基于Silverlight的快速开发框架RapidSL新特性解析

对sl传统的开发方式进行了集成和封装，核心模块基于MVVM，通用的CRUD ViewModel，只需要定制自己的Xaml View，提供了非常便捷的快速开发方式; 采用了Silverlight 5.0 + EF4.1 Code First + Ria Service SP2 + Ria Service Toolkit + Silverlight Control Toolkit + Light MVVM；已经实现了轻量级的权限管理，上传模块，内容管理，作为实例，涉及到了sl开发的各种技术难点和技巧，既可以作为学习，也可以作为项目开发的原型

点击预览 | 源代码

支持动态加载.xap，面向插件开发

• RapidSL.SL.App.Portal提供主框架的UI逻辑，只需要开发自己的App，如RapidSL.SL.App.Main

   

• 然后配置菜单：

   <sdk:TreeViewItem Header="产品管理" IsExpanded="True">
  
       2                                 <controls:AdminMenuItem Id="1" Margin="2" Content="ProductEdit" NavigateView="RapidSL.SL.App.Main.xap/Product.Index" ViewPermission="ProductView"/>
  
       3                                 <controls:AdminMenuItem Id="2" Margin="2" Content="CategoryEdit" NavigateView="RapidSL.SL.App.Main.xap/Category.Index" ViewPermission="CategoryView"/>
  
       4                             </sdk:TreeViewItem>

  NavigateView="RapidSL.SL.App.Main.xap/Product.Index"将调用XapHost控件从服务端下载动态加载
  NavigateView="RapidSL.SL.App.Portal.Admin"将调用当前程序集的控件

•  XapHost控件提供动态下载.xap及加载

   1 public XapHost(string xapUri, string viewName = null)
  
        2         {
  
        3             InitializeComponent();
  
        4 
  
        5             this.FileName = xapUri;
  
        6 
  
        7             var xapLoad = new XapLoader(xapUri);
  
        8             xapLoad.DownloadProgressChanged += (s, e) =>
  
        9             {
  
       10                 this.TotalSize = (e.TotalBytesToReceive * 1d / 1024 / 1024).ToString("0.00");
  
       11                 this.Percentage = e.ProgressPercentage;
  
       12             };
  
       13 
  
       14             xapLoad.LoadCompleted += (s, e) =>
  
       15             {
  
       16                 this.Content = e.Element;
  
       17             };
  
       18 
  
       19             xapLoad.LoadControl(null, viewName);
  
       20         }

对Resource的支持

• 找到所有标识有 StaticResourceAttribute的类，然后创建相关实例，并注入到Application.Resources，相当于在 App.xaml里手写资源
• 实现了资源管理器对资源进行注入管理

 1 public class ViewModelManager
 2     {
 3         private static Application app = Application.Current;
 4 
 5         public static void InjectViewModelsToResources()
 6         {
 7             foreach (AssemblyPart ap in Deployment.Current.Parts)
 8             {
 9                 var sri = Application.GetResourceStream(new Uri(ap.Source, UriKind.Relative));
10                 var assembly = new AssemblyPart().Load(sri.Stream);
11 
12                 InjectViewModelsToResources(assembly);
13             
14             } 
15         }
16 
17         public static void InjectViewModelsToResources(Assembly assembly)
18         {
19             foreach (Type type in assembly.GetTypes())
20             {
21                 var attributes = type.GetCustomAttributes(false);
22 
23                 foreach (var attribute in attributes)
24                 {
25                     if (attribute is StaticResourceAttribute)
26                     {
27                         var resourceKey = ((StaticResourceAttribute)attribute).Key;
28                         if (string.IsNullOrEmpty(resourceKey))
29                             resourceKey = type.Name;
30 
31                         var obj = Activator.CreateInstance(type);
32                         if (!app.Resources.Contains(resourceKey))
33                             app.Resources.Add(resourceKey, obj);
34                     }
35                 }
36             }
37         }
38 
39         public static T GetViewModelFromResources<T>()
40         {
41             var key = typeof(T).Name;
42             if (app.Resources.Contains(key))
43                 return (T)app.Resources[key];
44             else
45                 return default(T);
46         }
47     }

键盘Enter键提交表单

• 使用AttatchProperty实现传统Html表单的键盘Enter提交

   <Grid x:Name="LayoutRoot" core:AttachProperties.SubmitButton="{Binding ElementName=submit}">
  
       2 <Button x:Name="submit" Content="登录" Margin="20,0,20,0" Padding="20,0,20,0" Command="{Binding UserLogin}"/>
  
       3 </Grid>

• 具体绑定按钮和键盘事件
  

   1 #region SubmitButton AttachProperty
  
        2         public static object GetSubmitButton(DependencyObject obj)
  
        3         {
  
        4             return (object)obj.GetValue(SubmitButtonProperty);
  
        5         }
  
        6 
  
        7         public static void SetSubmitButton(DependencyObject obj, object value)
  
        8         {
  
        9             obj.SetValue(SubmitButtonProperty, value);
  
       10         }
  
       11 
  
       12         // Using a DependencyProperty as the backing store for SubmitButton.  This enables animation, styling, binding, etc...
  
       13         public static readonly DependencyProperty SubmitButtonProperty =
  
       14             DependencyProperty.RegisterAttached("SubmitButton", typeof(object), typeof(AttachProperties), new PropertyMetadata(SubmitButtonChanged));
  
       15 
  
       16         private static void SubmitButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
  
       17         {
  
       18             var button = (ButtonBase)e.NewValue;
  
       19             var form = d as UIElement;
  
       20             form.KeyDown += (s, se) =>
  
       21             {
  
       22                 if (se.Key == Key.Enter)
  
       23                 {
  
       24                     button.Focus();
  
       25                     if (button.Command != null)
  
       26                        button.Dispatcher.BeginInvoke(()=>  button.Command.Execute(null));
  
       27                 }
  
       28             };
  
       29         }
  
       30         #endregion