The optional element indicates that the requestor is making the request on behalf of another. It could be pointing to the signature which is using the public or it could just include a ski directly
命名空间: Microsoft.IdentityModel.Protocols.WSTrust
程序集: Microsoft.IdentityModel（microsoft.identitymodel.dll 中）
用法
Dim instance As UseKey
语法
声明
Public Class UseKey
public class UseKey
public ref class UseKey
public class UseKey
public class UseKey
继承层次结构
System.Object
Microsoft.IdentityModel.Protocols.WSTrust.UseKey
线程安全
此类型的任何公共静态（在 Visual Basic 中为 Shared）成员都是线程安全的。但不能保证任何实例成员是线程安全的。
平台
开发平台
Windows Server 2003, Windows Vista
Target Platforms
Windows Server 2008, Windows Vista, Not tested on Windows XP