Microsoft should have implemented something snappy for INotifyPropertyChanged , like in the automatic properties, just specify {get; set; notify;} {get; set; notify;} {get; set; notify;} I think it makes a lot of sense to do it. Or are there any complications to do it? Can we ourselves implement something like 'notify' in our properties. Is there a graceful solution for implementing
微软应该为INotifyPropertyChanged实现一些动作,就像在自动属性中一样,只需指定{get; set; notify;} {get; set; notify;} {get; set; notify;}我认为这样做很有意义。 或者有什么并发症可以做到吗? 我们是否可以在我们的房产中实施类似“通知”的内容? 是否有在您的类中实现INotifyPropertyChanged的优雅解决方案,或者唯一的方法是通过在每个属性中引发PropertyChanged事件。 如果没有,我们可以写一些东西来自动生成
This question already has an answer here: What is the difference between a definition and a declaration? 25 answers How do I use extern to share variables between source files? 15 answers extern int i ...is a variable declaration, since it only tells the compiler "there exists a variable called i , but it's defined somewhere else". int i ...is a variable definition, since
这个问题在这里已经有了答案: 定义和声明有什么区别? 25个答案 如何使用extern在源文件之间共享变量? 15个答案 extern int i ...是一个变量声明,因为它只告诉编译器“存在一个名为i的变量,但它定义在其他地方”。 int i ...是一个变量定义,因为它告诉编译器创建实际变量。 关键字extern用于声明外部变量,因此该书是正确的。 有一个例外,如果添加了一个初始化程序,那么这是一个定义: extern int i = 42;
This question already has an answer here: What is the difference between a definition and a declaration? 25 answers The variable a is declared and defined as a global variable in the line: int a = 20; The extern line just tells the main() function scope that a is defined in another place. In this case, the use of extern is not really necessary. You could just declare and define a before
这个问题在这里已经有了答案: 定义和声明有什么区别? 25个答案 变量a被声明并定义为行中的全局变量 : int a = 20; extern行只是告诉main()函数的作用域, a是在另一个地方定义的。 在这种情况下,使用extern并不是真的必要。 您可以在main()函数之前声明并定义a ,然后main()会熟悉它。 通常,当你想使用在另一个源文件中定义的变量或函数时(而不仅仅是在相同的源文件中),你可以使用extern 。 extern在语法
Possible Duplicate: What is the difference between a definition and a declaration? I am confuse about the function declare on head file. does this is same as java, declare function on one file,in that that file has function also has method. does in C, make the function and method in two different files? here is a example: song.h typedef struct { int lengthInSeconds; int yearRecor
可能重复: 定义和声明有什么区别? 我对头文件中声明的函数感到困惑。 这与java一样,在一个文件上声明函数,该文件中有函数也有方法。 在C中做,在两个不同的文件中做功能和方法? 这里是一个例子: song.h typedef struct { int lengthInSeconds; int yearRecorded; } Song; Song make_song (int seconds, int year); void display_song (Song theSong); song.c #include <stdio.h> #incl
This question already has an answer here: What is the difference between a definition and a declaration? 25 answers It's a declaration. It declares the type struct foo . (C99, 6.7p5) "A declaration specifies the interpretation and attributes of a set of identifiers. A definition of an identifier is a declaration for that identifier that: — for an object, causes storage to be re
这个问题在这里已经有了答案: 定义和声明有什么区别? 25个答案 这是一个声明。 它声明了struct foo类型。 (C99,6.7p5)“声明指定了一组标识符的解释和属性,标识符的定义是对该标识符的声明: - 对于一个对象,导致为该对象保留存储空间; - 对于功能,包括功能体; 101) - 对于枚举常量或typedef名称,是标识符的(唯一)声明。“ 你的理解是正确的。 你的代码示例是一个类型的声明。 在'C'中,
This question already has an answer here: What is the difference between a definition and a declaration? 25 answers Does the compiler set aside memory for the declared (but not defined) variables? No, compiler just take a note of this variable name and type. No memory is allocated for declaration. int i; can behave as definition if i is used (not optimized out) and no other definition o
这个问题在这里已经有了答案: 定义和声明有什么区别? 25个答案 编译器是否为已声明(但未定义)的变量留出内存? 不,编译器只是记下这个变量的名称和类型。 没有内存分配给声明。 int i; 可以像使用i (未优化)那样表现为定义,并且在其他编译单元中不存在其他i定义,并且将为其保留存储空间。 (因为存储是为定义保留的) 定义是何时为变量分配存储空间。 声明并不意味着存储已分配。 声明用于访问在不同源
I have a ip check in my source use csharp. And now, I must to think about the check rule about the ipv4 and ipv6. The client side maybe like ↓ ・only ipv4 ・only ipv6 ・both ipv4 and ipv6 Im sorry , Im new to the networking . As so , Is anybody could give me some suggestion about the ip check? Thanks. About the IP Check: I have a check like ↓ now : bool isgoodip() { return ip.
