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建立时间:2008年8月31日 |
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 浅谈BlogEngine扩展机制的实现
文章收藏, 随笔, 电脑与网络
david_shar 发表于 2008/9/3 0:44:08 |
| 在Blogengine里，每一个扩展的Class都必须有Extension标记ExtensionAttribute是一个密封类，继承自System.Attribute,System.Attribute没有任何实现，只是一个标记而已。ExtensionAttribute类的代码:(完整代码可以从BlogEngine.NET.zip下载)
[AttributeUsage(AttributeTargets.Class)] //指明该Attrubite只能应用于Class上
public sealed class ExtensionAttribute : System.Attribute
{
/// <summary>
/// Creates an instance of the attribute and assigns a description.
/// </summary>
public ExtensionAttribute(string description, string version, string author)
{
_Description = description;
_Version = version;
_Author = author;
}
private string _Description;
/// <summary>
/// Gets the description of the extension.
/// </summary>
public string Description
{
get { return _Description; }
}
private string _Version;
/// <summary>
/// Gets the version number of the extension
/// </summary>
public string Version
{
get { return _Version; }
}
private string _Author;
/// <summary>
/// Gets the author of the extension
/// </summary>
public string Author
{
get { return _Author; }
}
} [AttributeUsage(AttributeTargets.Class)] //指明该Attrubite只能应用于Class上
public sealed class ExtensionAttribute : System.Attribute
{
/// <summary>
/// Creates an instance of the attribute and assigns a description.
/// </summary>
public ExtensionAttribute(string description, string version, string author)
{
_Description = description;
_Version = version;
_Author = author;
}
private string _Description;
/// <summary>
/// Gets the description of the extension.
/// </summary>
public string Description
{
get { return _Description; }
}
private string _Version;
/// <summary>
/// Gets the version number of the extension
/// </summary>
public string Version
{
get { return _Version; }
}
private string _Author;
/// <summary>
/// Gets the author of the extension
/// </summary>
public string Author
{
get { return _Author; }
}
}
到这里很明了了，扩展类决定于它有没有打Extension标记，是否创建实例取决于该扩展有没有被启用.BlogEngine有很多地方是值得我们学习的. |
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