Silverlight 使用WCF RIA 方式对数据库进行增删改查

　　使用的是Northwind数据库

　　DomainService1.cs中的文件内容：

namespace SlWCfRiaDemo.Web
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.ComponentModel.DataAnnotations;
    using System.Data;
    using System.Linq;
    using System.ServiceModel.DomainServices.EntityFramework;
    using System.ServiceModel.DomainServices.Hosting;
    using System.ServiceModel.DomainServices.Server;


    // Implements application logic using the NorthwindEntities context.
    // TODO: Add your application logic to these methods or in additional methods.
    // TODO: Wire up authentication (Windows/ASP.NET Forms) and uncomment the following to disable anonymous access
    // Also consider adding roles to restrict access as appropriate.
    // [RequiresAuthentication]
    [EnableClientAccess()]
    public class DomainService1 : LinqToEntitiesDomainService<NorthwindEntities>
    {

        // TODO:
        // Consider constraining the results of your query method.  If you need additional input you can
        // add parameters to this method or create additional query methods with different names.
        // To support paging you will need to add ordering to the 'Categories' query.
        public IQueryable<Categories> GetCategories()
        {
            return this.ObjectContext.Categories;
        }

        public void InsertCategory(Categories category)
        {
            if ((category.EntityState != EntityState.Detached))
            {
                this.ObjectContext.ObjectStateManager.ChangeObjectState(category, EntityState.Added);
            }
            else
            {
                this.ObjectContext.Categories.AddObject(category);
            }
        }

        public void UpdateCategory(Categories currentCategory)
        {
            this.ObjectContext.Categories.AttachAsModified(currentCategory, this.ChangeSet.GetOriginal(currentCategory));
        }

        public void DeleteCategory(Categories category)
        {
            if ((category.EntityState == EntityState.Detached))
            {
                this.ObjectContext.Categories.Attach(category);
            }
            this.ObjectContext.Categories.DeleteObject(category);
        }
    }
}

　　MainPage.xaml.cs:

using SlWCfRiaDemo.Web;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Net;
using System.ServiceModel.DomainServices.Client;
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;

namespace SlWCfRiaDemo
{
    public partial class MainPage : UserControl
    {
        DomainService1 ds = new DomainService1();

        public ObservableCollection<Categories> Data { get; set; }

        public MainPage()
        {
            InitializeComponent();
            Data = new ObservableCollection<Categories>();

            LoadData();
        }

        /// <summary>
        /// 加载数据
        /// </summary>
        private void LoadData()
        {
            ds.Load(ds.GetCategoriesQuery(), o => 
            {
                Data.Clear();
                foreach (Categories c in o.Entities)
                {
                    Data.Add(c);
                }
                this.datalist.ItemsSource = Data;
            }, null);
        }

        /// <summary>
        /// 增加数据
        /// </summary>
        /// <param name="categoryName"></param>
        public void Insert(string categoryName)
        {
            EntitySet<Categories> categories = ds.EntityContainer.GetEntitySet<Categories>();
            Categories cate = new Categories();
            cate.CategoryName = categoryName;
            cate.CategoryID = 12;
            categories.Add(cate);

            ds.SubmitChanges(OnInsertCompleted, cate);
        }
        private void OnInsertCompleted(SubmitOperation so)
        {
            if (!so.HasError)
            {
                Data.Insert(0, so.UserState as Categories);
            }
        }

        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="categories"></param>
        public void Delete(List<Categories> categories)
        {
            EntitySet<Categories> categoriesOriginal = ds.EntityContainer.GetEntitySet<Categories>();
            foreach (Categories c in categories)
            {
                categoriesOriginal.Remove(c);
            }
            ds.SubmitChanges(OnDeleteCompleted, categories);
        }
        private void OnDeleteCompleted(SubmitOperation so)
        {
            if (!so.HasError)
            {
                List<Categories> categories = so.UserState as List<Categories>;
                foreach (Categories cc in categories)
                {
                    Data.Remove(cc);
                }
            }
        }

        /// <summary>
        /// 更新数据
        /// </summary>
        public void Update()
        {
            ds.SubmitChanges(OnUpdateCompleted, null);
        }
        private void OnUpdateCompleted(SubmitOperation so)
        {
            if (!so.HasError)
            {
                MessageBox.Show("更新成功");
            }
        }

        /// <summary>
        /// 增加按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            Insert(this.txtCate.Text.Trim().ToString());
        }

        /// <summary>
        /// 删除按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDele_Click_1(object sender, RoutedEventArgs e)
        {
            var collection = this.datalist.SelectedItems as System.Collections.IList;
            var categories = new List<Categories>();
            foreach (Categories cate in collection)
            {
                categories.Add(cate);
            }

            Delete(categories);
        }

        /// <summary>
        /// 更新按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnUpdate_Click_1(object sender, RoutedEventArgs e)
        {
            Update();
        }

    }
}

　　MainPage.xaml:

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="SlWCfRiaDemo.MainPage"
    mc:Ignorable="d"
    d:DesignHeight="600" d:DesignWidth="800">

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBox x:Name="txtCate" HorizontalAlignment="Left" Height="31" Margin="138,63,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="151"/>
        <Button x:Name="btnAdd" Content="增 加" HorizontalAlignment="Left" Height="31" Margin="309,63,0,0" VerticalAlignment="Top" Width="82" Click="btnAdd_Click"/>

        <sdk:DataGrid x:Name="datalist" AutoGenerateColumns="False" HorizontalAlignment="Left" Height="276" Margin="138,133,0,0" VerticalAlignment="Top" Width="446">
            <sdk:DataGrid.Columns>
                <sdk:DataGridTextColumn Header="类别ID" Binding="{Binding CategoryID}" IsReadOnly="True" />
                <sdk:DataGridTextColumn Header="类别名称" Binding="{Binding CategoryName}" IsReadOnly="True" />
                <sdk:DataGridTextColumn Header="详细描述" Binding="{Binding Description}" IsReadOnly="True" />
                <sdk:DataGridTextColumn Header="图片" Binding="{Binding Picture}" />
            </sdk:DataGrid.Columns>
        </sdk:DataGrid>
        <Button x:Name="btnDele" Content="删  除" HorizontalAlignment="Left" Height="31" Margin="410,63,0,0" VerticalAlignment="Top" Width="82" Click="btnDele_Click_1"/>
        <Button x:Name="btnUpdate" Content="更  新" HorizontalAlignment="Left" Height="31" Margin="514,63,0,0" VerticalAlignment="Top" Width="82" Click="btnUpdate_Click_1"/>

    </Grid>
</UserControl>

　　更新功能没实现

　　本文来自朋朋朋的博客，原文地址：http://www.cnblogs.com/caok168/archive/2012/11/14/2770091.html

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