精進不休 .NET 4.0 (8) - ADO.NET Entity Framework 4.0 Self Tracking Entity
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做者： webabcd
介紹
ADO.NET Entity Framework 4.0 的新增功能
示例
一、Self Tracking Entity 的 Demo
SelfTrackingDemo/BLL.cs
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精進不休 .NET 4.0 (8) - ADO.NET Entity Framework 4.0 Self Tracking Entity
做者： webabcd
介紹
ADO.NET Entity Framework 4.0 的新增功能
- 對 Self Tracking Entity（實體狀態自跟蹤）的支持，基於 POCO
- WCF 結合 Self Tracking Entity 的應用
示例
一、Self Tracking Entity 的 Demo
SelfTrackingDemo/BLL.cs
/*
* ADO.NET Entity Framework 4.0 - 對 Self Tracking Entity（實體狀態自跟蹤）的支持，基於 POCO
* 一、不經過 WCF 使用 Self Tracking Entity 須要手動調用 StartTracking()
* 二、MarkAsAdded(), MarkAsModified(), MarkAsDeleted() 會自動 StartTracking()
* 三、ApplyChanges() 的做用是：綁定實體到上下文，經過 ChangeObjectState 改變實體的狀態，經過 ChangeRelationshipState 改變關聯實體的狀態
*
* 本 Demo 演示如何經過 Self Tracking Entity 來實現對單表的增刪改查
* 若是涉及到關聯實體，能夠參考 http://webabcd.blog.51cto.com/1787395/341378 中的「對外鍵的支持」的 Demo
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace SelfTrackingDemo
{
public class BLL
{
// 取所有產品類別的實體集合
List<ProductCategory> GetCategories() List<ProductCategory> GetCategories()
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
var result = ctx.ProductCategories.ToList();
return result;
}
}
// 根據 id 取產品類別實體
ProductCategory GetCategory() ProductCategory GetCategory(int categoryId)
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
var result = ctx.ProductCategories.Single(c => c.ProductCategoryID == categoryId);
return result;
}
}
// 根據產品類別實體更新數據庫中的相關數據
void UpdateCategory() void UpdateCategory(ProductCategory category)
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
// ApplyChanges() 的內部邏輯爲：綁定實體到上下文，經過 ChangeObjectState 改變實體的狀態，經過 ChangeRelationshipState 改變關聯實體的狀態
ctx.ProductCategories.ApplyChanges(category);
// 根據實體的狀態，實現對實體的 添加、更新、刪除 操做
var affectedRow = ctx.SaveChanges();
}
}
// 根據產品類別實體刪除數據庫中的相關數據
void DeleteCategory() void DeleteCategory(ProductCategory category)
{
// 標記該實體爲刪除狀態
category.MarkAsDeleted();
UpdateCategory(category);
}
// 根據產品類別實體向數據庫添加新的數據
void AddCategory() void AddCategory(ProductCategory category)
{
UpdateCategory(category);
}
}
}
* ADO.NET Entity Framework 4.0 - 對 Self Tracking Entity（實體狀態自跟蹤）的支持，基於 POCO
* 一、不經過 WCF 使用 Self Tracking Entity 須要手動調用 StartTracking()
* 二、MarkAsAdded(), MarkAsModified(), MarkAsDeleted() 會自動 StartTracking()
* 三、ApplyChanges() 的做用是：綁定實體到上下文，經過 ChangeObjectState 改變實體的狀態，經過 ChangeRelationshipState 改變關聯實體的狀態
*
* 本 Demo 演示如何經過 Self Tracking Entity 來實現對單表的增刪改查
* 若是涉及到關聯實體，能夠參考 http://webabcd.blog.51cto.com/1787395/341378 中的「對外鍵的支持」的 Demo
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace SelfTrackingDemo
{
public class BLL
{
// 取所有產品類別的實體集合
List<ProductCategory> GetCategories() List<ProductCategory> GetCategories()
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
var result = ctx.ProductCategories.ToList();
return result;
}
}
// 根據 id 取產品類別實體
ProductCategory GetCategory() ProductCategory GetCategory(int categoryId)
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
var result = ctx.ProductCategories.Single(c => c.ProductCategoryID == categoryId);
return result;
}
}
// 根據產品類別實體更新數據庫中的相關數據
void UpdateCategory() void UpdateCategory(ProductCategory category)
{
using (SelfTrackingEntities ctx = new SelfTrackingEntities())
{
// ApplyChanges() 的內部邏輯爲：綁定實體到上下文，經過 ChangeObjectState 改變實體的狀態，經過 ChangeRelationshipState 改變關聯實體的狀態
ctx.ProductCategories.ApplyChanges(category);
// 根據實體的狀態，實現對實體的 添加、更新、刪除 操做
var affectedRow = ctx.SaveChanges();
}
}
// 根據產品類別實體刪除數據庫中的相關數據
void DeleteCategory() void DeleteCategory(ProductCategory category)
{
// 標記該實體爲刪除狀態
category.MarkAsDeleted();
UpdateCategory(category);
}
// 根據產品類別實體向數據庫添加新的數據
void AddCategory() void AddCategory(ProductCategory category)
{
UpdateCategory(category);
}
}
}
SelfTrackingDemo/Demo.aspx
