250 chapter 10 tủ tài liệu training

Multidimensional ArraysOne dimensional array Multidimensional arrays... Attributes provide a powerful method of associating metadata, or declarative information, with code assemblies, ty

Multidimensional Arrays

One dimensional array Multidimensional arrays

Multidimensional Arrays

Row 0 some value [0,0] some value [0,1] some value[0,2]

Row 1 some value [1,0] some value [1,1] some value [1,2]

Row 2 some value [2,0] some value [2,1] some value [2,2]

Row 3 some value [3,0] some value [3,1] some value [3,2]

Multidimensional arrays exercise

Jagged arrays

Var vs dynamics

Var

Need to be initialized at declaration

Errors are caught at compile time

Intellisense is not available

Not type safe

Can be passed as a parameter.

Preprocessor directives

The preprocessor directives give instructions to the compiler to preprocess some information before actual compilation starts.

Assemblies

Assemblies are the building blocks of NET Framework applications An assembly is a collection of types

and resources that are built to work together and form a logical unit of functionality

Major Minor Build Revision

1.0.4.3

Attributes provide a powerful method of associating metadata, or declarative information, with code (assemblies, types, methods, properties etc).After an attribute is associated with a program entity, the attribute can be queried at run time by using a technique called reflection

Serialization and Deserialization

XML (Extensible Markup Language)

Defines a set of rules for encoding documents in a format that is both human-readable and machine-readable

Serialization and Deserialization

Serialization is the process of converting an object into a stream of bytes in order to store the object or transmit it to memory, a database, or a file Its main purpose is to save the state of an object in order to be able to recreate it when needed Deserialization is the reverse of this process.

Assignment No.20: (Say hi in 7 different languages)

• Create a list of threads

• Create a class called Hi contains 7 or so different SayHi methods in different languages

• Each SayHi method has a name and a count to display how many times

Ref return and ref local

Passing by value (using a copy) Passing by reference (using the variable itself)

IEnumerable and IEnumerator

• IEnumerable is an interface that defines one method GetEnumerator which returns an IEnumerator interface, which allows readonly access to a collection

• IEnumerable is some type (List or array) that you can loop through

• IEnumerable is read-only

• If you just need only to read, sort or filter your collection, IEnumerable is what you need

DLL files

A DLL (Dynamic Link Library) is a library that contains code and data that can be used by more than one program at the same time

Assignment No.23: (Multidimensional Arrays Assignment)

Assignment No.24: (Enhancement of Jagged Multidimensional Array)

• Create jagged array of multidimensional arrays

• Allow it to accept different types and sizes

• Fill it with data and display it.