命名空间“System”中不存在类型或命名空间名称“Serialized”（您是否缺少程序集引用？

I am VS 2012 silverlight-5 beginner. I tried to serialize and de-serialize from a xml file. I have following error while doing this :

The type or namespace name 'Serializable' does not exist in the namespace 'System' (are you missing an assembly reference?) 
The type or namespace name 'SerializableAttribute' could not be found (are you missing a using directive or an assembly reference?)

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

我的序列化代码是：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Runtime.Serialization.Json;
using System.Runtime;
using System.Xml.Serialization;
using System.Runtime.Serialization;
using System.IO;

namespace Model.XML
{   
        public static class Serialization<T> where T : class
        {

            public static T DeserializeFromXmlFile(string fileName)
            {
                if (!File.Exists(fileName))
                {
                    return null;
                }

                DataContractSerializer deserializer = new DataContractSerializer(typeof(T));

                using (Stream stream = File.OpenRead(fileName))
                {
                    return (T)deserializer.ReadObject(stream);
                }
            }
        }

}

但我有兴趣单独拥有每个类（并非在一个类中获得所有 3 个类（参数、组件和属性））。

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Runtime.Serialization.Json;
using System.Runtime;
using System.Xml.Serialization;
using System.Runtime.Serialization;
using System.IO;
using System.Xml.Serialization.XmlTypeAttribute;
using System.Serializable;          //It gives red line under Serializable



namespace Model.XML
{
    [Serializable] //It gives red line
    public class attribute
    {
        [Datamember] //It gives red line
        public string name { get; set; }

        [Datamember] //It gives red line
        public string label { get; set; }

        [Datamember] //It gives red line
        public string unit { get; set; }

        [Datamember] //It gives red line
        public component thisComponent { get; set; }
    }
}

我试图参考using System.Serializable;但它在我的 VS2012 的 dll 列表中不可用。 问题的原因是什么以及如何解决它？提前致谢。

评论后编辑：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Runtime.Serialization.Json;
using System.Runtime;
using System.Xml.Serialization;
using System.Runtime.Serialization;
using System.IO;
using System.Collections.Generic;


namespace Model.XML
{
    [DataContract]
    public class attribute
    {
        [DataMember]
        public string type { get; set; }

        [DataMember]
        public string displayed { get; set; }

        [DataMember]
        public string add_remove { get; set; }

        [DataMember]
        public string ccypair { get; set; }

        [DataMember]
        public List<int> item { get; set; }

        public static void Main()
        {
            attribute Obj1 = Serialization<attribute>.DeserializeFromXmlFile("C:\\Users\\SHEK\\Desktop\\VannakNew\\DEV_CENTER\\Model\\XML\\XmlParameter.xml");
         // Obj1.type = "shekhar";

        }

    }
}

而serialization.cs是：

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Runtime.Serialization.Json;
using System.Runtime;
using System.Xml.Serialization;
using System.Runtime.Serialization;
using System.IO;

namespace Model.XML
{   
        public static class Serialization<T> where T : class
        {

            public static T DeserializeFromXmlFile(string fileName)
            {
                if (!File.Exists(fileName))
                {
                    MessageBox.Show("File Path is wrong");
                    return null;
                }

                DataContractSerializer deserializer = new DataContractSerializer(typeof(T));

                using (Stream stream = File.OpenRead(fileName))
                {
                    return (T)deserializer.ReadObject(stream);
                }
            }
        }

}

Xml文件是XmlParameter.xml

<?xml version="1.0" encoding="utf-8" ?>
<parameter>
  <name>bands_amounts</name>
  <label>Bands Amounts</label>
  <unit></unit>
  <component>
    <type>List</type>
    <attributes>
      <type>Integer</type>
      <displayed>4</displayed>
      <add_remove>yes</add_remove>
      <item>1 000 000</item>
      <item>5 000 000</item>
      <item>10 000 000</item>
      <item>20 000 000</item>
    </attributes>
    <attributes>
      <ccypair>XAUUSD</ccypair>
      <item>100</item>
      <item>500</item>
      <item>1000</item>
    </attributes>
  </component >
</parameter>

**它工作正常，但我想知道为什么它总是空对象（在调试时），即使 XmlParameter.xml 文件的路径是正确的。是因为使用“[DataContract]”而不是[Serialized]吗？因为它是 silverlight 应用程序。实际上我必须显示节点内的元素，例如，我必须显示"XAUUSD" in my attribute.cs节点中存在的类<ccypair>XAUUSD</ccypair> **

没有System.Serializable命名空间；这SerializableAttribute类是在System命名空间。你应该只写using System;.

我认为你混淆了 C#usingJava 语句import陈述。在 Java 中，您可以导入特定的类（或使用以下命令导入包中的所有类）*）。在 C# 中，using语句导入指定命名空间中的所有类型。

目前，在之后指定类名using是一个错误，但在 C# 6 中这是可能的，并且将从类中导入所有静态成员。

其他问题：你写的Datamember代替DataMember; C# 区分大小写。无论如何，DataMember对没有的类没有影响DataContract属性。

还要确保您已引用System.Runtime.Serialization集会。