Code123Generator.linq

var startSymbol = "Ë";
var encodedData = "177345239061003";
var checkSymbol = "";
var stopSymbol  = "Î";

// 預設使用 Code Set A ( 128A ) 字元集
Code128Type type = Code128Type.CodeSetA;

// 如果有小寫字元就改用 Code Set B ( 128B ) 字元集
if (Regex.IsMatch(encodedData, "[a-z]"))
{
	type = Code128Type.CodeSetB;
}

var checksum = 0;
switch (type)
{
	case Code128Type.CodeSetA:
		startSymbol = "Ë";
		checksum = 103;
		break;
	case Code128Type.CodeSetB:
		startSymbol = "Ì";
		checksum = 104;
		break;
	case Code128Type.CodeSetC:
		startSymbol = "Í";
		checksum = 105;
		break;
	default:
		throw new ArgumentException("錯誤的 Code128Type 類型", "type");
}

var chars = encodedData.ToCharArray();

for (int i = 0; i < chars.Length; i++)
{
	var position = i + 1;
	var value = 0;
	var asciiasc = (int)chars[i];
	if (asciiasc >= 32)
	{
		value = asciiasc - 32;
		checksum += value * position;
	}
	else
	{
		value = asciiasc + 64;
		checksum += value * position;
	}
	//$"Value: {value}".Dump();
	//$"Checksum: {checksum}".Dump();
}

checksum = checksum % 103;

//checksum.Dump();

if (checksum < 95)
{
	checkSymbol = char.ConvertFromUtf32(checksum + 32);
}
else
{
	checkSymbol = char.ConvertFromUtf32(checksum + 100);
}

var result = startSymbol + encodedData + checkSymbol + stopSymbol;

result.Dump();

public enum Code128Type
{
	CodeSetA,
	CodeSetB,
	CodeSetC
}