C#二进制字节流查找函数IndexOf的示例代码详解

/// <summary>

/// 报告指定的 System.Byte[] 在此实例中的第一个匹配项的索引。

/// </summary>

/// <param name="srcBytes">被执行查找的 System.Byte[]。</param>

/// <param name="searchBytes">要查找的 System.Byte[]。</param>

/// <returns>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。</returns>

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;

}

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;

 }