C# 4.0 Pocket Reference by Ben Albahari, Joseph Albahari

By Ben Albahari, Joseph Albahari

When you're programming C# 4.0 and want a bit aid, this tightly centred and sensible e-book tells you precisely what you must recognize -- with out lengthy introductions or bloated examples. It's excellent as a succinct speedy reference or as a advisor to get you speedily on top of things if you happen to already understand Java, C++, or an previous model of C#.

Written through the authors of the acclaimed C# 4.0 in a Nutshell (O’Reilly), this publication covers the complete C# 4.0 language -- with no skimping at the information -- together with:
<UL> * positive factors new to C# 4.0, resembling dynamic binding, non-compulsory and named parameters, and sort parameter variance
* All of C#'s basics
* complex issues, together with operator overloading, customized conversions, sort constraints, covariance and contravariance, lambda expressions and closures, iterators, nullable varieties, and operator lifting
* LINQ, beginning with sequences, lazy execution, and traditional question operators; completing with a whole connection with question expressions
* dangerous code and tips, customized attributes, preprocessor directives, and XML documentation

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A statement block is a series of statements appearing between braces (the {} tokens). Declaration Statements A declaration statement declares a new variable, optionally initializing the variable with an expression. A declaration statement ends in a semicolon. You may declare multiple variables of the same type in a comma-separated list. 99792458E08; Local variable scope The scope of a local or constant variable extends throughout the current block. You cannot declare another local variable with the same name in the current block or in any nested blocks.

The parameter type must be declared as an array. WriteLine (Sum (1, 2, 3, 4)); // 10 You can also supply a params argument as an ordinary array. 0, methods, constructors, and indexers can declare optional parameters. WriteLine (x); } Optional parameters may be omitted when calling the method: Foo(); // 23 The default argument of 23 is actually passed to the optional parameter x—the compiler bakes the value 23 into the compiled code at the calling side. The preceding call to Foo is semantically identical to: Foo (23); because the compiler simply substitutes the default value of an optional parameter wherever it is used.

Notice how the ref modifier is required both when writing and when calling the method. This makes it very clear what’s going on. NOTE A parameter can be passed by reference or by value, regardless of whether the parameter type is a reference type or a value type. The out modifier An out argument is like a ref argument, except it: • Need not be assigned before going into the function • Must be assigned before it comes out of the function Variables and Parameters | 39 Download from Library of Wow!

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