代码中加这个是什么意思？

[zhouyanlizyl]

别人的码中加了如下内容是什么意思：为什么要加这个，Serializable有什么用？
[Serializable]
public class TemplateConfiguration
{
#region members

/// <summary>
/// The base folder of the templates, if any.
/// </summary>
private string baseDirectory;

/// <summary>
/// The SMTP server to be used.
/// </summary>
private string smtpServer;

/// <summary>
/// The available template groups.
/// </summary>
private ArrayList templateGroups;

#endregion

#region properties

/// <summary>
/// The base folder of the templates, if any.
/// </summary>
[XmlElement()]
public string BaseDirectory
{
get
{
return System.Configuration.ConfigurationSettings.AppSettings["MailTemplateBaseDirectory"];//不是前面已经有了这句了吗？怎么这里还要呢？
}
set
{
this.baseDirectory = value;
}
}

/// <summary>
/// The SMTP server to be used.
/// </summary>
[XmlElement()]
public string SmtpServer
{
get
{
return this.smtpServer;
}

set
{
this.smtpServer = value;
}
}


/// <summary>
/// The available template groups.
/// </summary>
[XmlArray("Groups")]
[XmlArrayItem("TemplateGroup", typeof(TemplateGroupElement))]
public ArrayList TemplateGroups
{
get
{
return this.templateGroups;
}

set
{
this.templateGroups = value;
}
}

[zhouyanlizyl]

如上红色内容

[伤心的小水沟]

这些都是特性，我不知道这些， 我知道在写WebService的时候每个方法前都得加[WebMothod],作用就是大概说这是一个外部可以调用的方法。

[kkun_3yue3]

都是特性
http://www.kuqin.com/dotnet/20080628/10196.html

[ViewStates]

Attribute
Serializable 可序列化

[java343837022]

支持序列化
支持xml