So I am migrating some code from VB.NET to C# however it fails when it is doing a byte parse in C#.
here is the VB.NET code would works:
Dim sModifiedAccountNumber_AsciiHex
Dim iByte As Byte = 0
Dim iIdx As Integer = 0
Dim strByte As String = String.Empty
sModifiedAccountNumber_AsciiHex = "FC13"
For iIdx = 1 To 3 Step 2
iByte = CByte("&H" & Mid$(sModifiedAccountNumber_AsciiHex, iIdx, 2))
If iByte >= 120 And iByte <= 127 Then
iByte = iByte Or &H80
strByte = Hex$(iByte)
Do While Len(strByte) < 2
strByte = "0" & strByte
Loop
Mid$(sModifiedAccountNumber_AsciiHex, iIdx, 2) = strByte
End If
Next
The C# version:
string modAccountNumberAsciiHex = "FC13";
byte iByte;
string strByte = string.Empty;
for (int iIdx = 1; iIdx <= 3; iIdx += 2)
{
iByte = byte.Parse(("&H" + modAccountNumberAsciiHex.Substring((iIdx - 1), 2)));
if (iByte >= 120 && iByte <= 127)
{
iByte = iByte |= 0x80;
strByte = BitConverter.ToString(new byte[] { iByte });
while (strByte.Length < 2)
{
strByte = "0" + strByte;
}
// TODO: convert the line below to C#
// Mid$(sModifiedAccountNumber_AsciiHex, iIdx, 2) = strByte
}
}
so in C# I always get a FormatException
when doing the byte.Parse
(line straight after the for statement)
Any thoughts on what this should be in C#?
In addition - the C# version in the TODO comment would also be appreciated :-)
The mistake is including the "&H" at the start of the string, and using byte.Parse
without specifying NumberStyles.AllowHexSpecifier
. It would be simpler to use Convert.ToByte
though:
byte x = Convert.ToByte(modAccountNumberAsciiHex.Substring(iIdx - 1, 2), 16)
Also note that your code is currently very "1-based". It feels like ported VB. More idiomatic C# would be:
for (int index = 0; index < 3; index += 2)
{
byte x = Convert.ToByte(text.Substring(index, 2), 16);
...
}
您无需在C#中包含“&H”:
byte.Parse((modAccountNumberAsciiHex.Substring((iIdx - 1), 2)));
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