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Recall that implicitly typed data is only possible for local variables in a member scope. The var keyword can never be used as a return value, a parameter or a member of a class/structure. This is not the case with the dynamic keyword however. Consider the following class definition: class VeryDynamicClass { // A dynamic field. private static dynamic myDynamicField; // A dynamic property. public dynamic DynamicProperty { get; set; } // A dynamic return type and a dynamic paramater type. public dynamic DynamicMethod(dynamic dynamicParam) { // A dynamic local variable. dynamic dynamicLocalVar = "Local variable"; int myInt = 10; if (dynamicParam is int) { return dynamicLocalVar; } else { return myInt; } } } You could now invoke the public members as expected, however as you are operating on dynamic methods and properties, you cannot be completely sure what the data type will be! To be sure, the VeryDynamicClass definition may not be very useful in a real world application, but it does illustrate the scope of where you can apply this C# keyword.

Table A-79. role_permission (user module)

While a great many things can be defined using the dynamic keyword, there are some limitations regarding its usage. While they are not show stoppers, do know that a dynamic data item cannot make use of lambda expressions or C# anonymous methods when calling a method. For example, the

following code will always result in errors, even if the target method does indeed take a delegate parameter which takes a string value and returns void. dynamic a = GetDynamicObject(); // Error! Methods on dynamic data can t use lambdas! a.Method(arg => Console.WriteLine(arg)); To circumvent this restriction, you will need to work with the underlying delegate directly, using the techniques described in 11 (anonymous methods and lambda expressions, etc). Another limitation is that a dynamic point of data cannot understand any extension methods (see 12). Unfortunately, this would also include any of the extension methods which come from the LINQ APIs. Therefore, a variable declared with the dynamic keyword has very limited use within LINQ to Objects and other LINQ technologies: dynamic a = GetDynamicObject(); // Error! Dynamic data can t find the Select() extension method! var data = from d in a select d;

rid int,

Given the fact that dynamic data is not strongly typed, not checked at compile time, has no ability to trigger IntelliSense and cannot be the target of a LINQ query, you are absolutely correct to assume that using the dynamic keyword just for the sake of doing so is very poor programming practice. However, in a few circumstances, the dynamic keyword can radically reduce the amount of code you need to author by hand. Specifically, if you are building a .NET application which makes heavy use of late binding (via reflection), the dynamic keyword can save you typing time. As well, if you are building a .NET application that needs to communicate with legacy COM libraries (such as Microsoft Office products), you can greatly simplify your codebase via the dynamic keyword. Like any shortcut, you need to weigh the pros and cons. The use of the dynamic keyword is a tradeoff between brevity of code, and type safety. While C# is a strongly typed language at its core, you can opt in (or opt out) dynamic behaviors on a call by call basis. Always remember that you never need to use the dynamic keyword. You could always get to the same end result by authoring alternative code by hand (and typically much more of it).

The Role of the Dynamic Language Runtime (DLR)

The {role}.rid to which the permissions are assigned A single permission granted to the role identified by rid The module declaring the permission

Now that you better understand what dynamic data is all about, let s learn how it is processed. With the release of .NET 4.0, the Common Language Runtime (CLR) has a complementary runtime environment named the Dynamic Language Runtime (DLR). The concept of a dynamic runtime is certainly not new. In fact, many programming languages such as Smalltalk, LISP, Ruby and Python have