VB.Net - 数据类型

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数据类型是指用于声明不同类型的变量或函数的广泛系统。变量的类型决定了它在存储中占用多少空间以及如何解释存储的位模式。

VB.Net 中可用的数据类型

VB.Net 提供了广泛的数据类型。下表显示了所有可用的数据类型 -

例子

以下示例演示了某些类型的使用 -

Module DataTypes
   Sub Main()
      Dim b As Byte
      Dim n As Integer
      Dim si As Single
      Dim d As Double
      Dim da As Date
      Dim c As Char
      Dim s As String
      Dim bl As Boolean
      
      b = 1
      n = 1234567
      si = 0.12345678901234566
      d = 0.12345678901234566
      da = Today
      c = "U"c
      s = "Me"
      
      If ScriptEngine = "VB" Then
         bl = True
      Else
         bl = False
      End If
      
      If bl Then
         'the oath taking
         Console.Write(c & " and," & s & vbCrLf)
         Console.WriteLine("declaring on the day of: {0}", da)
         Console.WriteLine("We will learn VB.Net seriously")
         Console.WriteLine("Lets see what happens to the floating point variables:")
         Console.WriteLine("The Single: {0}, The Double: {1}", si, d)
      End If
      Console.ReadKey()
   End Sub
End Module

当上面的代码被编译并执行时，它会产生以下结果 -

U and, Me
declaring on the day of: 12/4/2012 12:00:00 PM
We will learn VB.Net seriously
Lets see what happens to the floating point variables:
The Single:0.1234568, The Double: 0.123456789012346

VB.Net 中的类型转换函数

VB.Net 提供以下内联类型转换函数 -

例子

以下示例演示了其中一些功能 -

Module DataTypes
   Sub Main()
      Dim n As Integer
      Dim da As Date
      Dim bl As Boolean = True
      n = 1234567
      da = Today
      
      Console.WriteLine(bl)
      Console.WriteLine(CSByte(bl))
      Console.WriteLine(CStr(bl))
      Console.WriteLine(CStr(da))
      Console.WriteLine(CChar(CChar(CStr(n))))
      Console.WriteLine(CChar(CStr(da)))
      Console.ReadKey()
   End Sub
End Module

当上面的代码被编译并执行时，它会产生以下结果 -

True
-1
True
12/4/2012
1
1