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：
  1  < 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

View Code

 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
  1  < 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