#it3xl

Variant == Contravariant or Covariant. Invariant == NOT (Contravariant or Covariant) All next members of an interface will result in compilation errors. interface IVariant < out TReturn , in TArgument > {     // CS1961 Invalid variance:     // The type parameter 'TReturn' must be contravariantly valid on 'IVariant<TReturn, TArgument>.SetA(TReturn)'.     // 'TReturn' is covariant.     void SetA( TReturn smpleArg);     // CS1961 Invalid variance:     // The type parameter 'TArgument' must be covariantly valid on 'IVariant<TReturn, TArgument>.GetA()'.     // 'TArgument' is contravariant.     TArgument GetA();     // CS1961 Invalid variance:     // The type parameter 'TArgument' must be covariantly valid on 'IVariant<TReturn, TArgument>.GetASetR(TReturn)'.     // 'TA...

How to invoke an event or delegate handlers asynchronously Variant with the  Parallel class (TPL). public void OnMyEvent( String myValue) {     var multiCastDelegate = Interlocked .CompareExchange( ref MyEvent, null , null );     if (multiCastDelegate == null )      {         return ;      }     var handlers = multiCastDelegate.GetInvocationList()         .Cast< EventHandler < MyEventArgs >>();     var args = new MyEventArgs (myValue);     Parallel .ForEach(         handlers,         handler => handler( this , args)); }   Old variant with the Asynchronous delegates (APM). public void OnMyEventOld( String myValue) {     var multiCastDelegate = Interlocked .CompareExc...

Be aware of this. Silverlight 5. DataGrid DataGridTemplateColumn.CellTemplate Visibility (!!!) It doesn’t work, at all: Visibility ="{ Binding  Path = Detail,  Converter ={ StaticResou rce  VisibleNonEmptyConverter }} " This is working: Visibility ="{ Binding  Path = DataContext,  RelativeSource ={ R elativeSource  Self },  Converter ={ StaticResource   VisibleNonEmptyConverter }}" DataContext ="{ Binding  Path = Detail}" < data : DataGrid                ItemsSource ="{ Binding  Path = Items}"                AutoGenerateColumns ="False"                HeadersVisibility ="None"                Background ="Transparent"  ...

My modest projects. Formatted Input MVVM Workflow Close the ChildWindow by its Overlay MathNullable The Prism architecture lack for the Interactions! WcfContext - The Custom WCF Context State Pattern Implementation WorkflowCode - Workflow in a Code framework WPF application Single Instance in one line of code for usage

The predefined rules in the Windows Firewall have the fixed ports: World Wide Web Services (HTTP Traffic-In) - 80 World Wide Web Services (HTTPS Traffic-In) - 443 You should create your own rule and apply it for (!!!) all programs. Thanks for details from: Why does it have "Apply to all programs and services" and not just the "World Wide Web Publishing Service / W3SVC"? How to enable “World Wide Services (HTTP)” in the firewall using command line?

TODO It's empty. Advice is appreciated. In progress Introduction to RX Done The Little MongoDB Book , Karl Seguin RX MSDN Code Generation and T4 Text Templates

The notation will not create or change the internal object. That's it var  obj =  new   Obj        {               Inner = {CompanyName =  "Any name" }        }; Required that the inner object was created before of use. The full example:         class   Program        {               static   void  Main()              {                      var  obj =  new   Obj                            {      ...