稳扎稳打Silverlight(28) - 2.0通信之调用ADO.NET Data Services(数据服务)

概述  [索引页] [源码下载] 稳扎稳打Silverlight(28) - 2.0通信之调用ADO.NET Data Services(数据服务) 作者： webabcd 介绍 Silverlight 2.0 调用 ADO.NET Data Services (数据服务)。本文以 Northwind 数据库为示例数据库，做一个添加、查询、更新和删除的Demo      在 Silverlight 2   [索引页]
[源码下载]

稳扎稳打Silverlight(28) - 2.0通信之调用ADO.NET Data Services(数据服务)
作者： webabcd
介绍
Silverlight 2.0 调用 ADO.NET Data Services (数据服务)。本文以 northwind 数据库为示例数据库，做一个添加、查询、更新和删除的Demo 
    在 Silverlight 2.0 中调用数据服务只能使用异步方式调用。另外，数据服务要与 Silverlight 宿主放在相同的域上
    System.Data.Services.ClIEnt.DataServiceContext - 数据服务上下文
    System.Data.Services.ClIEnt.DataServicequery - 以指定的 URI 语法查询数据服务
    Addobject(),UpdateObject(),DeleteObject() - 本别用于添加,更新,删除实体
    BeginExecute()/EndExecute(),BeginExecuteBatch()/EndExecuteBatch - 用于执行某一个 DataServicequery 查询或批量执行（将一组查询一次性地提交到数据服务）
    BeginSaveChanges()/EndSaveChanges() - 用于提交对实体的修改（增,删,改）
    BeginLoadproperty()/EndLoadproperty() - 用于加载指定的属性的值，加载导航属性的时候需要用到它
    Addlink(),Setlink(),Deletelink() - 分别为创建连接，Added状态（一对多）；创建连接，Added状态（多对一）；删除连接，Deleted状态
在线DEMO
http://www.cnblogs.com/webabcd/archive/2008/10/09/1307486.html  
示例
1、数据服务
northwindDataService.svc

<% @ ServiceHost Language="C#" FactorySystem.Data.Services.DataServiceHostFactory, System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 ServiceSilverlight20.Web.DataService.northwindDataService  %>
northwindDataService.svc.cs

using  System;

using  System.Collections.Generic;

using  System.Data.Services;

using  System.linq;

using  System.ServiceModel.Web;

using  System.Web;

namespace  Silverlight20.Web.DataService

{

    public class northwindDataService : DataService<northwindEntitIEs>

    {

        public static voID InitializeService(IDataServiceConfiguration config)

        {

            config.SetEntitySetAccessRule("*", EntitySetRights.All);

        }

    }

}
2、Silverlight 调用数据服务
DataService.xaml

< UserControl  x:Class ="Silverlight20.Communication.DataService"

    xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  

    xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:data ="clr-namespace:System.windows.Controls;assembly=System.windows.Controls.Data" >

     < StackPanel  HorizontalAlignment ="left"  margin ="5" >

         < TextBlock  x:name ="lblMsg"  margin ="10"  Foreground ="Red"   />

         < StackPanel  OrIEntation ="Horizontal" >

             < TextBlock  x:name ="lblcategoryname"  Text ="类别名称"  margin ="10"   />

             < TextBox  x:name ="txtcategoryname"  WIDth ="100"  margin ="10"   />

             < TextBlock  x:name ="lblDescription"  Text ="类别备注"  margin ="10"   />

             < TextBox  x:name ="txtDescription"  WIDth ="100"  margin ="10"   />

             < button  x:name ="btnAdd"  Content ="添加"  margin ="10"  Click ="btnAdd_Click"   />

         </ StackPanel >

         < StackPanel  OrIEntation ="Horizontal" >

             < button  x:name ="btnUpdate"  Content ="更新选中"  margin ="10"  Click ="btnUpdate_Click"   />

             < button  x:name ="btnDelete"  Content ="删除选中"  margin ="10"  Click ="btnDelete_Click"    />

         </ StackPanel >

         < data:DataGrID  name ="dataGrID1"  margin ="10"  autoGenerateColumns ="False"  ItemsSource =" {Binding} "

            SelectionChanged ="DataGrID_SelectionChanged" >

             < data:DataGrID.Columns >

                 < data:DataGrIDTextColumn  header ="类别ID"  Binding =" {Binding categoryID} "   />

