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VB.NET DateTimeOffset.ParseExact方法代码示例

本文整理汇总了VB.NET中System.DateTimeOffset.ParseExact方法的典型用法代码示例。如果您正苦于以下问题:VB.NET DateTimeOffset.ParseExact方法的具体用法?VB.NET DateTimeOffset.ParseExact怎么用?VB.NET DateTimeOffset.ParseExact使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在System.DateTimeOffset的用法示例。


在下文中一共展示了DateTimeOffset.ParseExact方法的5个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。

示例1: formats

Dim conIn As TextReader = Console.In
 Dim conOut As TextWriter = Console.Out
 Dim tries As Integer = 0
 Dim input As String = String.Empty
 Dim formats() As String = {"M/dd/yyyy HH:m zzz", "MM/dd/yyyy HH:m zzz", _
                            "M/d/yyyy HH:m zzz", "MM/d/yyyy HH:m zzz", _
                            "M/dd/yy HH:m zzz", "MM/dd/yy HH:m zzz", _
                            "M/d/yy HH:m zzz", "MM/d/yy HH:m zzz", _                                 
                            "M/dd/yyyy H:m zzz", "MM/dd/yyyy H:m zzz", _
                            "M/d/yyyy H:m zzz", "MM/d/yyyy H:m zzz", _
                            "M/dd/yy H:m zzz", "MM/dd/yy H:m zzz", _
                            "M/d/yy H:m zzz", "MM/d/yy H:m zzz", _                               
                            "M/dd/yyyy HH:mm zzz", "MM/dd/yyyy HH:mm zzz", _
                            "M/d/yyyy HH:mm zzz", "MM/d/yyyy HH:mm zzz", _
                            "M/dd/yy HH:mm zzz", "MM/dd/yy HH:mm zzz", _
                            "M/d/yy HH:mm zzz", "MM/d/yy HH:mm zzz", _                                 
                            "M/dd/yyyy H:mm zzz", "MM/dd/yyyy H:mm zzz", _
                            "M/d/yyyy H:mm zzz", "MM/d/yyyy H:mm zzz", _
                            "M/dd/yy H:mm zzz", "MM/dd/yy H:mm zzz", _
                            "M/d/yy H:mm zzz", "MM/d/yy H:mm zzz"}   
 Dim provider As IFormatProvider = CultureInfo.InvariantCulture.DateTimeFormat
 Dim result As DateTimeOffset

 Do 
    conOut.WriteLine("Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),")
    conOut.Write("Then press Enter: ")
    input = conIn.ReadLine()
    conOut.WriteLine() 
    Try
       result = DateTimeOffset.ParseExact(input, formats, provider, _
                                          DateTimeStyles.AllowWhiteSpaces)
       Exit Do
    Catch e As FormatException
       Console.WriteLine("Unable to parse {0}.", input)      
       tries += 1
    End Try
 Loop While tries < 3
 If tries >= 3 Then
    Console.WriteLine("Exiting application without parsing {0}", input)
 Else
    Console.WriteLine("{0} was converted to {1}", input, result.ToString())                                                     
 End If 
 ' Some successful sample interactions with the user might appear as follows:
 '    Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
 '    Then press Enter: 12/08/2007 6:54 -6:00
 '    
 '    12/08/2007 6:54 -6:00 was converted to 12/8/2007 6:54:00 AM -06:00         
 '    
 '    Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
 '    Then press Enter: 12/8/2007 06:54 -06:00
 '    
 '    12/8/2007 06:54 -06:00 was converted to 12/8/2007 6:54:00 AM -06:00
 '    
 '    Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
 '    Then press Enter: 12/5/07 6:54 -6:00
 '    
 '    12/5/07 6:54 -6:00 was converted to 12/5/2007 6:54:00 AM -06:00
开发者ID:VB.NET开发者,项目名称:System,代码行数:57,代码来源:DateTimeOffset.ParseExact

示例2:

Dim dateString, format As String  
Dim result As DateTimeOffset
Dim provider As CultureInfo = CultureInfo.InvariantCulture

' Parse date-only value with invariant culture and assume time is UTC.
dateString = "06/15/2008"
format = "d"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider, _
                                      DateTimeStyles.AssumeUniversal)
   Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try 

' Parse date-only value with leading white space.
' Should throw a FormatException because only trailing white space is  
' specified in method call.
dateString = " 06/15/2008"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider, _
                                      DateTimeStyles.AllowTrailingWhite)
   Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try 

' Parse date and time value, and allow all white space.
dateString = " 06/15/   2008  15:15    -05:00"
format = "MM/dd/yyyy H:mm zzz"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider, _
                                      DateTimeStyles.AllowWhiteSpaces)
   Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try 

' Parse date and time and convert to UTC.
dateString = "  06/15/2008 15:15:30 -05:00"   
format = "MM/dd/yyyy H:mm:ss zzz"       
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider, _
                                      DateTimeStyles.AllowWhiteSpaces Or _
                                      DateTimeStyles.AdjustToUniversal)
   Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try
开发者ID:VB.NET开发者,项目名称:System,代码行数:49,代码来源:DateTimeOffset.ParseExact

输出:

06/15/2008' converts to 6/15/2008 12:00:00 AM +00:00.
06/15/2008' is not in the correct format.
06/15/   2008  15:15    -05:00' converts to 6/15/2008 3:15:00 PM -05:00.
06/15/2008 15:15:30 -05:00' converts to 6/15/2008 8:15:30 PM +00:00.

