Wpf usercontrol with parameterized constructor

Question

We use Microsoft Unity and dependent injection, so we have a parameterized constructor for usercontrol. How to insert this dependency in usercontrol using XAML?

I added usercontrol to XAML as shown below.

xmlns:usrRefundArrivalProcessor="Ttl.Refunds.Wpf.Dashboad.Application.Usercontrols;assembly=Ttl.Refunds.Wpf.Dashboad.Application"

Answer 1

Including dependencies does not imply parameterized constructors. In fact, if you look at the samples that come with Unity, most of the dependency injection is done with properties with the [Dependency] attribute.

Unity XAML, . UserControl , [Dependency], XAML.

public class MyUserControl : UserControl
{
  [Dependency]
  public ISomething Something { get; set; }

  [Dependency]
  public IWhatever Whatever { get { return (IWhatever)GetValue(WhateverProperty); } set { SetValue(WhateverProperty, value); }
  public readonly DependencyProperty WhateverProperty = DependencyProperty.Register("Whatever", typeof(IWhatever), typeof(MyUserControl));

  ...
}

, [Dependency] DependencyProperty, CLR, . , .

UnityContainer XAML , "UnityHelper.Container", PropertyChangedCallback BuildUp :

public class UnityHelper
{
  public static IUnityContainer GetContainer(DependencyObject obj) { return (IUnityContainer)obj.GetValue(ContainerProperty); }
  public static void SetContainer(DependencyObject obj, IUnityContainer value) { obj.SetValue(ContainerProperty, value); }
  public static readonly DependencyProperty ContainerProperty = DependencyProperty.RegisterAttached("Container", typeof(IUnityContainer), typeof(UnityHelper), new FrameworkPropertyMetadata
  {
    Inherits = true,
    PropertyChangedCallback = (obj, e) =>
    {
      var container = e.NewValue as IUnityContainer;
      if(container!=null)
      {
        var element = obj as FrameworkElement;
        container.BuildUp(obj.GetType(), obj, element==null ? null : element.Name);
      }
    }
  });
}

UnityContainer , , , :

UnityHelper.SetContainer(this, new UnityContainer() ...);

XAML :

<UserControl ...
  my:UnityHelper.Container="{DynamicResource MainUnityContainer}" />

, , , WPF 98% , Unity . , Unity MVVM. , MVVM , , , , Unity .

Answer 2

. " " UserControl? , , . , , , .

Answer 3

, , WPF. Inherits = true , GUI PropertyChangedCallback , , GUI Unity. , , , GUI " " . , UnityInjection .

, UnityInjection codebehind, , MVVM. MVVM, ViewModel , XAML, . ViewModel () Unity, . , .