<%@ Page Language=
"C#" AutoEventWireup=
"true" CodeBehind=
"Demo.aspx.cs"
Inherits=
"SelfTrackingDemo.Demo" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns= "http://www.w3.org/1999/xhtml">
<head runat= "server">
<title></title>
</head>
<body>
<form id= "form1" runat= "server">
<div>
<asp:ListView ID= "ListView1" runat= "server" DataSourceID= "ObjectDataSource1" DataKeyNames= "ProductCategoryID"
InsertItemPosition= "LastItem" OnItemUpdating= "ListView1_ItemUpdating">
<EditItemTemplate>
<tr style="">
<td>
<asp:Button ID= "UpdateButton" runat= "server" CommandName= "Update" Text= "Update" />
<asp:Button ID= "CancelButton" runat= "server" CommandName= "Cancel" Text= "Cancel" />
</td>
<td>
</td>
<td>
</td>
<td>
<asp:TextBox ID= "NameTextBox" runat= "server" Text= '<%# Bind("Name") %>' />
</td>
<td>
</td>
<td>
</td>
</tr>
</EditItemTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID= "InsertButton" runat= "server" CommandName= "Insert" Text= "Insert" />
<asp:Button ID= "CancelButton" runat= "server" CommandName= "Cancel" Text= "Clear" />
</td>
<td>
</td>
<td>
</td>
<td>
<asp:TextBox ID= "NameTextBox" runat= "server" Text= '<%# Bind("Name") %>' />
</td>
<td>
</td>
<td>
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr style="">
<td>
<asp:Button ID= "DeleteButton" runat= "server" CommandName= "Delete" Text= "Delete" />
<asp:Button ID= "EditButton" runat= "server" CommandName= "Edit" Text= "Edit" />
</td>
<td>
<asp:Label ID= "ProductCategoryIDLabel" runat= "server" Text= '<%# Eval("ProductCategoryID") %>' />
</td>
<td>
<asp:Label ID= "ParentProductCategoryIDLabel" runat= "server" Text= '<%# Eval("ParentProductCategoryID") %>' />
</td>
<td>
<asp:Label ID= "NameLabel" runat= "server" Text= '<%# Eval("Name") %>' />
</td>
<td>
<asp:Label ID= "rowguidLabel" runat= "server" Text= '<%# Eval("rowguid") %>' />
</td>
<td>
<asp:Label ID= "ModifiedDateLabel" runat= "server" Text= '<%# Eval("ModifiedDate") %>' />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table id= "itemPlaceholderContainer" runat= "server" border= "0" style="">
<tr runat= "server" style="">
<th runat= "server">
</th>
<th runat= "server">
ProductCategoryID
</th>
<th runat= "server">
ParentProductCategoryID
</th>
<th runat= "server">
Name
</th>
<th runat= "server">
rowguid
</th>
<th runat= "server">
ModifiedDate
</th>
</tr>
<tr id= "itemPlaceholder" runat= "server">
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
<asp:ObjectDataSource ID= "ObjectDataSource1" runat= "server" DataObjectTypeName= "SelfTrackingDemo.ProductCategory"
DeleteMethod= "DeleteCategory" InsertMethod= "AddCategory" SelectMethod= "GetCategories"
TypeName= "SelfTrackingDemo.BLL" OnInserting= "ObjectDataSource1_Inserting" OnDeleting= "ObjectDataSource1_Deleting">
</asp:ObjectDataSource>
</div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns= "http://www.w3.org/1999/xhtml">
<head runat= "server">
<title></title>
</head>
<body>
<form id= "form1" runat= "server">
<div>
<asp:ListView ID= "ListView1" runat= "server" DataSourceID= "ObjectDataSource1" DataKeyNames= "ProductCategoryID"
InsertItemPosition= "LastItem" OnItemUpdating= "ListView1_ItemUpdating">
<EditItemTemplate>
<tr style="">
<td>
<asp:Button ID= "UpdateButton" runat= "server" CommandName= "Update" Text= "Update" />
<asp:Button ID= "CancelButton" runat= "server" CommandName= "Cancel" Text= "Cancel" />
</td>
<td>
</td>
<td>
</td>
<td>
<asp:TextBox ID= "NameTextBox" runat= "server" Text= '<%# Bind("Name") %>' />
</td>
<td>
</td>
<td>
</td>
</tr>
</EditItemTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID= "InsertButton" runat= "server" CommandName= "Insert" Text= "Insert" />
<asp:Button ID= "CancelButton" runat= "server" CommandName= "Cancel" Text= "Clear" />
</td>
<td>
</td>
<td>
</td>
<td>
<asp:TextBox ID= "NameTextBox" runat= "server" Text= '<%# Bind("Name") %>' />
