基于Silverlight的快速开发框架RapidSL新特性解析

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
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));
var assembly = new AssemblyPart().Load(sri.Stream);

InjectViewModelsToResources(assembly);

}
}

public static void InjectViewModelsToResources(Assembly assembly)
{
foreach (Type type in assembly.GetTypes())
{
var attributes = type.GetCustomAttributes(false);

foreach (var attribute in attributes)
{
if (attribute is StaticResourceAttribute)
{
var resourceKey = ((StaticResourceAttribute)attribute).Key;
if (string.IsNullOrEmpty(resourceKey))
resourceKey = type.Name;

var obj = Activator.CreateInstance(type);
if (!app.Resources.Contains(resourceKey))
app.Resources.Add(resourceKey, obj);
}
}
}
}

public static T GetViewModelFromResources<T>()
{
var key = typeof(T).Name;
if (app.Resources.Contains(key))
return (T)app.Resources[key];
else
return default(T);
}
}



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}">

<Button x:Name="submit" Content="登录" Margin="20,0,20,0" Padding="20,0,20,0" Command="{Binding UserLogin}"/>

</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);

}

// Using a DependencyProperty as the backing store for SubmitButton. This enables animation, styling, binding, etc...

public static readonly DependencyProperty SubmitButtonProperty =

DependencyProperty.RegisterAttached("SubmitButton", typeof(object), typeof(AttachProperties), new PropertyMetadata(SubmitButtonChanged));

private static void SubmitButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

{

var button = (ButtonBase)e.NewValue;

var form = d as UIElement;

form.KeyDown += (s, se) =>

{

if (se.Key == Key.Enter)

{

button.Focus();

if (button.Command != null)

button.Dispatcher.BeginInvoke(()=> button.Command.Execute(null));

}

};

}

#endregion