++Font+bigFont+=+new+Font("Arial",+40);
++++++++Form+f+=+new+Form+{
++++++++++++Controls+=+{
++++++++++++++++new+Label+{+Text+=+invariant,+Location+=+new+Point(20,+20),
++++++++++++++++++++++++++++Font+=+bigFont,+AutoSize+=+true},
++++++++++++++++new+Label+{+Text+=+cultured,+Location+=+new+Point(20,+100),
++++++++++++++++++++++++++++Font+=+bigFont,+AutoSize+=+true+}
++++++++++++}
++++++++};++++++++
++++++++Application.Run(f);
++++}
}|code-block|syntax|javascript|1162830|有关土耳其语的更多信息，请参阅此Turkey+Test+blog+post。|1162831|如果听到关于省略字符等的其他各种大小写问题，我不会感到惊讶。这只是我脑海中的一个例子……部分原因是它在几年前的Java中咬了我一口，当时我正在大写字符串，并将其与"MAIL“进行比较。在土耳其就没那么好用了。|1162832|entityMap|0|LINK|mutability|MUTABLE|url|http://www.moserware.com/2008/02/does-your-code-pass-turkey-test.html^0|0|7|F|G|0|0|0|0|G|L|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|Q|3|R|5|6|7|1C|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

<code>ToUpper</code> uses the current culture. <code>ToUpperInvariant</code> uses the invariant culture.

The canonical example is Turkey, where the upper case of "i" isn't "I".

Sample code showing the difference:

<pre><code>using System;
using System.Drawing;
using System.Globalization;
using System.Threading;
using System.Windows.Forms;

public class Test
{
 [STAThread]
 static void Main()
 {
 string invariant = "iii".ToUpperInvariant();
 CultureInfo turkey = new CultureInfo("tr-TR");
 Thread.CurrentThread.CurrentCulture = turkey;
 string cultured = "iii".ToUpper();

 Font bigFont = new Font("Arial", 40);
 Form f = new Form {
 Controls = {
 new Label { Text = invariant, Location = new Point(20, 20),
 Font = bigFont, AutoSize = true},
 new Label { Text = cultured, Location = new Point(20, 100),
 Font = bigFont, AutoSize = true }
 }
 }; 
 Application.Run(f);
 }
}
</code></pre>

For more on Turkish, see this <a href="http://www.moserware.com/2008/02/does-your-code-pass-turkey-test.html" rel="noreferrer">Turkey Test blog post</a>.

I wouldn't be surprised to hear that there are various other capitalization issues around elided characters etc. This is just one example I know off the top of my head... partly because it bit me years ago in Java, where I was upper-casing a string and comparing it with "MAIL". That didn't work so well in Turkey...

blocks|key|948765|text|ToUpperInvariant使用invariant+culture中的规则|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|948766|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.string.toupperinvariant.aspx^0|0|G|I|H|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<code>ToUpperInvariant</code> uses the rules from the <a href="http://msdn.microsoft.com/en-us/library/system.string.toupperinvariant.aspx" rel="nofollow noreferrer">invariant culture</a>

blocks|key|948798|text|英语是没有区别的。只有在土耳其文化中才能发现差异。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|948799|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

there is no difference in english. only in turkish culture a difference can be found.

In C#, what is the difference between <code>ToUpper()</code> and <code>ToUpperInvariant()</code>?

Can you give an example where the results might be different?

In C# what is the difference between ToUpper() and ToUpperInvariant()?

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在C#中，ToUpper()和ToUpperInvariant()有什么不同你能举一个结果可能不同的例子吗？

问在C#中，ToUpper()和ToUpperInvariant()有什么不同？
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