blocks|key|257629|text|DataContractAttribute类位于System.Runtime.Serialization命名空间中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|257630|您应该添加一个对System.Runtime.Serialization.dll的引用。但是该程序集在默认情况下不会被引用。若要将引用添加到项目中，必须转到解决方案资源管理器中的References+->+add+reference，然后手动添加程序集引用。|257631|entityMap^0|0|L|O|S|0|8|W|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

<code>DataContractAttribute</code> Class is in the <code>System.Runtime.Serialization</code> namespace.

You should add a reference to <code>System.Runtime.Serialization.dll</code>. That assembly isn't referenced by default though. To add the reference to your project you have to go to References -> Add Reference in the Solution Explorer and add an assembly reference manually.

blocks|key|252726|text|http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|252727|DataContractAttribute在System.Runtime.Serialization命名空间中，您应该引用System.Runtime.Serialization.dll。它仅在.Net+>=+3中可用|252728|entityMap|0|LINK|mutability|MUTABLE|url^0|0|2N|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@$A|N|B|O|1|P]]|C|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|4]]]]

<a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx">http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx</a>

DataContractAttribute is in System.Runtime.Serialization namespace and you should reference System.Runtime.Serialization.dll. It's only available in .Net >= 3

blocks|key|252734|text|在System.ServiceModel.dll中的System.ServiceModel命名空间中可以找到DataContract和DataMember属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|252735|System.ServiceModel使用System和System.Runtime.Serialization名称空间来序列化数据成员。|252736|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|$]]

[DataContract] and [DataMember] attribute are found in System.ServiceModel namespace which is in System.ServiceModel.dll .

System.ServiceModel uses the System and System.Runtime.Serialization namespaces to serialize the datamembers.

blocks|key|252738|text|首先，我将引用添加到模型中，然后在代码中使用它们。您应该添加两个引用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|252739|使用System.ServiceModel的|252740|；|blockquote|252741|252742|使用System.Runtime.Serialization；|252743|252744|然后，这个问题在我的程序中得到了解决。我希望这个答案能帮助你。谢谢。|252745|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|S|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

First, I add the references to my Model, then I use them in my code. There are two references you should add:

<blockquote>
 using System.ServiceModel; 
 using System.Runtime.Serialization;
</blockquote>

then, this problem was solved in my program. I hope this answer can help you. Thanks.

blocks|key|254407|text|在visual+studio+for+.Net+4.0框架中，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|254408|254409|尝试将新引用添加到项目。|ordered-list-item|254410|On+.Net选项卡，Search+System.Runtime.Serialization。|offset|length|style|CODE|254411|现在，你可以使用using+System.Runtime.Serialization了。并且不会显示该错误。|254412|254413|entityMap^0|0|0|0|I|S|0|8|Y|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|T|8|@$H|U|I|V|J|K]]|9|@]|A|$]]|$1|L|3|M|5|E|7|W|8|@$H|X|I|Y|J|K]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

In visual studio for .Net 4.0 framework, 

<ol>
<li>Try to add new reference to project. </li>
<li>On .Net Tab, Search <code>System.Runtime.Serialization</code>. </li>
<li>Now, you can use <code>using System.Runtime.Serialization</code>. And the error will not be shown. </li>
</ol>

blocks|key|2938752|text|我通过在引用中添加C:\Program+Files+(x86)\Reference+Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Runtime.Serialization.dll解决了这个问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2938753|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|$]]

I solved this problem by adding C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Runtime.Serialization.dll in the reference

I can't find the namespace to use for <code>[DataContract]</code> and <code>[DataMember]</code> elements. According to what I've found, it seems that adding the following should be enough, but in my case it is not.

<pre><code>using System;
using System.Runtime.Serialization;
</code></pre>

Here is a snippet of my code:

<pre><code>using System;
using System.Runtime.Serialization;

namespace MyNamespace {

 [DataContract]
 public class Tuple&lt;T1, T2&gt; {
 // A custom implementation of a Tuple
 //...
 //...
 }
}
</code></pre>

And the error I get:

<blockquote>
 The type or namespace name 'DataContract' could not be found (are you missing a using directive or an assembly reference?)
</blockquote>

Am I not using the right namespaces?

Namespace for [DataContract]

我找不到用于[DataContract]和[DataMember]元素的名称空间。根据我所发现的，添加以下内容似乎就足够了，但在我的例子中却不够。using System;using System.Runtime.Serialization;下面是我的代码片段：using System;using System.Run...

问[DataContract]的命名空间
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