VB.Net学习笔记(面向对象的基本数据类型)

这些基本类型也象类一样拥有各自的方法和属性,熟练运用它们能让你的程序更优雅和更有面向对象的味道。

** 基本类型的重要方法和属性举例 **


Dim i As Int32

Dim s As String

Dim ss() As String

Dim by As Byte

Dim d As Double

Dim b As Boolean

Dim da As Date

Dim c As Char

Dim cc() As Char

' 整数操作

i = Int32.Parse(" ¥ 123", Globalization.NumberStyles.AllowCurrencySymbol) '123

i = Int32.MaxValue '2147483647

i = Int32.MinValue '-2147483648

by = Byte .Parse("1") '1

' 浮点数操作

d = Double .PositiveInfinity ' 正无穷大

d = Double .Epsilon '4.94065645841247E-324

' 布尔操作

s = Boolean .TrueString 'True

' 日期操作

da = Date .MaxValue '9999-12-31 23:59:59

da = Date .MinValue '0:00:00

da = Date .Now '2004-5-7 13:17:35

b = Date .IsLeapYear(2004) 'True

i = Date .DaysInMonth(2004, 5) '31

' 以下方法用于判断字符的特性

Char .IsControl(c)

Char .IsDigit(c)

Char .IsLetter(c)

Char .IsLetterOrDigit(c)

Char .IsLower(c)

Char .IsNumber(c)

Char .IsPunctuation(c)

Char .IsSeparator(c)

Char .IsSurrogate(c)

Char .IsSymbol(c)

Char .IsWhiteSpace(c)

Char .IsUpper(c)

'Char 转换

Char .ToLower(c)

Char .ToUpper(c)

' 字符串操作

cc = s.ToCharArray()

ss = s.Split(",")

s = s.Substring(5, 3)

s = s.Trim()

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