Detailed explanation of the sample code of C# binary byte stream search function IndexOf

C# Binary byte stream searchFunctionIndexOf

        /// 

        /// 报告指定的 System.Byte[] 在此实例中的第一个匹配项的索引。
        /// 
        /// 被执行查找的 System.Byte[]。
        /// 要查找的 System.Byte[]。
        /// 如果找到该字节数组，则为 searchBytes 的索引位置；如果未找到该字节数组，则为 -1。如果 searchBytes 为 null 或者长度为0，则返回值为 -1。
        internal int IndexOf(byte[] srcBytes, byte[] searchBytes)
        {
            if (srcBytes == null) { return -1; }
            if (searchBytes == null) { return -1; }
            if (srcBytes.Length == 0) { return -1; }
            if (searchBytes.Length == 0) { return -1; }
            if (srcBytes.Length < searchBytes.Length) { return -1; }
            for (int i = 0; i < srcBytes.Length - searchBytes.Length; i++)
            {
                if (srcBytes[i] == searchBytes[0])
                {
                    if (searchBytes.Length == 1) { return i; }
                    bool flag = true;
                    for (int j = 1; j < searchBytes.Length; j++)
                    {
                        if (srcBytes[i + j] != searchBytes[j])
                        {
                            flag = false;
                            break;
                        }
                    }
                    if (flag) { return i; }
                }
            }
            return -1;
        }

Usage example:

receiveData = new byte[1024];
int receiveLen = socket.ReceiveFrom(receiveData, ref ep);
receiveData = this.SubByte(receiveData, 0, receiveLen);
 if (this.IndexOf(receiveData, System.Text.Encoding.Unicode.GetBytes("Exec_Exit")) != -1)
{
    this.runing = false;
    break;
 }

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