</td>
<td>
</td>
<td>
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr style="">
<td>
<asp:Button ID= "DeleteButton" runat= "server" CommandName= "Delete" Text= "Delete" />
<asp:Button ID= "EditButton" runat= "server" CommandName= "Edit" Text= "Edit" />
</td>
<td>
<asp:Label ID= "ProductCategoryIDLabel" runat= "server" Text= '<%# Eval("ProductCategoryID") %>' />
</td>
<td>
<asp:Label ID= "ParentProductCategoryIDLabel" runat= "server" Text= '<%# Eval("ParentProductCategoryID") %>' />
</td>
<td>
<asp:Label ID= "NameLabel" runat= "server" Text= '<%# Eval("Name") %>' />
</td>
<td>
<asp:Label ID= "rowguidLabel" runat= "server" Text= '<%# Eval("rowguid") %>' />
</td>
<td>
<asp:Label ID= "ModifiedDateLabel" runat= "server" Text= '<%# Eval("ModifiedDate") %>' />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table id= "itemPlaceholderContainer" runat= "server" border= "0" style="">
<tr runat= "server" style="">
<th runat= "server">
</th>
<th runat= "server">
ProductCategoryID
</th>
<th runat= "server">
ParentProductCategoryID
</th>
<th runat= "server">
Name
</th>
<th runat= "server">
rowguid
</th>
<th runat= "server">
ModifiedDate
</th>
</tr>
<tr id= "itemPlaceholder" runat= "server">
</tr>
</table>
</LayoutTemplate>
</asp:ListView>
<asp:ObjectDataSource ID= "ObjectDataSource1" runat= "server" DataObjectTypeName= "SelfTrackingDemo.ProductCategory"
DeleteMethod= "DeleteCategory" InsertMethod= "AddCategory" SelectMethod= "GetCategories"
TypeName= "SelfTrackingDemo.BLL" OnInserting= "ObjectDataSource1_Inserting" OnDeleting= "ObjectDataSource1_Deleting">
</asp:ObjectDataSource>
</div>
</form>
</body>
</html>
SelfTrackingDemo/Demo.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace SelfTrackingDemo
{
public partial class Demo : System.Web.UI.Page
{
void Page_Load() void Page_Load(object sender, EventArgs e)
{
}
void ObjectDataSource1_Inserting() void ObjectDataSource1_Inserting(object sender, ObjectDataSourceMethodEventArgs e)
{
var category = e.InputParameters[0] as ProductCategory;
category.rowguid = Guid.NewGuid();
category.ModifiedDate = DateTime.Now;
}
void ObjectDataSource1_Deleting() void ObjectDataSource1_Deleting(object sender, ObjectDataSourceMethodEventArgs e)
{
}
void ListView1_ItemUpdating() void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)
{
BLL bll = new BLL();
var category = bll.GetCategory((int)ListView1.DataKeys[e.ItemIndex].Value);
// 注意：這裏必定要手動調用 StartTracking() 方法，用於跟蹤實體狀態的改變
category.StartTracking();
category.Name = e.NewValues[ "Name"].ToString();
bll.UpdateCategory(category);
ListView1.EditIndex = -1;
e.Cancel = true;
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace SelfTrackingDemo
{
public partial class Demo : System.Web.UI.Page
{
void Page_Load() void Page_Load(object sender, EventArgs e)
{
}
void ObjectDataSource1_Inserting() void ObjectDataSource1_Inserting(object sender, ObjectDataSourceMethodEventArgs e)
{
var category = e.InputParameters[0] as ProductCategory;
category.rowguid = Guid.NewGuid();
category.ModifiedDate = DateTime.Now;
}
void ObjectDataSource1_Deleting() void ObjectDataSource1_Deleting(object sender, ObjectDataSourceMethodEventArgs e)
{
}
void ListView1_ItemUpdating() void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)
{
BLL bll = new BLL();
var category = bll.GetCategory((int)ListView1.DataKeys[e.ItemIndex].Value);
// 注意：這裏必定要手動調用 StartTracking() 方法，用於跟蹤實體狀態的改變
category.StartTracking();
category.Name = e.NewValues[ "Name"].ToString();
bll.UpdateCategory(category);
ListView1.EditIndex = -1;
e.Cancel = true;
}
}
}
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相關文章
- 1. 上接精進不休 .NET 4.0 (8) - ADO.NET Entity Framework 4.0 Self Tracking Entity
- 2. 精進不休 .NET 4.0 (7) - ADO.NET Entity Framework 4.0 新特性
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