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()
