dot.NET.Framework.Essentials.1002003,.3Ed [Electronic resources] نسخه متنی

Appendix C. Common Data Types

Each of the .NET
languages can provide its own keywords for the types it supports. For
example, a keyword for an integer in VB is
Integer, whereas in C# or C++ it is
int; a boolean is Boolean in
VB, but bool in C# or C++. In any case, the
integer is mapped to the class Int32, and the boolean is mapped to
the class Boolean in the System namespace. Table C-1 lists all simple
data types common to the .NET Framework. Non-CLS-compliant types are
not guaranteed to interoperate with all CLS-compliant languages.

Table C-1. Common data types
Type	Description
Boolean	True or false.
Byte	8-bit unsigned integer: 0 to 255.
Char	Character. Unicode 16-bit character.
DateTime	Represents a date and time value.
Decimal	Can represent positive and negative values with 28 significant digits: -79,228,162,514,264,337,593,543,950,335 to 79,228,162,514,264,337,593,543,950,335 .
Double	Stores 64-bit floating-point values: -1.79769313486231570e308 to 1.79769313486231570e308.
Guid	Represents a globally unique identifier (GUID); this is stored internally as a 128-bit integer. Commonly represented as a series of lowercase hexadecimal digits in groups of 8, 4, 4, 4, and 12 digits and separated by hyphens (e.g., 382c74c3-721d-4f34-80e5-57657b6cbc27).
Int16	Stores 16-bit signed integers: -32,768 to 32,767.
Int32	Stores 32-bit signed integers: -2,147,483,648 to 2,147,483,647.
Int64	Stores 64-bit signed integers: -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
SByte	Represents an 8-bit signed integer. The SByte type is not CLS-compliant. -128 to 127.
Single	Represents an IEEE 754f, single precision, 32-bit value: -3.40282346638528859e38 to 3.40282346638528859e38.
String	Represents a string of Unicode characters.
UInt16	Represents a 16-bit unsigned integer. The UInt16 type is not CLS- compliant. 0 to 65,535.
UInt32	Represents a 32-bit unsigned integer. The UInt32 type is not CLS- compliant. 0 to 4,294,967,295
UInt64	Represents a 64-bit unsigned integer. The UInt64 type is not CLS- compliant. The UInt64 data type can represent positive integers with 18 significant digits: 0 to 184,467,440,737,095,551,615.
Void	Void.

Table C-2 shows a number of useful container types
that the .NET Framework provides.

Table C-2. Container types
Type	Description
Array	General array construct.
ArrayList	This class implements the IList interface. The array can grow or shrink dynamically in size.
BitArray	This class represents a compact array of bit values. Each element represents a Boolean value (true/false).
HashTable	This class represents a collection of associated keys and values that are organized based on the hash code of the key.
Queue	This class represents a first-in, first-out collection construct.
SortedList	This class is similar to HashTable except that all elements are sorted by their actual keys (not hashed) and elements are accessible through either key or index.
Stack	This class represents a first-in, last-out stack construct.

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Appendix C. Common Data Types

Table C-1. Common data types

Table C-2. Container types