blocks|key|1446938|text|这是generic+type+parameter的符号。它也可以是其他的东西，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1446939|public+class+SomeBase<GenericThingy>+where+GenericThingy+:+SomeBase<GenericThingy>,+new()|code-block|syntax|javascript|1446940|只有T是Microsoft使用和鼓励使用的默认设置。|1446941|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/512aeb7t.aspx^0|2|M|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

It's a symbol for a <a href="http://msdn.microsoft.com/en-us/library/512aeb7t.aspx" rel="noreferrer">generic type parameter</a>. It could just as well be something else, for example:

<pre><code>public class SomeBase&lt;GenericThingy&gt; where GenericThingy : SomeBase&lt;GenericThingy&gt;, new()
</code></pre>

Only T is the default one used and encouraged by Microsoft.

blocks|key|1661506|text|T本身不是关键字，而是泛型类型的占位符。查看微软的Introduction+to+Generics|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1661507|等效的VB.Net语法为：|1661508|Public+Class+SomeBase(Of+T+As+{Class,+New}))|code-block|syntax|javascript|1661509|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx^0|P|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

T is not a keyword per-se but a placeholder for a generic type. See Microsoft's <a href="http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx" rel="noreferrer">Introduction to Generics</a>

The equivalent VB.Net syntax would be:

<pre><code>Public Class SomeBase(Of T As {Class, New}))
</code></pre>

blocks|key|1447004|text|使用另一个名称代替T+would的一个很好的例子是散列表类，例如|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1447005|public+class+Dictionary<K,V>+...|code-block|syntax|javascript|1447006|其中K代表键，V代表值。我认为T代表类型。|1447007|您可能已经在周围看到过这个。如果你能做到这一点，这将是非常有帮助的。|1447008|entityMap^0|B|5|0|0|2|1|7|1|F|1|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

A good example of another name used instead of T <code>would</code> be the hash table classes, e.g.

<pre><code>public class Dictionary&lt;K,V&gt; ...
</code></pre>

Where <code>K</code> stands for Key and <code>V</code> for value. I think <code>T</code> stands for type.

You might have seen this around. If you can make the connection, it should be fairly helpful.

blocks|key|1661922|text|这将是一个“通用”。正如人们已经提到的，这个概念有一个Microsoft+explanation。至于为什么要用"T“--参见this+question。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1661923|简而言之，它允许您创建专用于特定类型的类/方法。一个典型的例子是System.Collections.Generic.List<T>类。除了它只允许存储T类型的项之外，它与System.Collections.ArrayList相同。这提供了类型安全--你不能(无意或无意地)将错误类型的项目放入列表中。System.Collections.Generic名称空间包含其他几种不同的集合类型，它们都利用了这一点。|style|CODE|1661924|至于你可以在哪里使用它--这取决于你。有很多用例会不时出现。大多数情况下，它是某种自制的集合(当内置的集合不够用时)，但它实际上可以是任何东西。|1661925|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx|1|https://stackoverflow.com/questions/374014/why-do-generics-often-use-t^0|R|L|0|1R|D|1|0|W|Y|24|1|2E|S|48|Q|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]|$A|13|B|14|F|G]|$A|15|B|16|F|G]|$A|17|B|18|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]]]

That would be a "Generic". As people have already mentioned, there is a <a href="http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx" rel="nofollow noreferrer">Microsoft explanation</a> of the concept. As for why the "T" - see <a href="https://stackoverflow.com/questions/374014/why-do-generics-often-use-t">this question</a>.

In a nutshell, it allows you to create a class/method which is specialized to a specific type. A classical example is the <code>System.Collections.Generic.List&lt;T&gt;</code> class. It's the same as <code>System.Collections.ArrayList</code>, except that it allows you to store only item of type <code>T</code>. This provides type safety - you can't (accidentally or otherwise) put items of the wrong type in your list. The <code>System.Collections.Generic</code> namespace contains several other different collection types which make use of this.

As for where you could use it - that's up to you. There are many use-cases which come up from time to time. Mostly it's some kind of a self-made collection (when the builtin ones don't suffice), but it could really be anything.

blocks|key|1661577|text|最好的方法是让你自己熟悉“泛型”，web上的许多资源，这里是one|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1661578|T不是一个关键字，而是一个名称，据我所知，它可以是任何东西，但T是约定(当只需要一种类型时，coruse)|1661579|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx^0|U|3|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Best way would be to get yourself familiar with "Generics", many resources on the web, here's <a href="http://msdn.microsoft.com/en-us/library/ms379564(vs.80).aspx" rel="nofollow noreferrer">one</a>

T is not a keyword but a name, could be anything really as far as I know, but T is the convention (when only one type is needed, of coruse)

blocks|key|1661854|text|T是泛型类中类型参数的名称。它代表"Type“，但你也可以叫它”Alice“。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1661855|您可以使用泛型以类型安全的方式提高可重用性，而无需不必要的重复代码。因此，您不需要为ListOfIntegers、ListOfStrings、ListOfChars、ListOfPersons等编写类，而是可以编写一个泛型类List<T>，然后实例化List<Int32>、List<string>、List<char>和List<Person>类型的对象。编译器会帮你完成这项工作。|1661856|entityMap^0|0|1|0|16|E|1L|D|1Z|B|2B|D|34|7|3H|B|3T|C|46|A|4H|C|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|I|$]]

The <code>T</code> is the name for the type parameter in a generic class. It stands for "Type" but you could just as well call it "Alice."

You use generics to increase reusability in a type-safe manner without needlessly duplicating code. Thus, you do not need to write classes for <code>ListOfIntegers</code>, <code>ListOfStrings</code>, <code>ListOfChars</code>, <code>ListOfPersons</code> and so on but can instead write a generic class <code>List&lt;T&gt;</code> and then instantiate objects of types <code>List&lt;Int32&gt;</code>, <code>List&lt;string&gt;</code>, <code>List&lt;char&gt;</code> and <code>List&lt;Person&gt;</code>. The compiler does the work for you.

blocks|key|1661461|text|它的意思是“任何类”。它可以是"B"，"A"，随便什么。我认为使用T是因为“模板”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1661462|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|$]]

It means "any class". It could be "B", "A", whatever. I think T is used because of "Template"

I have a VB background and I'm converting to C# for my new job. I'm also trying to get better at .NET in general. I've seen the keyword "T" used a lot in samples people post. What does the "T" mean in C#? For example:

<pre><code>public class SomeBase&lt;T&gt; where T : SomeBase&lt;T&gt;, new()
</code></pre>

What does <code>T</code> do? Why would I want to use it?

What does "T" mean in C#?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有VB背景，我正在为我的新工作转换成C#。总的来说，我也在努力在.NET上做得更好。我在人们发布的示例中看到过很多关键词"T“。在C#中"T“是什么意思？例如：public class SomeBase<T> where T : SomeBase<T>, new()T是做什么的？我为什么要用它呢？

问在C#中"T“是什么意思？
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