Version.CompareTo Method (Version)

Compares the current Version object to a specified Version object and returns an indication of their relative values.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Function CompareTo ( _
	value As Version _
) As Integer

Parameters

value
Type: System.Version
A Version object to compare to the current Version object, or Nothing.

Return Value

Type: System.Int32

Return Value

Description

Less than zero

The current Version object is a version before value.

Zero

The current Version object is the same version as value.

Greater than zero

The current Version object is a version subsequent to value.

-or-

value is Nothing.

Implements

IComparable(Of T).CompareTo(T)

This method implements the System.IComparable(Of T) interface, and performs slightly better than the CompareTo method because it does not have to unbox the value parameter.

The components of Version in decreasing order of importance are: major, minor, build, and revision. An unknown component is assumed to be older than any known component. For example:

  • Version 1.1 is older than version 1.1.0.

  • Version 1.1 is older than version 1.1.1.

  • Version 1.1 is older than version 1.1.2.3.

  • Version 1.1.2 is older than version 1.1.2.4.

  • Version 1.2.5 is newer than version 1.2.3.4.

The following code example demonstrates generic and nongeneric versions of the CompareTo method for several value and reference types.


' This example demonstrates the generic and non-generic versions of the 
' CompareTo method for several base types.
' The non-generic version takes a parameter of type Object, while the generic
' version takes a type-specific parameter, such as Boolean, Int32, or Double.


Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim nl As String = vbCrLf
      Dim msg As String = _
          "{0}The following is the result of using the generic and non-generic{0}" & _
          "versions of the CompareTo method for several base types:{0}"

      Dim now As DateTime = DateTime.Now
      ' Time span = 11 days, 22 hours, 33 minutes, 44 seconds
      Dim tsX As New TimeSpan(11, 22, 33, 44)
      ' Version = 1.2.333.4
      Dim versX As New Version("1.2.333.4")
      ' Guid = CA761232-ED42-11CE-BACD-00AA0057B223
      Dim guidX As New Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}")

      Dim a1 As [Boolean] = True, a2 As [Boolean] = True
      Dim b1 As [Byte] = 1, b2 As [Byte] = 1
      Dim c1 As Int16 = -2, c2 As Int16 = 2
      Dim d1 As Int32 = 3, d2 As Int32 = 3
      Dim e1 As Int64 = 4, e2 As Int64 = -4
      Dim f1 As [Decimal] = -5.5D, f2 As [Decimal] = 5.5D
      Dim g1 As [Single] = 6.6F, g2 As [Single] = 6.6F
      Dim h1 As [Double] = 7.7, h2 As [Double] = -7.7
      Dim i1 As [Char] = "A"c, i2 As [Char] = "A"c
      Dim j1 As String = "abc", j2 As String = "abc"
      Dim k1 As DateTime = now, k2 As DateTime = now
      Dim l1 As TimeSpan = tsX, l2 As TimeSpan = tsX
      Dim m1 As Version = versX, m2 As New Version("2.0")
      Dim n1 As Guid = guidX, n2 As Guid = guidX

      ' The following types are not CLS-compliant.
      ' SByte, UInt16, UInt32, UInt64

      outputBlock.Text &= String.Format(msg, nl) & vbCrLf
      Try
         ' The second and third Show method call parameters are automatically boxed because
         ' the second and third Show method declaration arguments expect type Object.

         Show(outputBlock, "Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo(CObj(a2)))
         Show(outputBlock, "Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo(CObj(b2)))
         Show(outputBlock, "Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo(CObj(c2)))
         Show(outputBlock, "Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo(CObj(d2)))
         Show(outputBlock, "Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo(CObj(e2)))
         Show(outputBlock, "Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo(CObj(f2)))
         Show(outputBlock, "Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo(CObj(g2)))
         Show(outputBlock, "Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo(CObj(h2)))
         Show(outputBlock, "Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo(CObj(i2)))
         Show(outputBlock, "String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo(CObj(j2)))
         Show(outputBlock, "DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo(CObj(k2)))
         Show(outputBlock, "TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo(CObj(l2)))
         Show(outputBlock, "Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo(CObj(m2)))
         Show(outputBlock, "Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo(CObj(n2)))
         '
         outputBlock.Text &= String.Format("{0}The following types are not CLS-compliant:", nl) & vbCrLf
         outputBlock.Text &= String.Format("SByte, UInt16, UInt32, UInt64") & vbCrLf

      Catch e As Exception
         outputBlock.Text &= e.GetType().Name & vbCrLf
      End Try
   End Sub 'Main

   Public Shared Sub Show(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal caption As String, ByVal var1 As [Object], ByVal var2 As [Object], _
                          ByVal resultGeneric As Integer, ByVal resultNonGeneric As Integer)
      Dim relation As String

      outputBlock.Text &= caption
      If resultGeneric = resultNonGeneric Then
         If resultGeneric < 0 Then
            relation = "less than"
         ElseIf resultGeneric > 0 Then
            relation = "greater than"
         Else
            relation = "equal to"
         End If
         outputBlock.Text &= String.Format("{0} is {1} {2}", var1, relation, var2) & vbCrLf

         ' The following condition will never occur because the generic and non-generic
         ' CompareTo methods are equivalent.

      Else
         outputBlock.Text &= String.Format("Generic CompareTo = {0}; non-generic CompareTo = {1}", _
                            resultGeneric, resultNonGeneric) & vbCrLf
      End If
   End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'The following is the result of using the generic and non-generic versions of the
'CompareTo method for several base types:
'
'Boolean:  True is equal to True
'Byte:     1 is equal to 1
'Int16:    -2 is less than 2
'Int32:    3 is equal to 3
'Int64:    4 is greater than -4
'Decimal:  -5.5 is less than 5.5
'Single:   6.6 is equal to 6.6
'Double:   7.7 is greater than -7.7
'Char:     A is equal to A
'String:   abc is equal to abc
'DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
'TimeSpan: 11.22:33:44 is equal to 11.22:33:44
'Version:  1.2.333.4 is less than 2.0
'Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
'aa0057b223
'
'The following types are not CLS-compliant:
'SByte, UInt16, UInt32, UInt64
'


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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