                 < data:DataGrIDTextColumn  header ="类别名称"  Binding =" {Binding categoryname} "   />

                 < data:DataGrIDTextColumn  header ="类别备注"  Binding =" {Binding Description} "   />

             </ data:DataGrID.Columns >

         </ data:DataGrID >

         < data:DataGrID  name ="dataGrID2"  margin ="10"  autoGenerateColumns ="False"  ItemsSource =" {Binding} " >

             < data:DataGrID.Columns >

                 < data:DataGrIDTextColumn  header ="产品ID"  Binding =" {Binding ProductID} "   />

                 < data:DataGrIDTextColumn  header ="产品名称"  Binding =" {Binding Productname} "   />

             </ data:DataGrID.Columns >

         </ data:DataGrID >

     </ StackPanel >

</ UserControl >

DataService.xaml.cs

using  System;

using  System.Collections.Generic;

using  System.linq;

using  System.Net;

using  System.windows;

using  System.windows.Controls;

using  System.windows.documents;

using  System.windows.input;

using  System.windows.Media;

using  System.windows.Media.Animation;

using  System.windows.Shapes;

using  System.Data.Services.ClIEnt;

using  System.Collections.ObjectModel;

using  Silverlight20.northwindDataService;

namespace  Silverlight20.Communication

{

    public partial class DataService : UserControl

    {

        // 配置服务地址，数据服务要与 Silverlight 宿主放在相同的域上

        Uri uri = new Uri("DataService/northwindDataService.svc", UriKind.relative);

        northwindEntitIEs ctx;

        ObservableCollection<CategorIEs> categorIEs;

        ObservableCollection<Products> products;

        public DataService()

        {

            InitializeComponent();

            this.Loaded += new RoutedEventHandler(DataService_Loaded);

        }

        voID DataService_Loaded(object sender, RoutedEventArgs e)

        {

            // 实例化 DataServiceContext

            ctx = new northwindEntitIEs(uri);

            // 初始化 CategorIEs 集合，为了做 OneWay ，所以是 ObservableCollection<CategorIEs> 类型

            categorIEs = new ObservableCollection<CategorIEs>();

            // 初始化 Products 集合，为了做 OneWay ，所以是 ObservableCollection<Products> 类型

            products = new ObservableCollection<Products>();

            Bindcategory();

        }

        private voID Bindcategory()

        {

            DataServicequery<CategorIEs> query = ctx.CategorIEs;

            // IAsyncResult BeginExecute(AsyncCallback callback, object state) - 以异步方式发出请求

            //     AsyncCallback callback - 经典的 AsyncCallback 委托，指定回调方法

            //     object state - 传递给回调方法的自定义对象，此处必须是 DataServicequery<T> 类型

            query.BeginExecute(OnBindcategoryCompleted, query);

            // RequestUri - 请求服务的地址，因为数据服务发布的是REST，所以也可以用自己构造 URI 的方式去调用数据服务，详细的 URI 语法请参看 MSDN

            lblMsg.Text = "读取类别数据中。。。" + query.RequestUri.ToString();

        }

        voID OnBindcategoryCompleted(IAsyncResult ar)

        {

            try

            {

                var query = ar.AsyncState as DataServicequery<CategorIEs>;

                // EndExecute(IAsyncResult ar) - 获取异步查询的结果

                var result = query.EndExecute(ar);

                foreach (var item in result)

                {

                    categorIEs.Add(item);

                }

                this.dispatcher.BeginInvoke(() =>

                {

                    dataGrID1.DataContext = categorIEs;

                    lblMsg.Text = "";

                });

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        private voID btnAdd_Click(object sender, RoutedEventArgs e)

        {

            CategorIEs category = new CategorIEs();

            category.categoryname = txtcategoryname.Text;

            category.Description = txtDescription.Text;

            ctx.AddToCategorIEs(category);

            for (int i = 0; i < 10; i++)

            {

                var product = new Products() { Productname = "测试用" + i.ToString() };

                product.CategorIEs = category;

                ctx.Addtoproducts(product);

                // 多对一关系，使用 Setlink 建立连接，BeginSaveChanges() 的时候会一起发送到数据服务

                ctx.Setlink(product, "CategorIEs", category);

