SecsValueLength 属性

字节长度信息，如果是 List 类型的话，就是数组长度，如果如 ASCII 类型，就是字符串的字节长度，其他类型都是表示数据个数
Byte length information, if it is of type List, it is the length of the array, if it is of type ASCII, it is the byte length of the string, other types are the number of data

public int Length { get; }

Public ReadOnly Property Length As Integer
	Get

public:
property int Length {
	int get ();
}

member Length : int with get