BDC 编程模型
上次修改时间: 2010年4月15日
适用范围: SharePoint Server 2010
在示例 BDC 模型中,介绍了 Customer 外部内容类型。假定 Customer 外部内容类型的结构显示为 Customer (Name, ID, Phone no., Address),其中地址是另一个复杂类型。
在您为给定外部数据源的 Customer 外部内容类型定义模型,并将该模型保存在 BDC 元数据存储中之后,无论后端是数据库、Web 服务还是 .NET 连接器程序集,BDC 代码都可用于与显示方式相同的 Customer 外部内容类型进行交互(创建、读取、更新和删除)。此编程模式的主要好处是:不管应用程序尝试交互的外部数据源的类型如何,代码的外观将保持不变。
示例:在外部数据源中创建 Customer 实例的 BDC 代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint.BusinessData.SharedService;
using Microsoft.BusinessData.MetadataModel;
using Microsoft.BusinessData.Runtime;
using Microsoft.SharePoint.Administration;
using Microsoft.SharePoint;
using System.Web;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
using (SPSite site = new SPSite("http://ssdk-server/Pages/Default.aspx"))
{
using (new Microsoft.SharePoint.SPServiceContextScope(SPServiceContext.GetContext(site)))
{
BdcService service = SPFarm.Local.Services.GetValue<BdcService>(String.Empty);
IMetadataCatalog catalog = service.GetDatabaseBackedMetadataCatalog(SPServiceContext.Current);
IEntity entity = catalog.GetEntity("http://ssdk-server/sdksamples", "Customer");
ILobSystemInstance LobSysteminstance = entity.GetLobSystem().GetLobSystemInstances()[0].Value;
IView createView = entity.GetCreatorView("Create");
IFieldValueDictionary valueDictionary = createView.GetDefaultValues();
valueDictionary["Name"] = "some name";
Identity id = entity.Create(valueDictionary, LobSysteminstance);
}
}
}
}
}
示例:在客户端上的 BCS 客户端缓存中枚举 Customer 实例的 BDC 代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.BusinessData.MetadataModel;
using Microsoft.BusinessData.Runtime;
using Microsoft.Office.BusinessData.MetadataModel;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
RemoteSharedFileBackedMetadataCatalog RemoteCatalog = new RemoteSharedFileBackedMetadataCatalog();
IEntity remoteEntity = RemoteCatalog.GetEntity("http://ssdk-server/sdksamples", "Customer");
ILobSystemInstance LobSysteminstance = remoteEntity.GetLobSystem().GetLobSystemInstances()[0].Value;
IMethodInstance method = remoteEntity.GetMethodInstance("Read List", MethodInstanceType.Finder);
IEntityInstanceEnumerator ieie = remoteEntity.FindFiltered(method.GetFilters(), LobSysteminstance);
IView view = remoteEntity.GetFinderView(method.Name);
while (ieie.MoveNext())
{
foreach (IField field in view.Fields)
{
if (ieie.Current[field] != null)
{
Console.WriteLine(ieie.Current[field].ToString());
}
}
}
}
}
}