C# 4.0 Dynamic

One of the core features introduced in C# 4.0 is called Dynamic Lookup which allows a unified approach to invoking things dynamically. C# 3.0 was all about Language Integrated Query (LINQ) and C# 4.0 is all about dynamic programming. C# 4.0 brings some of flexibility and declarative style of programming to C#. C# 4.0 features a new dynamic keyword that allows you to mix in a bit of late-bound code in the midst of your otherwise statically typed code. It is used as a data type in much the same way the var keyword is used. The biggest reason is that it allows a C# program to use dynamic dispatch to more naturally create objects coming from a dynamic language.

As an example, suppose you have a method like this:

Code:

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public dynamic myMethod()
{
    // Get your work done here...
}

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and you call it as:

Code:

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dynamic callMethod = myMethod();
callMethod.Do("Your Job");

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The C# 4.0 compiler allows you to call a method with any name and any arguments because callMethod is declared as "dynamic".

Does that means C# 4.0 is lacking the statically typed language? Because if you don't mention the datatype of a variable, there should be an error saying data type is missing. If C# 4.0 gives us so much of flexibility then no one will mention any data type and will simply use "dynamic" keyword.

Well, no. The basic idea behind this is to provide flexibility to write C# code which talks to objects (or APIs). The "dynamic" operand differs compile-time declaration with run-time. At run-time the "dynamic" is replaced with the actual datatype. So if a variable is assigned a value of "1", the datatype will automatically be converted to "System.Int32".