用於截取字節數組SubByte的C#二進制字節數組操作函數

/// <summary>  
/// 截取字節數組  
/// </summary>  
/// <param name="srcBytes">要截取的字節數組</param>  
/// <param name="startIndex">開始截取位置的索引</param>  
/// <param name="length">要截取的字節長度</param>  
/// <returns>截取後的字節數組</returns>  
public byte[] SubByte(byte[] srcBytes, int startIndex, int length)  
{  
    System.IO.MemoryStream bufferStream = new System.IO.MemoryStream();  
    byte[] returnByte = new byte[] { };  
    if (srcBytes == null) { return returnByte; }  
    if (startIndex < 0) { startIndex = 0; }  
    if (startIndex < srcBytes.Length)  
    {  
        if (length < 1 || length > srcBytes.Length - startIndex) { length = srcBytes.Length - startIndex; }  
        bufferStream.Write(srcBytes, startIndex, length);  
        returnByte = bufferStream.ToArray();  
        bufferStream.SetLength(0);  
        bufferStream.Position = 0;  
    }  
    bufferStream.Close();  
    bufferStream.Dispose();  
    return returnByte;  
}

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