#眉標=Enterprise Library
#副標=設計模型套件系列（12）
#大標=Policy Injection Application Block（下）
#作者=文／圖	王寧疆
#引言=


==<反灰>===========
System.Windows.Forms
System.Management
System.Configuration
System.Security
==<end>==============



==<反灰>===========
using Microsoft.Practices.EnterpriseLibrary.PolicyInjection.CallHandlers.Installers;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using System.Configuration.Install;
using Microsoft.Practices.EnterpriseLibrary.PolicyInjection;
using System.Security.Principal;
using System.Threading;
using System.Data.SqlClient;
==<end>==============




==<反灰>===========
Model m = PolicyInjection.Create<Model>();	/建立PIAB欲控制的目標物件
DataTable dt=m.GetProducts(int.Parse(txtSupplierID.Text));	//呼叫物件的GetProducts方法
GridView1.DataSource = dt;	//將GetProducts方法傳回的DataTable交由GridView控制項顯示
GridView1.DataBind();	//命令GridView控制項顯示DataTable的內容
==<end>==============



==<反灰>===========
protected void btnInstall_Click(object sender, EventArgs e)
{
PerformanceCountersInstaller installer = new PerformanceCountersInstaller(new 
     SystemConfigurationSource());	//建立PerformanceCountersInstaller類別的物件
    IDictionary state = new System.Collections.Hashtable();	//建立Hashtable型態的集合
    installer.Context = new InstallContext();	//建立InstallContext類別的物件
    installer.Install(state);	//安裝所需要的效能計數器
    installer.Commit(state);	//確認安裝
    lbMessage.Text="效能計數器安裝成功!";
}

protected void btnUninstall_Click(object sender, EventArgs e)
{
    PerformanceCountersInstaller installer = new PerformanceCountersInstaller(new 
     SystemConfigurationSource());	//建立PerformanceCountersInstaller類別的物件
    installer.Context = new InstallContext();	//建立InstallContext類別的物件
    installer.Uninstall(null);	//解除所安裝的效能計數器
    lbMessage.Text="效能計數器解除安裝成功!"; 
}
==<end>==============




==<反灰>===========
Model m = PolicyInjection.Create<Model>();	//建立PIAB欲控制的目標物件
try
{
    m.UpdateProduct(int.Parse(txtUpdateProductID.Text), txtProductName.Text, 
     decimal.Parse(txtUnitPrice.Text));	//呼叫物件的UpdateProduct方法
}
catch (Exception ex)
{
    Label1.Text = ex.Message; 
} 
==<end>==============




==<反灰>===========
Model m = PolicyInjection.Create<Model>(); 
try
{
    m.DeleteProduct(int.Parse(txtProductID.Text));		//呼叫物件的DeleteProduct方法
}
catch (ApplicationException ex)	//處理型態為ApplicationException類別的例外
{
    lbError.Text = ex.Message;	//將例外資訊顯示在網頁上的Label控制項
}
catch (Exception ex)	//處理型態為Exception類別的例外
{
    lbError.Text = "使用者未具備刪除資料庫記錄的權限!"; 
}
==<end>==============




==<反灰>===========
GenericIdentity MyIdentity = new GenericIdentity("John");		//依據使用者名稱建立GenericIdentity類別的物件
string[] MyStringArray = {"Clerk"};	//準備使用者角色的名稱
GenericPrincipal MyPrincipal = new GenericPrincipal(MyIdentity, MyStringArray);	//指定使用者的角色
Thread.CurrentPrincipal = MyPrincipal;	//改變目前執行緒的執行者身份
==<end>==============



==<反灰>===========
string[] MyStringArray = {"Clerk"};								
==<end>==============




==<反灰>===========
string[] MyStringArray = {"Manager"};
==<end>==============




==<反灰>===========
DELETE 陳述式與 REFERENCE 條件約束 "FK_Order_Details_Products" 衝突。衝突發生在資料庫 "Northwind"，資料表 "dbo.Order Details", column 'ProductID'。陳述式已經結束。
==<end>==============




==<反灰>===========
public class Model
{
　　[CachingCallHandler(0, 0, 20)]
    public DataTable GetProducts(int SupplierID)
    {
       //code
    }
}
==<end>==============




==<反灰>===========
public interface ICustomerInterface
{
    DataTable GetCustomerList();
}
==<end>==============




==<反灰>===========
public class InterfaceCustomerModel : ICustomerInterface
{
    public DataTable GetCustomerList()
    {
        //code
    }
}
==<end>==============




==<反灰>===========
ICustomerInterface customers = PolicyInjection.Create<InterfaceCustomerModel, ICustomerInterface>();
==<end>==============