' 导入命名空间
Imports System.IO
Imports System.Text

Module MemStream

    Sub Main()
    
        Dim count As Integer
        Dim byteArray As Byte()
        Dim charArray As Char()
        Dim uniEncoding As New UnicodeEncoding()

        ' Create the data to write to the stream.
        Dim firstString As Byte() = _
            uniEncoding.GetBytes("Invalid file path characters are: ")
        Dim secondString As Byte() = _
            uniEncoding.GetBytes(Path.GetInvalidPathChars())

        Dim memStream As New MemoryStream(100)
        Try
            ' Write the first string to the stream.
            memStream.Write(firstString, 0 , firstString.Length)

            ' Write the second string to the stream, byte by byte.
            count = 0
            While(count < secondString.Length)
                memStream.WriteByte(secondString(count))
                count += 1
            End While
            
            ' Write the stream properties to the console.
            Console.WriteLine( _
                "Capacity = {0}, Length = {1}, Position = {2}", _
                memStream.Capacity.ToString(), _
                memStream.Length.ToString(), _
                memStream.Position.ToString())

            ' Set the stream position to the beginning of the stream.
            memStream.Seek(0, SeekOrigin.Begin)

            ' Read the first 20 bytes from the stream.
            byteArray = _
                New Byte(CType(memStream.Length, Integer)){}
            count = memStream.Read(byteArray, 0, 20)

            ' Read the remaining Bytes, Byte by Byte.
            While(count < memStream.Length)
                byteArray(count) = _
                    Convert.ToByte(memStream.ReadByte())
                count += 1
            End While

            ' Decode the Byte array into a Char array 
            ' and write it to the console.
            charArray = _
                New Char(uniEncoding.GetCharCount( _
                byteArray, 0, count)){}
            uniEncoding.GetDecoder().GetChars( _
                byteArray, 0, count, charArray, 0)
            Console.WriteLine(charArray)
        Finally
            memStream.Close()
        End Try

    End Sub
End Module

' 导入命名空间
Imports System.IO
Imports System.Text
Imports System.Threading
        
Public Class Tester
    Public Shared Sub Main
        Dim bteRead() As Byte
        Dim bteArray(256) As Byte
        Dim myMemortStream As MemoryStream
        Dim myFileStream As FileStream
        Try
            myFileStream = New FileStream("test.vb", FileMode.Open, FileAccess.Read)
            ReDim bteRead(myFileStream.Length)
            myFileStream.Read(bteRead, 0, myFileStream.Length)
            myMemortStream = New MemoryStream(256)
            myMemortStream.Write(bteRead, 128, 256)

            bteArray = myMemortStream.ToArray()
            Console.WriteLine(Encoding.ASCII.GetString(bteArray))
            myMemortStream.Close()
            myFileStream.Close()
        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
    End Sub

    
End Class