我有一个在我的源使用csharp的IP检查。 而现在,我必须考虑有关ipv4和ipv6的检查规则。 客户端可能像↓ ・only ipv4 ・only ipv6 ・both ipv4 and ipv6 很抱歉,我是网络新手。 因此,有人可以给我一些关于IP检查的建议吗? 谢谢。 关于IP检查: 我现在有一个像↓的检查: bool isgoodip() { return ip.startwith(173); } 如果客户端只有ipv6,我该如何做这样的检查? 并且,是否有服务器设置可以将ipv6转
I have some classes that contain several fields. I need to compare them by value, ie two instances of a class are equal if their fields contain the same data. I have overridden the GetHashCode and Equals methods for that. It can happen that these classes contain circular references. Example: We want to model institutions (like government, sports clubs, whatever). An institution has a name.
我有一些包含几个字段的类。 我需要通过值来比较它们,例如,如果一个类的两个实例的字段包含相同的数据,则它们是相等的。 我已经重写了GetHashCode和Equals方法。 可能会发生这些类包含循环引用。 例如:我们想建立机构模型(如政府,体育俱乐部等)。 一个机构有一个名字。 Club是一个有名字和成员名单的机构。 每个成员都是一个Person ,有一个名字和一个喜欢的机构。 如果某个俱乐部的成员将该俱乐部作为他最喜欢
Some programs (image programs such as Paint, text editors such as notepad and Wordpad,and others) open files, load the contents into memory, then release the file lock. Is there a way to tell if a program is using that file even though it's not locked? For example, even if image1.bmp is open in Paint, my program can overwrite the copy of image1.bmp that's on the disk because the file i
某些程序(图像程序,如Paint,文本编辑器(如记事本和写字板等))打开文件,将内容加载到内存中,然后释放文件锁定。 有没有办法判断一个程序是否在使用该文件,即使它没有被锁定? 例如,即使在Paint中打开image1.bmp,我的程序也可以覆盖磁盘上image1.bmp的副本,因为该文件未被锁定。 现在,在Paint中打开的image1.bmp的副本与磁盘上的image1.bmp的副本不同。 我的程序是用C#编写的。 我通常使用这种方法来检查文件
I am displaying a Image in a Xamarin.Forms UWP app, the image resides in the LocalState folder of the app and the image source is set during runtime. As soon as the image is displayed, the underlying file is opened and can therefore not be renamed in eg the Windows Explorer. But even when I navigate away from the page displaying the image or set the source of the image to null or a different
我在Xamarin.Forms UWP应用程序中显示图像,图像驻留在应用程序的LocalState文件夹中,图像源在运行时设置。 只要显示图像,底层文件就会打开,因此不能在Windows资源管理器中重命名。 但即使当我离开显示图像的页面时,或者将图像的源设置为null或不同的图像时,该文件仍然会打开并且无法重命名,直到关闭UWP应用程序。 Android或iOS上不会发生此行为。 如何释放图像显示的文件? 图像的XAML标签: <Image x:Name="