.NET中的结构和类有什么区别?
当前回答
除了其他答案中描述的所有差异外:
结构不能具有显式无参数构造函数,而类可以结构不能有析构函数,而类可以结构不能从其他结构或类继承,而类可以从其他类继承。(结构和类都可以从接口实现。)
如果您正在观看一段视频,解释所有的差异,您可以查看第29部分-C#教程-C#中类和结构之间的差异。
其他回答
首先,结构是通过值而不是引用传递的。结构适用于相对简单的数据结构,而类通过多态性和继承从体系结构的角度来看具有更大的灵活性。
其他人可能会比我给你更多的细节,但当我所追求的结构很简单时,我会使用结构。
结构与等级
结构是一种值类型,因此它存储在堆栈上,但类是一种引用类型,存储在堆上。
结构不支持继承和多态,但类同时支持两者。
默认情况下,所有结构成员都是公共的,但类成员在本质上默认是私有的。
由于结构是一种值类型,我们不能将null赋给结构对象,但类的情况并非如此。
除了访问说明符的基本区别,以及上面提到的几个区别之外,我还想添加一些主要区别,包括上面提到的一些区别,以及带有输出的代码示例,这将提供对引用和值的更清晰的了解
结构:
是值类型,不需要堆分配。内存分配不同,存储在堆栈中适用于小型数据结构影响性能,当我们将值传递给方法时,我们会传递整个数据结构,所有数据都传递给堆栈。构造函数只返回结构值本身(通常在堆栈上的临时位置),然后根据需要复制该值每个变量都有自己的数据副本,其中一个变量的操作不可能影响另一个变量。不支持用户指定的继承,它们隐式继承自类型对象
类别:
参考类型值存储在堆中存储对动态分配对象的引用构造函数是用new运算符调用的,但它不会在堆上分配内存多个变量可以引用同一对象对一个变量的操作可能会影响另一个变量引用的对象
代码示例
static void Main(string[] args)
{
//Struct
myStruct objStruct = new myStruct();
objStruct.x = 10;
Console.WriteLine("Initial value of Struct Object is: " + objStruct.x);
Console.WriteLine();
methodStruct(objStruct);
Console.WriteLine();
Console.WriteLine("After Method call value of Struct Object is: " + objStruct.x);
Console.WriteLine();
//Class
myClass objClass = new myClass(10);
Console.WriteLine("Initial value of Class Object is: " + objClass.x);
Console.WriteLine();
methodClass(objClass);
Console.WriteLine();
Console.WriteLine("After Method call value of Class Object is: " + objClass.x);
Console.Read();
}
static void methodStruct(myStruct newStruct)
{
newStruct.x = 20;
Console.WriteLine("Inside Struct Method");
Console.WriteLine("Inside Method value of Struct Object is: " + newStruct.x);
}
static void methodClass(myClass newClass)
{
newClass.x = 20;
Console.WriteLine("Inside Class Method");
Console.WriteLine("Inside Method value of Class Object is: " + newClass.x);
}
public struct myStruct
{
public int x;
public myStruct(int xCons)
{
this.x = xCons;
}
}
public class myClass
{
public int x;
public myClass(int xCons)
{
this.x = xCons;
}
}
输出
Struct Object的初始值为:10
内部结构方法Struct对象的内部方法值为:20
结构对象的方法调用值为:10
类对象的初始值为:10
内部类方法类对象的内部方法值为:20
类对象的方法调用值为:20
在这里,您可以清楚地看到按值调用和按引用调用之间的区别。
Struct | Class | |
---|---|---|
Type | Value-type | Reference-type |
Where | On stack / Inline in containing type | On Heap |
Deallocation | Stack unwinds / containing type gets deallocated | Garbage Collected |
Arrays | Inline, elements are the actual instances of the value type | Out of line, elements are just references to instances of the reference type residing on the heap |
Al-Del Cost | Cheap allocation-deallocation | Expensive allocation-deallocation |
Memory usage | Boxed when cast to a reference type or one of the interfaces they implement, Unboxed when cast back to value type (Negative impact because boxes are objects that are allocated on the heap and are garbage-collected) |
No boxing-unboxing |
Assignments | Copy entire data | Copy the reference |
Change to an instance | Does not affect any of its copies | Affect all references pointing to the instance |
Mutability | Should be immutable | Mutable |
