DDD领域模型企业级系统Linq的CRUD（四）
建造一个Product Module类：
ProductDBContextDataContext dbcontext = new
ProductDBContextDataContext();
public List<Product> GetProducts()
{
var query = dbcontext.Product.Where(p => p.cid == 1).ToList();
return query;
}
public object GetProductCS()
{
var query = from c in dbcontext.ProductCategory
join p in dbcontext.Product on c.cid equals p.cid
where p.cid == 1
select new { CName = c.cname, PName = p.pname, UnitPrice = p.unitprice };
return query.ToList();
}
public List<Product> GetAllProducts(int skipcount, int currentpagecount)
{
var query = dbcontext.Product.Skip(skipcount).Take(currentpagecount).ToList();
return query;
}
public void AddCP()
{
ProductCategory pc = new ProductCategory();
pc.cid = 3;
pc.cname = "c3";
Product p1 = new Product();
p1.pid = 5;
p1.pname = "p5";
Product p2 = new Product();
p2.pid = 6;
p2.pname = "p6";
pc.Product.Add(p1);
pc.Product.Add(p2);
dbcontext.ProductCategory.InsertOnSubmit(pc);
dbcontext.SubmitChanges();
}
public void Modifyp()
{
var product = dbcontext.Product.Where(p => p.pid == 5).SingleOrDefault();
product.unitprice = 200;
dbcontext.SubmitChanges();
}
public void DeleteP()
{
var product = dbcontext.Product.Where(p => p.pid == 5).SingleOrDefault();
dbcontext.Product.DeleteOnSubmit(product);
dbcontext.SubmitChanges();
}
public void DeletePS()
{
var product = dbcontext.Product.Where(p => p.pid == 5).ToList();
dbcontext.Product.DeleteAllOnSubmit(product);
dbcontext.SubmitChanges();
}
静态页面：
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="LinqToSQLWeb._Default" %>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="显示产品" />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="连接显示产品" />
<br />
<asp:TextBox ID="TextBox1" runat="server">1</asp:TextBox>
<br />
<asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="显示所有产品" />
<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="上一页" />
<asp:Button ID="Button5" runat="server" OnClick="Button5_Click" Text="下一页" />
<br />
<asp:Button ID="Button6" runat="server" OnClick="Button6_Click" Text="添加" />
<asp:Button ID="Button7" runat="server" OnClick="Button7_Click" Text="修改" />
<asp:Button ID="Button8" runat="server" OnClick="Button8_Click" Text="删除" />
</asp:Content>
后台类：
Product.Domain.Products products =
new Product.Domain.Products();
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button3_Click(object sender, EventArgs e)
{
TextBox1.Text = "1";
GetProductsBinding(2);
}
protected void Button4_Click(object sender, EventArgs e)
{
if (int.Parse(TextBox1.Text) > 0)
{
TextBox1.Text = (int.Parse(TextBox1.Text) - 1).ToString();
}
GetProductsBinding(2);
}
protected void Button5_Click(object sender, EventArgs e)
{
TextBox1.Text = (int.Parse(TextBox1.Text) + 1).ToString();
GetProductsBinding(2);
}
private void GetProductsBinding(int count)
{
List<Product.Domain.Product> allproducts;
if (int.Parse(TextBox1.Text) == 0)
{
allproducts = products.GetAllProducts(0, count).ToList();
}
allproducts = products.GetAllProducts((int.Parse(TextBox1.Text) - 1) * 2, count);
GridView1.DataSource = allproducts;
GridView1.DataBind();
}
protected void Button6_Click(object sender, EventArgs e)
{
products.AddCP();
}
protected void Button7_Click(object sender, EventArgs e)
{
products.Modifyp();
}
protected void Button8_Click(object sender, EventArgs e)
{
products.DeleteP();
}
EF的实例：
ProductSystemModelContainer productdbcontext = new ProductSystemModelContainer();
public List<Product> GetAllProduct(int page,int count)
{
var query = productdbcontext.Product.Skip(page * count).Take(count).ToList();
return query;
}
public object GetAllPC(int page, int count)
{
var query = productdbcontext.ProductCategory.Join(productdbcontext.Product, c => c.Id, p => p.ProductCategory.Id,
