Namespace for [DataContract]

Question

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

using System;
using System.Runtime.Serialization;

Here is a snippet of my code:

using System;
using System.Runtime.Serialization;

namespace MyNamespace {

    [DataContract]
    public class Tuple<T1, T2> {
            // A custom implementation of a Tuple
            //...
            //...
        }
}

And the error I get:

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

Am I not using the right namespaces?

Answer 1

DataContractAttribute Class is in the System.Runtime.Serialization namespace.

You should add a reference to System.Runtime.Serialization.dll . 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.

Answer 2

http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx

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

Answer 3

[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.

Answer 4

In visual studio for .Net 4.0 framework,

1. Try to add new reference to project.
2. On .Net Tab, Search System.Runtime.Serialization .
3. Now, you can use using System.Runtime.Serialization . And the error will not be shown.

Answer 5

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

using System.ServiceModel;
using System.Runtime.Serialization;

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

Answer 6

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