base-class

问题 The issue I am having is with a dropped item i pick up adding ammo to a gun. Built a Gun class with all the methods and variables. Built a Rifle class derived from the Gun class The Rifle works perfect No Issues I now am adding a "PickUp" system where x amount of enemies drop a pickup. This is the script on the item to pick up public class AddARAmmo : MonoBehaviour { private Rifle rifle; private void Awake() { rifle = FindObjectOfType<Rifle>(); } private void OnTriggerEnter(Collider other) {

问题 I don't know if this is possible, but I am trying to get the Base Class instance from a Derived Class. In C#, I can use the base keyword to access properties and methods of the Base Class (of course), but I want to use base itself. Attempting to do so results in a "Use of keyword 'base' is not valid in this context" error. Example Code public class SuperParent { public int SPID; public SuperParent() { } } public class SubChild : SuperParent { public SubChild(int pSPID) { base.SPID = pSPID; }

问题 I don't know if this is possible, but I am trying to get the Base Class instance from a Derived Class. In C#, I can use the base keyword to access properties and methods of the Base Class (of course), but I want to use base itself. Attempting to do so results in a "Use of keyword 'base' is not valid in this context" error. Example Code public class SuperParent { public int SPID; public SuperParent() { } } public class SubChild : SuperParent { public SubChild(int pSPID) { base.SPID = pSPID; }

问题 I have a DbContext with set up different DbSet<T> s with all types that derive from the same base class: public class Foo : Entity { } public class Bar : Entity { } MyDbContext : DbContext { public DbSet<Foo> Foos { get; set; } public DbSet<Bar> Bars { get; set; } } Is it possible to get all entities which have the Entity base class in one query, like: DbContext.Set<Entity>(); // doesn't work I tried to introduce an explicit DbSet<Entity> to the DbContext, but that results in one big table

问题 I have the following base class: class NeuralNetworkBase: def __init__(self, numberOfInputs, numberOfHiddenNeurons, numberOfOutputs): self.inputLayer = numpy.zeros(shape = (numberOfInputs)) self.hiddenLayer = numpy.zeros(shape = (numberOfHiddenNeurons)) self.outputLayer = numpy.zeros(shape = (numberOfOutputs)) self.hiddenLayerWeights = numpy.zeros(shape = (numberOfInputs, numberOfHiddenNeurons)) self.outputLayerWeights = numpy.zeros(shape = (numberOfHiddenNeurons, numberOfOutputs)) now, I

问题 struct B { int b1, b2; B(int, int); }; struct D : B { int d1, d2; // which is technically better ? D (int i, int j, int k, int l) : B(i,j), d1(k), d2(l) {} // 1st Base // or D (int i, int j, int k, int l) : d1(k), d2(l), B(i,j) {} // last Base }; Above is just pseudo code. In actual I wanted to know that does the order of calling base constructor matter ? Are there any bad behaviors (especially corner cases ) caused by any of the cases ? My question is on more technical aspect and not on

问题 I've some classes A, B, C they all inherit from class BaseClass. I've a String json that contains the json representation of the A, B, C or BaseClass. I want to have some way to deserialize this String to the BaseClass (polymorphic deserialization). Something like this BaseClass base = ObjectMapper.readValue(jsonString, BaseClass.class); jsonString could be Json String representation of any of A, B, C, or BaseClass. 回答1: It's not clear what problem the original poster is having. I'm guessing

问题 I am now working on an imprived version of merge sort. I implemented it with C++ and C#. Then compared them with the stl sort and array.sort() algorithm respectively. In C++ I have got an equal (sometimes better) result. But in C#, I had to use unsafe code for using pointers. Here the performence is not that much comparable with default sort. So, I want to know- 1. Which algorithms are used in stl and .net base class library?(Better with links) 2. Do unsafe codes has performence issues? 3.

问题 I would like to instantiate an instance of a class based on the type of another instance that is part of a simple type hierarchy. public abstract class Base { } public class Derived1 : Base { } public class Derived2 : Base { } This is easy to do with the following code Base d1 = new Derived1(); Base d2; if (d1 is Derived1) { d2 = new Derived1(); } else if (d1 is Derived2) { d2 = new Derived2(); } However, is it possible to achieve this without an if...else if... chain by (for example) using

问题 I saw this question in one of my question papers: Why should the derived class constructor always access base class constructor? I'm wondering whether the question is valid? 回答1: So that you may have a valid object of type "Base" before you start messing with the inherited functionality in your derived object! 回答2: It's not valid. There's no 'should' about it: it must , and the compiler enforces it, by calling the base class's default constructor if it exists, and giving you a compile error