Population | In some situations | Majority of types in a framework should be classes |
Lifetime | Short-lived | Long-lived |
Destructor | Cannot have | Can have |
Inheritance | Only from an interface | Full support |
Polymorphism | No | Yes |
Sealed | Yes | When have sealed keyword (C#), or Sealed attribute (F#) |
Constructor | Can not have explicit parameterless constructors | Any constructor |
Null-assignments | When marked with nullable question mark | Yes (When marked with nullable question mark in C# 8+ and F# 5+ 1) |
Abstract | No | When have abstract keyword (C#), or AbstractClass attribute (F#) |
Member Access Modifiers | public , private , internal |
public , protected , internal , protected internal , private protected |
1不鼓励在F#中使用null,请改用Option类型。
有一个有趣的“类vs结构”难题案例——当您需要从方法返回几个结果时:选择要使用的结果。如果你知道ValueTuple的故事,你就知道添加ValueTuple(结构)是因为它应该比Tuple(类)更有效。但这在数字上意味着什么?两个测试:一个是具有2个字段的结构/类,另一个是有8个字段的类型/类(维度大于4-从处理器节拍的角度来看,类应该比结构更有效,但当然也应该考虑GC负载)。
P.S.另一个特定案例“stuct or class with collections”的基准是:https://stackoverflow.com/a/45276657/506147
BenchmarkDotNet=v0.10.10, OS=Windows 10 Redstone 2 [1703, Creators Update] (10.0.15063.726)
Processor=Intel Core i5-2500K CPU 3.30GHz (Sandy Bridge), ProcessorCount=4
Frequency=3233540 Hz, Resolution=309.2586 ns, Timer=TSC
.NET Core SDK=2.0.3
[Host] : .NET Core 2.0.3 (Framework 4.6.25815.02), 64bit RyuJIT
Clr : .NET Framework 4.7 (CLR 4.0.30319.42000), 64bit RyuJIT-v4.7.2115.0
Core : .NET Core 2.0.3 (Framework 4.6.25815.02), 64bit RyuJIT
Method | Job | Runtime | Mean | Error | StdDev | Min | Max | Median | Rank | Gen 0 | Allocated |
------------------ |----- |-------- |---------:|----------:|----------:|---------:|---------:|---------:|-----:|-------:|----------:|
TestStructReturn | Clr | Clr | 17.57 ns | 0.1960 ns | 0.1834 ns | 17.25 ns | 17.89 ns | 17.55 ns | 4 | 0.0127 | 40 B |
TestClassReturn | Clr | Clr | 21.93 ns | 0.4554 ns | 0.5244 ns | 21.17 ns | 23.26 ns | 21.86 ns | 5 | 0.0229 | 72 B |
TestStructReturn8 | Clr | Clr | 38.99 ns | 0.8302 ns | 1.4097 ns | 37.36 ns | 42.35 ns | 38.50 ns | 8 | 0.0127 | 40 B |
TestClassReturn8 | Clr | Clr | 23.69 ns | 0.5373 ns | 0.6987 ns | 22.70 ns | 25.24 ns | 23.37 ns | 6 | 0.0305 | 96 B |
TestStructReturn | Core | Core | 12.28 ns | 0.1882 ns | 0.1760 ns | 11.92 ns | 12.57 ns | 12.30 ns | 1 | 0.0127 | 40 B |
TestClassReturn | Core | Core | 15.33 ns | 0.4343 ns | 0.4063 ns | 14.83 ns | 16.44 ns | 15.31 ns | 2 | 0.0229 | 72 B |
TestStructReturn8 | Core | Core | 34.11 ns | 0.7089 ns | 1.4954 ns | 31.52 ns | 36.81 ns | 34.03 ns | 7 | 0.0127 | 40 B |
TestClassReturn8 | Core | Core | 17.04 ns | 0.2299 ns | 0.2150 ns | 16.68 ns | 17.41 ns | 16.98 ns | 3 | 0.0305 | 96 B |
代码测试:
using System;
using System.Text;
using System.Collections.Generic;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Attributes.Columns;
using BenchmarkDotNet.Attributes.Exporters;
using BenchmarkDotNet.Attributes.Jobs;
using DashboardCode.Routines.Json;
namespace Benchmark
{
//[Config(typeof(MyManualConfig))]
