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MSDN | Microsoft Development, Subscriptions, Resources, and More. Implementing Dynamic Interfaces. GetMetaObject() returns a new DynamicDictionaryMetaObject whenever it is called. Here’s where the first complexity enters the picture. GetMetaObject() is called every time any member of the DynamicDictionary is invoked. Call the same member 10 times, GetMetaObject() gets called 10 times. Even if your methods are statically defined in DynamicDictionary, GetMetaObject() will be called, and will intercept those methods to invoke possible dynamic behavior. Remember that dynamic objects are statically typed as dynamic, therefore have no compile time behavior defined. Every member access is dynamically dispatched. The DynamicMetaObject is responsible for building an Expression Tree that executes whatever code is necessary to handle the dynamic invocation.

BindSetMember constructs an expression tree that will call DynamicDictionary.SetDictionaryEntry() to set a value in the dictionary. Metaprogramming quickly gets confusing, so let’s walk through this slowly. Asynchronous Programming for C# and Visual Basic. You can avoid performance bottlenecks and enhance the overall responsiveness of your application by using asynchronous programming.

However, traditional techniques for writing asynchronous applications can be complicated, making them difficult to write, debug, and maintain. Visual Studio 2012 introduces a simplified approach, async programming, that leverages asynchronous support in the .NET Framework 4.5 and the Windows Runtime. The compiler does the difficult work that the developer used to do, and your application retains a logical structure that resembles synchronous code.

As a result, you get all the advantages of asynchronous programming with a fraction of the effort. This topic contains the following sections. This topic provides an overview of when and how to use async programming and includes links to support topics that contain details and examples. Asynchrony is essential for activities that are potentially blocking, such as when your application accesses the web. Reference. C# - How do I make event callbacks into my win forms thread safe.