FilterDescriptor 类 (Microsoft.Office.Server.ApplicationRegistry.MetadataModel)

Filters are the fundamental way in which the Business Data Catalog captures user (or system) input and plumbs it through to the backend API invocation. FilterDescriptors describe where in a complex series of parameters, a filter value should be inserted. This is accomplished by 'tagging' the TypeDEscriptors representing complex parameters of a Method definition to flag where the insertion should happen. It is important to note that the backend must supply the functionality for filtering; the FilterDescriptors merely form a mechanism to surface this to the end user. FilterDescriptor objects are owned (contained) inside Method objects. They are subsequently referred by TypeDescriptor objects.

命名空间: Microsoft.Office.Server.ApplicationRegistry.MetadataModel
程序集: Microsoft.SharePoint.Portal （在 microsoft.sharepoint.portal.dll 中）

语法

声明
<SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel:=True)> _
<SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel:=True)> _
Public Class FilterDescriptor
    Inherits MetadataObject
用法
Dim instance As FilterDescriptor

[SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel=true)] 
[SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel=true)] 
public class FilterDescriptor : MetadataObject

备注

Users may want to retrieve the instances of an entity that match some criteria. For example, a user may want to display the customers whose names begin with "A" or the orders made by a certain customer. The API used to retrieve customers requires that this user input be passed in as the third String parameter in the invocation. The metadata author will create a FilterDescriptor of a Wildcard Type, and then tag the third parameter's root TypeDescriptor with this newly created FilterDescriptor. Many such FilterDescriptors may be associated with a single Method (API).Users then choose the filter they want at run time, specify a value for it, and the Business Data Catalog passes that filter's value to the back-end method, inserting it into the exact location where the backend expects it, which causes it to then returns only the rows the user wants to see.

继承层次结构

System.Object
   Microsoft.Office.Server.ApplicationRegistry.MetadataModel.MetadataObject
    Microsoft.Office.Server.ApplicationRegistry.MetadataModel.FilterDescriptor

线程安全性

此类型的任何公共静态（在 Visual Basic 中共享）成员是线程安全的。不保证任何实例成员都是线程安全的。

另请参阅

参考

FilterDescriptor 成员
Microsoft.Office.Server.ApplicationRegistry.MetadataModel 命名空间