VB.Net - 數(shù)據(jù)類型

數(shù)據(jù)類型指用于聲明不同類型的變量或函數(shù)的擴(kuò)展系統(tǒng)。 變量的類型確定它在存儲(chǔ)中占用多少空間以及如何解釋存儲(chǔ)的位模式。

VB.Net中提供的數(shù)據(jù)類型

VB.Net提供了多種數(shù)據(jù)類型。下表顯示的所有數(shù)據(jù)類型可用的：

示例

下面的示例演示使用的一些類型︰

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

當(dāng)上述代碼被編譯和執(zhí)行時(shí)，它產(chǎn)生了以下結(jié)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中的類型轉(zhuǎn)換函數(shù)

VB.Net提供以下內(nèi)聯(lián)類型轉(zhuǎn)換函數(shù)：

示例：

下面的例子演示了其中的一些功能：

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

當(dāng)上述代碼被編譯和執(zhí)行時(shí)，它產(chǎn)生了以下結(jié)果：

True
-1
True
12/4/2012
1
1