(c, p) => new { CName = c.CategoryName, PName = p.ProductName, UnitPrice = p.UnitPrice }).OrderBy(p=>p.UnitPrice).Skip(page * count).Take(count).ToList();
return query;
}
public void AddProduct()
{
ProductCategory c = new ProductCategory();
c.Id = Guid.NewGuid();
c.CategoryName = "c1";
Product p = new Product();
p.Id = Guid.NewGuid();
p.ProductName = "p1";
p.UnitPrice = 80;
p.ProductCategory = c;
productdbcontext.Set<ProductCategory>().Add(c);
productdbcontext.Set<Product>().Add(p);
productdbcontext.SaveChanges();
}
public void ModifyProduct()
{
var product = productdbcontext.Product.Where(p => p.ProductName == "p1").FirstOrDefault();
product.UnitPrice = 55;
productdbcontext.Entry(product).State =
System.Data.Entity.EntityState.Modified;
productdbcontext.SaveChanges();
}
public void RemoveProduct()
{
var product = productdbcontext.Product.Where(p => p.ProductName == "p1").FirstOrDefault();
productdbcontext.Set<Product>().Remove(product);
productdbcontext.SaveChanges();
}
前端代码：
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<br />
<asp:TextBox ID="TextBox1" runat="server">0</asp:TextBox>
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="创建" />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="上一页" />
<asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="下一页" />
<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="修改" />
<asp:Button ID="Button5" runat="server" OnClick="Button5_Click" Text="销毁" />
</asp:Content>
后台代码：
LINQEFService efservice = new LINQEFService();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
private void Bind()
{
var result = efservice.GetAllPC(int.Parse(TextBox1.Text), 2);
GridView1.DataSource = result;
GridView1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
efservice.AddProduct();
Bind();
}
protected void Button2_Click(object sender, EventArgs e)
{
if (int.Parse(TextBox1.Text) > 0)
{
TextBox1.Text = (int.Parse(TextBox1.Text) - 1).ToString();
Bind();
}
}
protected void Button3_Click(object sender, EventArgs e)
{
TextBox1.Text = (int.Parse(TextBox1.Text) + 1).ToString();
Bind();
}
protected void Button4_Click(object sender, EventArgs e)
{
efservice.ModifyProduct();
Bind();
}
protected void Button5_Click(object sender, EventArgs e)
{
efservice.RemoveProduct();
Bind();
}
直接实例化服务端的弊端：
Service Locator体系架构模式：
实例：
定义接口：IPrintService
public interface IPrintService
{
string Print(string msg);
}
子类PrintSerivceNew：
public class PrintSerivceNew:IPrintService
{
public string Print(string msg)
{
return "SerivceNew:" + msg;
}
}
子类：PrintService
public class PrintService : IPrintService
{
public string Print(string msg)
{
return "Serivce1:" + msg;
}
}
服务工厂ServiceFactory
public abstract class ServiceFactory
{
public object GetService()
{
return this.DoGetService();
}
public abstract object DoGetService();
public abstract Type SerivceType { get; }
}
具体实现工厂：PrintServiceFactory
public class PrintServiceFactory:ServiceFactory
{
public override object DoGetService()
{
return new PrintSerivceNew();
}
public override Type SerivceType
{
get
{
return typeof(IPrintService);
}
}
}
具体的业务：
public class ServiceLocator
{
private Dictionary<Type, ServiceFactory> servicedics =
new Dictionary<Type, ServiceFactory>();
public ServiceLocator()
{
foreach(var type in this.GetType().Assembly.GetExportedTypes())
{
if(type.IsSubclassOf(typeof(ServiceFactory)))
{
var factory = (ServiceFactory)Activator.CreateInstance(type);
servicedics.Add(factory.SerivceType, factory);
}
}
}
public object GetServiceByType(Type type)
{
var factory = servicedics[type];
return factory.GetService();
}
}
调用：
static void Main(string[] args)
{
ServiceLocator servicelocator =
new ServiceLocator();
var objectservice=servicelocator.GetServiceByType(typeof(IPrintService));
Console.WriteLine((objectservice as IPrintService).Print("hello"));
Console.ReadLine();
}