[RankColumn, MinColumn, MaxColumn, StdDevColumn, MedianColumn]
[ClrJob, CoreJob]
[HtmlExporter, MarkdownExporter]
[MemoryDiagnoser]
public class BenchmarkStructOrClass
{
static TestStruct testStruct = new TestStruct();
static TestClass testClass = new TestClass();
static TestStruct8 testStruct8 = new TestStruct8();
static TestClass8 testClass8 = new TestClass8();
[Benchmark]
public void TestStructReturn()
{
testStruct.TestMethod();
}
[Benchmark]
public void TestClassReturn()
{
testClass.TestMethod();
}
[Benchmark]
public void TestStructReturn8()
{
testStruct8.TestMethod();
}
[Benchmark]
public void TestClassReturn8()
{
testClass8.TestMethod();
}
public class TestStruct
{
public int Number = 5;
public struct StructType<T>
{
public T Instance;
public List<string> List;
}
public int TestMethod()
{
var s = Method1(1);
return s.Instance;
}
private StructType<int> Method1(int i)
{
return Method2(++i);
}
private StructType<int> Method2(int i)
{
return Method3(++i);
}
private StructType<int> Method3(int i)
{
return Method4(++i);
}
private StructType<int> Method4(int i)
{
var x = new StructType<int>();
x.List = new List<string>();
x.Instance = ++i;
return x;
}
}
public class TestClass
{
public int Number = 5;
public class ClassType<T>
{
public T Instance;
public List<string> List;
}
public int TestMethod()
{
var s = Method1(1);
return s.Instance;
}
private ClassType<int> Method1(int i)
{
return Method2(++i);
}
private ClassType<int> Method2(int i)
{
return Method3(++i);
}
private ClassType<int> Method3(int i)
{
return Method4(++i);
}
private ClassType<int> Method4(int i)
{
var x = new ClassType<int>();
x.List = new List<string>();
x.Instance = ++i;
return x;
}
}
public class TestStruct8
{
public int Number = 5;
public struct StructType<T>
{
public T Instance1;
public T Instance2;
public T Instance3;
public T Instance4;
public T Instance5;
public T Instance6;
public T Instance7;
public List<string> List;
}
public int TestMethod()
{
var s = Method1(1);
return s.Instance1;
}
private StructType<int> Method1(int i)
{
return Method2(++i);
}
private StructType<int> Method2(int i)
{
return Method3(++i);
}
private StructType<int> Method3(int i)
{
return Method4(++i);
}
private StructType<int> Method4(int i)
{
var x = new StructType<int>();
x.List = new List<string>();
x.Instance1 = ++i;
return x;
}
}
public class TestClass8
{
public int Number = 5;
public class ClassType<T>
{
public T Instance1;
public T Instance2;
public T Instance3;
public T Instance4;
public T Instance5;
public T Instance6;
public T Instance7;
public List<string> List;
}
public int TestMethod()
{
var s = Method1(1);
return s.Instance1;
}
private ClassType<int> Method1(int i)
{
return Method2(++i);
}
private ClassType<int> Method2(int i)
{
return Method3(++i);
}
private ClassType<int> Method3(int i)
{
return Method4(++i);
}
private ClassType<int> Method4(int i)
{
var x = new ClassType<int>();
x.List = new List<string>();
x.Instance1 = ++i;
return x;
}
}
}
}
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