示例3: Example

' 导入命名空间
Imports System.Globalization

Public Module Example
   Public Sub Main()
      Dim dateStrings() = { "2018-08-18T12:45:16.0000000Z",
                            "2018/08/18T12:45:16.0000000Z",
                            "2018-18-08T12:45:16.0000000Z",
                            "2018-08-18T12:45:16.0000000",                               
                            " 2018-08-18T12:45:16.0000000Z ",
                            "2018-08-18T12:45:16.0000000+02:00",
                            "2018-08-18T12:45:16.0000000-07:00" } 
      
      ParseWithISO8601(dateStrings, DateTimeStyles.None)
      Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
      ParseWithISO8601(dateStrings, DateTimeStyles.AllowWhiteSpaces)
      Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
      ParseWithISO8601(dateStrings, DateTimeStyles.AdjustToUniversal)
      Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
      ParseWithISO8601(dateStrings, DateTimeStyles.AssumeLocal)
      Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
      ParseWithISO8601(dateStrings, DateTimeStyles.AssumeUniversal)   
   End Sub

   Private Sub ParseWithISO8601(dateStrings() As String, styles As DateTimeStyles)
      Console.WriteLine($"Parsing with {styles}:")
      For Each dateStr In dateStrings
         Try 
            Dim dat = DateTimeOffset.ParseExact(dateString, "O", Nothing, styles)
            Console.WriteLine($"   {dateString,-35} --> {dat:yyyy-MM-dd HH:mm:ss.FF zzz}")
         catch e As FormatException
            Console.WriteLine($"   FormatException: Unable to convert '{dateString}'")
         End Try   
      Next 
   End Sub
End Module
开发者ID:VB.NET开发者,项目名称:System,代码行数:36,代码来源:DateTimeOffset.ParseExact

输出:

Parsing with None:
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'

-----

Parsing with AllowWhiteSpaces:
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'

-----

Parsing with AdjustToUniversal:
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'

-----

Parsing with AssumeLocal:
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'

-----

Parsing with AssumeUniversal:
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'
FormatException: Unable to convert '07-30-2018'

示例4:

Dim dateString, format As String  
Dim result As DateTimeOffset
Dim provider As CultureInfo = CultureInfo.InvariantCulture

' Parse date-only value with invariant culture.
dateString = "06/15/2008"
format = "d"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider)
   Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("{0} is not in the correct format.", dateString)
End Try 

' Parse date-only value without leading zero in month using "d" format.
' Should throw a FormatException because standard short date pattern of 
' invariant culture requires two-digit month.
dateString = "6/15/2008"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider)
   Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("{0} is not in the correct format.", dateString)
End Try 

' Parse date and time with custom specifier.
dateString = "Sun 15 Jun 2008 8:30 AM -06:00"
format = "ddd dd MMM yyyy h:mm tt zzz"        
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider)
   Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("{0} is not in the correct format.", dateString)
End Try 

' Parse date and time with offset without offset's minutes.
' Should throw a FormatException because "zzz" specifier requires leading  
' zero in hours.
dateString = "Sun 15 Jun 2008 8:30 AM -06"
Try
   result = DateTimeOffset.ParseExact(dateString, format, provider)
   Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
   Console.WriteLine("{0} is not in the correct format.", dateString)
End Try
开发者ID:VB.NET开发者,项目名称:System,代码行数:45,代码来源:DateTimeOffset.ParseExact

输出:

06/15/2008 converts to 6/15/2008 12:00:00 AM -07:00.
6/15/2008 is not in the correct format.
Sun 15 Jun 2008 8:30 AM -06:00 converts to 6/15/2008 8:30:00 AM -06:00.
Sun 15 Jun 2008 8:30 AM -06 is not in the correct format.

示例5: Example

Public Module Example
   Public Sub Main()
      Dim dateStrings() As String = { "2018-08-18T12:45:16.0000000Z",
                                      "2018/08/18T12:45:16.0000000Z",
                                      "2018-18-08T12:45:16.0000000Z",
                                      " 2018-08-18T12:45:16.0000000Z ",
                                      "2018-08-18T12:45:16.0000000+02:00",
                                      "2018-08-18T12:45:16.0000000-07:00" } 
      
      For Each dateStr In dateStrings
         Try 
            Dim dat = DateTimeOffset.ParseExact(dateStr, "O", Nothing)
            Console.WriteLine($"{dateStr,-35} --> {dat:yyyy-MM-dd HH:mm:ss.FF zzz}")
         Catch  e As FormatException
            Console.WriteLine($"FormatException: Unable to convert '{dateStr}'")
         End Try   
      Next 
   End Sub
End Module
开发者ID:VB.NET开发者,项目名称:System,代码行数:19,代码来源:DateTimeOffset.ParseExact

输出:

2018-08-18T12:45:16.0000000Z        --> 2018-08-18 12:45:16 +00:00
FormatException: Unable to convert '2018/08/18T12:45:16.0000000Z'
FormatException: Unable to convert '2018-18-08T12:45:16.0000000Z'
FormatException: Unable to convert ' 2018-08-18T12:45:16.0000000Z '
2018-08-18T12:45:16.0000000+02:00   --> 2018-08-18 12:45:16 +02:00
2018-08-18T12:45:16.0000000-07:00   --> 2018-08-18 12:45:16 -07:00


注:本文中的System.DateTimeOffset.ParseExact方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。