ASP.NET 2.0使用Web Part创建应用程序之二

1.Web Part 通讯
Web Parts可以相互通讯,提供者发布接口,订阅者通过接口获得数据,WebPartManager 管理通讯，从提供者获得接口,向订阅者发布接口,通讯可以是静态的，也可以是动态的,ConnectionsZone 提供后期绑定的UI
通讯提供者
实现方法返回接口，方法特性 [ConnectionProvider]


[ConnectionProvider ("Zip Code", "ZipCodeProvider")]


public IZipCode GetZipCodeInterface ()






{


return this; // Assumes control implements IZipCode


}




// IZipCode.GetZipCode implementation


public string GetZipCode ()






{


return _zip;


}
通讯订阅者
实现方法接收接口参数，方法特性 [ConnectionConsumer]


[ConnectionConsumer ("Zip Code", "ZipCodeConsumer")]


public void GetIZipCodeInterface (IZipCode provider)






{


string zip = provider.GetZipCode (); // Get zip code from provider






}
静态通讯方式
在 WebPartManager的 <StaticConnections> 元素中定义，最终用户无法修改


<asp:Connection>的实例


<asp:WebPartManager ID="WebPartManager1" Runat="server">


<StaticConnections>


<asp:Connection ID="ZipCodeConnection" Runat="server"


ProviderID="Weather1" ProviderConnectionPointID="ZipCodeProvider"


ConsumerID="News1" ConsumerConnectionPointID="ZipCodeConsumer" />


</StaticConnections>


</asp:WebPartManager>
2.ConnectionsZone 控件
提供供Web Part进行通讯的UI，最终用户，而不是开发人员创建通讯关系


<asp:ConnectionsZone ID="ConnectionsZone1"


Runat="server" />
3.Web Parts 个性化
Web Parts 个性化服务
自动保存相关Web Part的属性 (布局, 外观等等)，自动保存标记为 PersonalizableAttribute的定制属性
PersonalizationAdministration 类提供个性化服务的API，Provider-based for flexible data storage
Per-User 个性化，[Personalizable] 为每位用户保存定制属性，string _stocks; // e.g., "MSFT,INTC,AMZN"


[WebBrowsable]


[Personalizable]


public string Stocks






{




get

{ return _stocks; }




set

{ _stocks = value; }


}




Shared Personalization


[Personalizable (PersonalizationScope.-Shared)] persists properties on shared basis


string _stocks; // e.g., "MSFT,INTC,AMZN"




[WebBrowsable]


[Personalizable (PersonalizationScope.Shared)]


public string Stocks






{




get

{ return _stocks; }




set

{ _stocks = value; }


}



个性化服务是基于Provider模式


使用 SQL Server Provider


<configuration>


<system.web>


<webParts>


<personalization defaultProvider="AspNetSqlPersonalizationProvider" />


</webParts>


</system.web>


</configuration>
4 定制Web Parts
增加自定义操作


public class MyWebPart : WebPart






{


public override WebPartVerbCollection Verbs






{




get

{


EnsureChildControls ();


WebPartVerb verb =


new WebPartVerb (new WebPartEventHandler (OnClearResults));


verb.Text = "Clear Results";




WebPartVerb[] verbs = new WebPartVerb[]

{ verb };


return new WebPartVerbCollection (base.Verbs, verbs);


}


}






void OnClearResults (object sender, WebPartEventArgs args)

{

}






}
5.导出Web Part
WebPart.ExportMode属性，WebPartExportMode.None (默认)，WebPartExportMode.All
WebPartExportMode.NonSensitiveData，All” 及 “NonSensitiveData” 增加导出操作以便Web Part可以被导出
仅[Personalizable] 属性，PersonalizableAttribute.IsSensitive识别 “sensitive” 属性
导出所有属性


public class MyWebPart : WebPart






{


public MyWebPart ()






{


ExportMode = WebPartExportMode.All;


}






}
导出所选择的属性


public class MyWebPart : WebPart






{


public MyWebPart ()






{


ExportMode = WebPartExportMode.NonSensitiveData;


}




// This property will be exported


[Personalizable (PersonalizationScope.User, false)]


public string ZipCode






{

}




// This one will not


[Personalizable (PersonalizationScope.User, true)]


public string SocialSecurityNumber






{

}






}