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The dynamic Primitive Type
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C# is a type-safe programming language . This means that all expressions resolve into an instance of a type and the compiler will generate only code that is attempting to perform an operation that is valid for this type . The benefit of a type-safe programming language over a non type-safe programming language is that many programmer errors are detected at compile time, helping to ensure that the code is correct before you attempt to execute it . In addition, compile-time languages can typically produce smaller and faster code since they make more assumptions at compile time and bake those assumptions into the resulting IL and metadata . However, there are also many occasions when a program has to act on information that it doesn t know about until it is running . While you can use type-safe programming languages (like C#) to interact with this information, the syntax tends to be clumsy, especially since you tend to work a lot with strings, and performance is hampered as well . If you are writing a pure C# application, then the only occasion you have for working with runtime-determined information is when you are using reflection (discussed in 23) . However, many developers also use C# to communicate with components that are not implemented in C# . Some of these components could be .NET-dynamic languages such as Python or Ruby, or COM objects that support the IDispatch interface (possibly implemented in native C or C++), or
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5 Primitive, Reference, and Value Types
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HTML Document Object Model (DOM) objects (implemented using various languages and technologies) . Communicating with HTML DOM objects is particularly useful when building a Microsoft Silverlight application . To make it easier for developers using reflection or communicating with other components, the C# compiler offers you a way to mark an expression s type as dynamic . You can also put the result of an expression into a variable and you can mark a variable s type as dynamic. This dynamic expression/variable can then be used to invoke a member such as a field, a property/indexer, a method, delegate, and unary/binary/conversion operators . When your code invokes a member using a dynamic expression/variable, the compiler generates special IL code that describes the desired operation . This special code is referred to as the payload . At runtime, the payload code determines the exact operation to execute based on the actual type of the object now referenced by the dynamic expression/variable . Here is some code to demonstrate what I m talking about:
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Private static class DynamicDemo { public static void Main() { for (Int32 demo = 0; demo < 2; demo++) { dynamic arg = (demo == 0) (dynamic) 5 : (dynamic) "A"; dynamic result = Plus(arg); M(result); } } private static dynamic Plus(dynamic arg) { return arg + arg; } private static void M(Int32 n) { Console.WriteLine("M(Int32): " + n); } private static void M(String s) { Console.WriteLine("M(String): " + s); } }
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When I execute Main, I get the following output:
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M(Int32): 10 M(String): AA
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To understand what s happening, let s start by looking at the Plus method . This method has declared its parameter s type as dynamic, and inside the method, the argument is used as the two operands to the binary + operator . Since arg is dynamic, the C# compiler emits payload code that will examine the actual type of arg at runtime and determine what the + operator should actually do . The first time Plus is called, 5 (an Int32), is passed, so Plus will return the value 10 (also an Int32) back to its caller . This puts this result in the result variable (declared as a dynamic type) . Then, the M method is called, passing it result . For the call to M, the compiler will emit payload code that will, at runtime, examine the actual type of the value being passed to M and determine which overload of the M method to call . When result contains an Int32, the overload of M that takes an Int32 parameter is called .
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