C# 如何计算校验和
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How to calculate checksum
提问by Rikin Patel
I m developing instrument driver and i want to know how to calculate checksum of frame.
我正在开发仪器驱动程序，我想知道如何计算帧的校验和。
Explanation:
解释：
Expressed by characters [0-9] and [A-F].
Characters beginning from the character after [STX] and until [ETB] or [ETX] (including [ETB] or [ETX]) are added in binary.
The 2-digit numbers, which represent the least significant 8 bits in hexadecimal code, are converted to ASCII characters [0-9] and [A-F].
The most significant digit is stored in CHK1 and the least significant digit in CHK2.
用字符 [0-9] 和 [AF] 表示。
从 [STX] 之后的字符开始到 [ETB] 或 [ETX]（包括 [ETB] 或 [ETX]）的字符以二进制形式添加。
代表十六进制代码中最低有效 8 位的 2 位数字被转换为 ASCII 字符 [0-9] 和 [AF]。
最高有效位存储在 CHK1 中，最低有效位存储在 CHK2 中。
i am not getting above 3rd and 4th point.
我没有超过第 3 点和第 4 点。
can any one provide sample code for c#.
谁能提供c#的示例代码。
Please help me.
请帮我。
采纳答案by Rikin Patel
Finally I got answer, here is the code for calculating checksum:
最后我得到了答案，这是计算校验和的代码：
private string CalculateChecksum(string dataToCalculate)
{
byte[] byteToCalculate = Encoding.ASCII.GetBytes(dataToCalculate);
int checksum = 0;
foreach (byte chData in byteToCalculate)
{
checksum += chData;
}
checksum &= 0xff;
return checksum.ToString("X2");
}
回答by Barak Rosenfeld
private bool CheckChecksum(string data)
{
bool isValid =false
byte[] byteToCalculate = Encoding.ASCII.GetBytes(dataToCalculate);
int checkSum = 0;
for ( int i=i i<byteToCalculate.Length;i++)
{
checkSum += byteToCalculate[i];
}
checksum &= 0xff;
if (checksum == byteToCalculate[ChecksumPlace]
{
return true
}
else
{
return false
}
}
回答by Aleksey
You can do this in one line:
您可以在一行中执行此操作：
return Encoding.ASCII.GetBytes(dataToCalculate).Aggregate((r, n) => r += n).ToString("X2");
