blocks|key|1249611|text|它是一个带有一个参数的委托，这个参数是一个字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249612|Usefull，因为它意味着你不再需要为动作创建代理，只要你可以为它们使用一个标准的动作(即参数的数量是固定的，没有默认值，你可以只使用一个现有的动作)。|1249613|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

It is a delegate with one parameter, this being a string.

Usefull because it means you do not have to create delegates anymore for actions as long as you can use a standard action for them (i.e. the number of parameters is fixed, no default values and you can just use an existing action).

blocks|key|1249677|text|下面是Action的一个简单的小介绍：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249678|http://www.c-sharpcorner.com/UploadFile/rmcochran/anonymousMethods04022006141542PM/anonymousMethods.aspx|offset|length|1249679|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2W|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

here is a small and easy introduction of Action:

<a href="http://www.c-sharpcorner.com/UploadFile/rmcochran/anonymousMethods04022006141542PM/anonymousMethods.aspx" rel="nofollow noreferrer">http://www.c-sharpcorner.com/UploadFile/rmcochran/anonymousMethods04022006141542PM/anonymousMethods.aspx</a>

blocks|key|1034659|text|这是具有签名void+Bla(string+parameter)的函数的委托。您可以使用它将函数传递给其他函数。例如，你可以这样做|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1034660|Action<string>+action+=+(x+=>+Console.WriteLine(x));
new+List<string>{"1","2","3"}.ForEach(action);|code-block|syntax|javascript|1034661|将所有字符打印到控制台|1034662|entityMap^0|6|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

This is a delegate to a function with the signature 
<code>void Bla(string parameter)</code>. You can use this to pass functions to other functions.
For instance you can do this

<pre><code>Action&lt;string&gt; action = (x =&gt; Console.WriteLine(x));
new List&lt;string&gt;{"1","2","3"}.ForEach(action);
</code></pre>

to print all characters to the console

blocks|key|1034748|text|它基本上只是一个不返回值的委托。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034749|看看这里：http://msdn.microsoft.com/en-us/library/018hxwa8.aspx|offset|length|1034750|Action<string>只是一个方法的委托，该方法只有一个字符串参数，不返回任何内容。|style|CODE|1034751|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/018hxwa8.aspx^0|0|5|1H|0|0|0|E|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@$D|X|E|Y|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

It is basically just a delegate that does not return a value.

Have a look here:
<a href="http://msdn.microsoft.com/en-us/library/018hxwa8.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/018hxwa8.aspx</a>

<code>Action&lt;string&gt;</code> would just be a delegate of a method that excepted a single string parameter and did not return anything.

blocks|key|1249820|text|public+void+ValidateInput(string+input)
{
+++//some+code
}

public+void+test()
{
+++Action<string>+action+=+ValidateInput;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1249821|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public void ValidateInput(string input)
{
 //some code
}

public void test()
{
 Action&lt;string&gt; action = ValidateInput;
}
</code></pre>

What is <code>Action&lt;string&gt;</code>, how can it be used?

What is Action<string>?

什么是Action<string>，如何使用？

问什么是Action<string>？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问什么是Action<string>？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问什么是Action<string>？
EN