How Yield works within a foreach loop shown below? lstNumbers is of type List<int> . foreach (int i in lstNumbers) { yield return i; } Will it start returning as it receives the value or it returns the final list at the end? How is it different from: foreach (int i in lstNumbers) { return i; } In this example it will return all the values, one by one, but the c
如何在下面显示的foreach循环中使用Yield？ lstNumbers的类型是List<int> 。 foreach (int i in lstNumbers) { yield return i; } 它会在收到值时开始返回，还是会在最后返回最终列表？ 它与以下不同： foreach (int i in lstNumbers) { return i; } 在这个例子中，它将逐个返回所有的值，但是消费代码需要开始迭代结果集： foreach (int i in lstNumbers) { yield return i; } 看看
I'm trying to understand the use of the yield keyword in C#, as a queue modelling package I'm using makes extensive use of it. To demonstrate the use of yield, I am playing around with the following code: using System; using System.Collections.Generic; public class YieldTest { static void Main() { foreach (int value in ComputePower(2, 5)) { Console.W
我试图理解C＃中yield关键字的用法，因为我使用的队列建模软件包广泛使用它。 为了演示yield的使用，我正在玩弄以下代码： using System; using System.Collections.Generic; public class YieldTest { static void Main() { foreach (int value in ComputePower(2, 5)) { Console.Write(value); Console.Write(" "); } Console.WriteLine(); } /**
What would the MSDN sample look like without the yield keyword? You may use any example if you perfer. I would just like to understand what is going on under the hood. Is the yield operator eagerly or lazily evaluated? Sample: using System; using System.Collections; public class List { public static IEnumerable Power(int number, int exponent) { int counter = 0; int
如果没有yield关键字，MSDN示例将会是什么样子？ 如果你喜欢，你可以使用任何示例。 我只想了解发生了什么。 对收益运营商进行热切或懒惰的评估？ 样品： using System; using System.Collections; public class List { public static IEnumerable Power(int number, int exponent) { int counter = 0; int result = 1; while (counter++ < exponent) { result =
This question already has an answer here: What is the difference between an interface and abstract class? 32 answers Let's say the third party class, already inherits from a class(could be a class or abstract class). Now if you want your third party class to make use of this new abstract class, new set of classes have to be written. c# doesn't support inheritance of multiple classe
这个问题在这里已经有了答案： 界面和抽象类有什么区别？ 32个答案 假设第三方类已经从类继承（可以是类或抽象类）。 现在如果你想让你的第三方类使用这个新的抽象类，就必须编写一套新的类。 c＃不支持多个类的继承。 但是在接口的情况下，你现有的第三方类可能只是实现它，即实现它的方法。
This question already has an answer here: What is the difference between an interface and abstract class? 32 answers You need explicit implementation of interface. The abstract class method method() implementation fulfill the need of implementation of abstract method of interface. So define the method of interface in the class childe but explicit implementation need to call the method of i
这个问题在这里已经有了答案： 界面和抽象类有什么区别？ 32个答案 你需要明确的实现接口。 抽象类方法method()实现满足了接口抽象方法实现的需要。 因此，在类childe定义接口的方法，但显式实现需要调用接口的方法，但不要调用类。 public interface NomiInterface { void method(); } public abstract class Nomi1 { public void method() { Console.WriteLine("abstract class method");
This question already has an answer here: What is the difference between an interface and abstract class? 32 answers An interface is a contract: it specifies what members (methods and properties) a class implementing the interface must have. But because it is only a contract, it has no implementations for any of its members. A class can implement zero, one or multiple interfaces. In cont
这个问题在这里已经有了答案： 界面和抽象类有什么区别？ 32个答案 接口是一个契约：它指定实现接口的类必须具有哪些成员（方法和属性）。 但是因为它只是一个合约，它没有任何成员的实现。 一个类可以实现零个，一个或多个接口。 相比之下：一个类是一个......好的......类的对象（如分类法）。 例如， Animal是一类生物，而Giraffe则是一类动物。 继承表示这种关系：一个Giraffe是Animal当Giraffe从继承Animal 。
This question already has an answer here: Interface or abstract class? 15 answers There are technical differences between Abstract Classes and Interfaces, that being an Abstract Class can contain implementation of methods, fields, constructors, etc, while an Interface only contains method and property prototypes. A class can implement multiple interfaces, but it can only inherit one class (
这个问题在这里已经有了答案： 界面还是抽象类？ 15个答案 抽象类和接口之间存在技术差异，作为抽象类可以包含方法，字段，构造函数等的实现，而接口只包含方法和属性原型。 一个类可以实现多个接口，但它只能继承一个类（抽象或其他）。 但是，在我看来，接口和抽象类最重要的区别是语义上的差异。 一个接口定义了什么可以做（它的行为），一个抽象类定义了什么是。 以IEnumerable为例，其背后的语义意义是任何实现
(NOTE: Dictionary where T is some ProtoContract / ProtoMembered class works fine. ) This issue only happened for me with type object. I was trying to serialize a dictionary of Dictionary working. typeof(object) doesn't work. Should it? Should I implement a string based work around? In this scenario, object will only ever be a .net primitive. [Test] public void De_SerializeObj
（注：T是一些ProtoContract / ProtoMembered类的字典工作正常。）这个问题只发生在我用类型对象。 我试图序列化字典工作的字典。 typeof（对象）不起作用。 应该是？ 我应该实施一个基于字符串的工作吗？ 在这种情况下，对象将永远只是一个.net原语。 [Test] public void De_SerializeObjectDictionary2() { var d = new Dictionary<string, object>(); d.Add("abc", 12);
I have a function called "CreateCriteriaExpression" that takes a json string and creates a linq expression from it. This method is called by another called "GetByCriteria", which calls the "CreateCriteriaExpression" method and then executes that expression against an entity framework context. For all of my entity framework objects, the "GetByCriteria" m
我有一个名为“CreateCriteriaExpression”的函数，它接受一个json字符串并从中创建一个linq表达式。 此方法由另一个名为“GetByCriteria”的方法调用，该方法调用“CreateCriteriaExpression”方法，然后针对实体框架上下文执行该表达式。 对于我所有的实体框架对象，除了它的类型之外，“GetByCriteria”方法是相同的。 所以我试图将其转换为使用泛型而不是硬编码类型。 当“GetByCriteria”方法达到它必须调用“CreateCriteriaExp
I'm using the standard .NET authentication database tables and code, with .NET 4.0, C# and MVC 3. Basically, I want to have roles (which are included in the framework), and then be able to assign permissions to those roles (which are not included, as far as I know). So I want to assign permissions to roles. A user in the Accountant role couldn't edit and delete employees, but a user
我使用标准的.NET身份验证数据库表和代码，.NET 4.0，C＃和MVC 3。 基本上，我想要角色（包含在框架中），然后能够为这些角色分配权限（据我所知，这些角色不包括在内）。 所以我想给角色分配权限。 会计角色中的用户无法编辑和删除员工，但具有管理员角色的用户可以。 由于这些权限可能会随时更改，而不是检查User.IsInRole("Administrator") ，所以我想要执行类似User.HasPermission("EditEmployee"