摘要： StringString 是不可变的(immutable), 一旦建立，不能改变。字符串池CLR初始化时会创建一个内部的HASH TABLE，key是字符串，value是对托管堆上的字符串对象的引用。但是当显式的New一个字符串对象时，字符串池不起作用。System.Runtime.CompilerServices.CompilationRelaxationAttribute特性来开关字符串池ComplitationRelaxations.NoStringInterningSecureString命名空间System.SecuritySecureString的由来SecureString是用来 阅读全文

摘要： MetaDataMetadata is aset of data tables that describe what is defined in the module, such as types and their members.MetaData also has tables indicating what the managed module references, such as imported types and their members.Assembly?An assembly is a logical grouping of one or more modules or r 阅读全文

摘要： 面向对象的基本原则一。Encapsulate things in your design that are likely to change（封装变化） We isolate the parts that will change a lot into a sparate class or classes that we can depend on changing, and we increase our flexibility and ease of change. We also leave the stable part of our design alone, so that we . 阅读全文

摘要： DependencyProperty 依赖属性 阅读全文

摘要： 云台：安装，固定摄像机的支撑设备，分为固定和电动两种。摄像头：分为数字摄像头和模拟摄像头。数字摄像头是将视频采集设备采集的模拟视频信号转换成数字信号，进而将其存储在计算机里。可以直接捕捉影像，然后通过串，并口或者 USB接口传到计算机里。 模拟摄像头捕捉的视频信号必须通过特定的视频捕捉卡将模拟信号转换成数字模式并加以压缩才能传到计算机上。 阅读全文