本文整理汇总了VB.NET中System.Text.UTF8Encoding.GetPreamble方法的典型用法代码示例。如果您正苦于以下问题：VB.NET UTF8Encoding.GetPreamble方法的具体用法？VB.NET UTF8Encoding.GetPreamble怎么用？VB.NET UTF8Encoding.GetPreamble使用的例子？那么恭喜您, 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类System.Text.UTF8Encoding的用法示例。
在下文中一共展示了UTF8Encoding.GetPreamble方法的2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，您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。
示例1: Example
' 导入命名空间
Imports System.Text
Module Example
Public Sub Main()
' The default constructor does not provide a preamble.
Dim UTF8NoPreamble As New UTF8Encoding()
Dim UTF8WithPreamble As New UTF8Encoding(True)
Dim preamble() As Byte
preamble = UTF8NoPreamble.GetPreamble()
Console.WriteLine("UTF8NoPreamble")
Console.WriteLine(" preamble length: {0}", preamble.Length)
Console.Write(" preamble: ")
ShowArray(preamble)
Console.WriteLine()
preamble = UTF8WithPreamble.GetPreamble()
Console.WriteLine("UTF8WithPreamble")
Console.WriteLine(" preamble length: {0}", preamble.Length)
Console.Write(" preamble: ")
ShowArray(preamble)
End Sub
Public Sub ShowArray(bytes As Byte())
For Each b In bytes
Console.Write("{0:X2} ", b)
Next
Console.WriteLine()
End Sub
End Module
开发者ID:VB.NET开发者，项目名称:System.Text，代码行数:32，代码来源:UTF8Encoding.GetPreamble 输出：
UTF8NoPreamble
preamble length: 0
preamble:
UTF8WithPreamble
preamble length: 3
preamble: EF BB BF
示例2: Example
' 导入命名空间
Imports System.IO
Imports System.Text
Module Example
Public Sub Main()
Dim s As String = "This is a string to write to a file using UTF-8 encoding."
' Write a file using the default constructor without a BOM.
Dim enc As New UTF8Encoding()
Dim bytes() As Byte = enc.GetBytes(s)
WriteToFile("NoPreamble.txt", enc, bytes)
' Use BOM.
enc = New UTF8Encoding(True)
WriteToFile("Preamble.txt", enc, bytes)
End Sub
Private Sub WriteToFile(fn As String, enc As Encoding, bytes As Byte())
Dim fs As New FileStream(fn, FileMode.Create)
Dim preamble() As Byte = enc.GetPreamble()
fs.Write(preamble, 0, preamble.Length)
Console.WriteLine("Preamble has {0} bytes", preamble.Length)
fs.Write(bytes, 0, bytes.Length)
Console.WriteLine("Wrote {0} bytes to {1}.", fs.Length, fn)
fs.Close()
Console.WriteLine()
End Sub
End Module
开发者ID:VB.NET开发者，项目名称:System.Text，代码行数:29，代码来源:UTF8Encoding.GetPreamble 输出：
Preamble has 0 bytes
Wrote 57 bytes to NoPreamble.txt.
Preamble has 3 bytes
Wrote 60 bytes to Preamble.txt.
注：本文中的System.Text.UTF8Encoding.GetPreamble方法示例整理自Github/MSDocs等源码及文档管理平台，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。 |
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