            }

            ctx.BeginSaveChanges(OnAddCompleted, category);

            lblMsg.Text = "新增数据中。。。";

        }

        voID OnAddCompleted(IAsyncResult ar)

        {

            try

            {

                var x = ctx.EndSaveChanges(ar);

                categorIEs.Add(ar.AsyncState as CategorIEs);

                this.dispatcher.BeginInvoke(() =>

                {

                    lblMsg.Text = "";

                });

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        private voID DataGrID_SelectionChanged(object sender, SelectionChangedEventArgs e)

        {

            var category = e.AddedItems[0] as CategorIEs;

            BindProduct(category.categoryID);

        }

        private voID BindProduct(int categoryID)

        {

            // 可以使用 Lambda 表达式或查询语法，然后将其转换为 DataServicequery<T> 再使用

            DataServicequery<Products> query =

                (from p in ctx.Products where p.CategorIEs.categoryID == categoryID select p) as DataServicequery<Products>;

            lblMsg.Text = "读取产品数据中。。。";

            query.BeginExecute(OnBindProductCompleted, query);

        }

        voID OnBindProductCompleted(IAsyncResult ar)

        {

            try

            {

                var query = ar.AsyncState as DataServicequery<Products>;

                var result = query.EndExecute(ar);

                products.Clear();

                foreach (var item in result)

                {

                    products.Add(item);

                }

                this.dispatcher.BeginInvoke(() =>

                {

                    dataGrID2.DataContext = products;

                    lblMsg.Text = "";

                });

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        private voID btnDelete_Click(object sender, RoutedEventArgs e)

        {

            if (dataGrID1.SelectedItem != null)

            {

                try

                {

                    CategorIEs category = dataGrID1.SelectedItem as CategorIEs;

                    Deletecategory(category);

                    lblMsg.Text = "删除中。。。";

                }

                catch (DataServiceRequestException ex)

                {

                    lblMsg.Text = ex.ToString();

                }

            }

        }

        private voID Deletecategory(CategorIEs category)

        {

            try

            {

                // BeginLoadProperty(object entity, string propertyname, AsyncCallback callback, object state) - 开始加载指定属性的值的异步 *** 作

                //     object entity - 需要加载属性的所属实体 

                //     string propertyname - 需要加载属性的名称

                //     AsyncCallback callback - 经典的 AsyncCallback 委托，指定回调方法

                //     object state - 传递给回调方法的自定义对象

                ctx.BeginLoadProperty(category, "Products", OnLoadPropertyCompleted, category);

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        voID OnLoadPropertyCompleted(IAsyncResult ar)

        {

            CategorIEs category = ar.AsyncState as CategorIEs;

            try

            {

                // EndLoadProperty(IAsyncResult ar) - 完成加载指定属性的值的这个异步 *** 作

                ctx.EndLoadProperty(ar);

                foreach (Products product in category.Products)

                {

                    // 在指定的对象上删除指定的连接，BeginSaveChanges() 的时候会一起发送到数据服务

                    ctx.Deletelink(category, product);

                }

                ctx.DeleteObject(category);

                ctx.BeginSaveChanges(OnDeletecategoryCompleted, null);

                categorIEs.Remove(category);

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        voID OnDeletecategoryCompleted(IAsyncResult ar)

        {

            try

            {

                ctx.EndSaveChanges(ar);

                lblMsg.Text = "";

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

        private voID btnUpdate_Click(object sender, RoutedEventArgs e)

        {

            if (dataGrID1.SelectedItem != null)

            {

                try

                {

                    CategorIEs category = dataGrID1.SelectedItem as CategorIEs;

                    ctx.UpdateObject(category);

                    ctx.BeginSaveChanges(OnUpdatecategoryCompleted, category);

                    lblMsg.Text = "更新中。。。";

                }

                catch (DataServiceRequestException ex)

                {

                    lblMsg.Text = ex.ToString();

                }

            }

        }

        voID OnUpdatecategoryCompleted(IAsyncResult ar)

        {

            try

            {

                ctx.EndSaveChanges(ar);

                lblMsg.Text = "";

            }

            catch (DataServiceRequestException ex)

            {

                lblMsg.Text = ex.ToString();

            }

        }

    }

}
OK
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