C# 4.0 Pocket Reference by Ben Albahari, Joseph Albahari

By Ben Albahari, Joseph Albahari

When you're programming C# 4.0 and wish a bit aid, this tightly concentrated and functional e-book tells you precisely what you must be aware of -- with out lengthy introductions or bloated examples. It's excellent as a succinct speedy reference or as a advisor to get you swiftly in control for those who already comprehend Java, C++, or an past model of C#.

Written through the authors of the acclaimed C# 4.0 in a Nutshell (O’Reilly), this ebook covers the full C# 4.0 language -- with no skimping at the info -- together with:
<UL> * beneficial properties new to C# 4.0, akin to dynamic binding, not obligatory and named parameters, and kind parameter variance
* All of C#'s basics
* complex themes, together with operator overloading, customized conversions, variety constraints, covariance and contravariance, lambda expressions and closures, iterators, nullable kinds, and operator lifting
* LINQ, beginning with sequences, lazy execution, and conventional question operators; completing with a whole connection with question expressions
* hazardous code and tips, customized attributes, preprocessor directives, and XML documentation
</UL>

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Com> Jagged arrays Jagged arrays are declared using successive square brackets to represent each dimension. Here is an example of declaring a jagged two-dimensional array, where the outermost dimension is 3: int[][] matrix = new int[3][]; The inner dimensions aren’t specified in the declaration. Unlike a rectangular array, each inner array can be an arbitrary length. Each inner array is implicitly initialized to null rather than an empty array. 0 Pocket Reference Download from Library of Wow! com> Another approach is to omit the type name after the new keyword, and have the compiler infer the array type.

WriteLine (x == z); // False // True For reference types, equality, by default, is based on reference, as opposed to the actual value of the underlying object. Therefore, two instances of an object with identical data are not considered equal unless the == operator for that type is specially overloaded to that effect (see the section “The object Type” on page 78 and the section “Operator Overloading” on page 135). =, <, >, >=, and <=, work for all numeric types, but should be used with caution with real numbers (see “Real Number Rounding Errors” on page 25 in the previous section).

If the compiler is able to infer the type from the initialization expression, you can use the word var in place of the type declaration. PI; Because of this direct equivalence, implicitly typed variables are statically typed. 0 Pocket Reference Download from Library of Wow! com> var x = 5; x = "hello"; // Compile-time error; x is of type int In the section “Anonymous Types” on page 140, we describe a scenario where the use of var is mandatory. Expressions and Operators An expression essentially denotes a value.

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