VB.Net - 資料型別

資料型別指的是一個廣泛的系統，用於宣告不同型別的變數或函式。變數的型別決定了它在儲存中佔據的空間大小以及如何解釋儲存的位模式。

VB.Net 中可用的資料型別

VB.Net 提供了廣泛的資料型別。下表顯示了所有可用的資料型別：

示例

以下示例演示了一些型別的用法：

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

編譯並執行上述程式碼後，將產生以下結果：

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 中的型別轉換函式

VB.Net 提供以下內聯型別轉換函式：

示例

以下示例演示了其中一些函式：

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

編譯並執行上述程式碼後，將產生以下結果：

True
-1
True
12/4/2012
1
1