Byte Array LINQ

Question

I have a byte array which I want to check whether it contains a value

If m_bytInput(iPos - 1) = CRFIDSyrisPacket.RFIDSyrisLineEnd

I tried but it never evaluates to true even when there is 

           'm_bytInput.Any(Function(X) X =CRFIDSyrisPacket.RFIDSyrisLineEnd )

                    

Answer 1

Not much to go on here.  If m_bytInput is an array, and CRFIDSyrisPacket.RFIDSyrisLineEnd is A byte, then the Any method will return true.  As a test I wrote this to prove that it works.  As you will notice I tried several different byte values.

        Dim theChars As String = " !#$%&""'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
        'generate some bytes to TEST with
        Dim testBytes() As Byte = System.Text.Encoding.ASCII.GetBytes(theChars) 'convert chars to bytes
        'get byte to look for
        Dim look4This As Byte = testBytes(theChars.IndexOf("+"c))
        'Dim look4This As Byte = testBytes(theChars.IndexOf("±"c))
        'Dim look4This As Byte = 0 'not in the array

        Dim found As Boolean = testBytes.Any(Function(b) b = look4This)

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"Those who use Application.DoEvents() have no idea what it does and those who know what it does never use it." - MSDN User JohnWein    Multics - An OS ahead of its time.

Answer 2

The array is a byte array, I am comparing against an int value.  The problem is it does not pick up when there is a 

RFIDSyrisLineEnd 

Answer 3

 Why not just use the Contains method of the array?

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim bts() As Byte = {12, 0, 106, 25}
        If bts.Contains(106) Then
            MessageBox.Show("Contains 106")
        End If
    End Sub

 

 

 However,  if testing against an Enum,  you will need to convert the Enum member to a Byte to compare it.

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim bts() As Byte = {12, 0, 106, 25}
        If bts.Contains(CByte(SomeEnum.B)) Then
            MessageBox.Show("Contains 106")
        End If
    End Sub

End Class

Public Enum SomeEnum
    A = 10
    B = 106
    C = 228
End Enum

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If you say it can`t be done then i`ll try it

Answer 4

The array is a byte array, I am comparing against an int value.  The problem is it does not pick up when there is a 

RFIDSyrisLineEnd 

What is the value stored in the variable RFIDSyrisLineEnd? I am guessing it is > 255.

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"Those who use Application.DoEvents() have no idea what it does and those who know what it does never use it." - MSDN User JohnWein    Multics - An OS ahead of its time.