[你必须知道的.NET] 第五回：深入浅出关键字---把new说透

new作为运算符
using System;

namespace Anytao.net.My_Must_net
{
    class MyClass
    {
        private int _id;

        public MyClass(int id)
        {
            _id = id;
        }
    }

    struct MyStruct
    {
        private string _name;

        public MyStruct(string name)
        {
            _name = name;
        }
    }

    class NewReflecting
    {
        public static void Main(string[] args)
        {
            int i;
            int j = new int();
            MyClass mClass = new MyClass(123);
            MyStruct mStruct = new MyStruct("My Struct");
        }
    }
}

IL元数据分析
.method public hidebysig static void Main(string[] args) cil managed
{
    .entrypoint
    .maxstack 2
    .locals init (
        [0] int32 num,
        [1] int32 num2,
        [2] class Anytao.net.My_Must_net._05_new.MyClass class2,
        [3] valuetype Anytao.net.My_Must_net._05_new.MyStruct struct2)
    L_0000: nop 
    
    //初始化j为0
    L_0001: ldc.i4.0 
    L_0002: stloc.1 
    
    //使用newobj指令创建新的对象，并调用构造函数以0x76（123的16进制）初始化
    L_0003: ldc.i4.s 0x7b    
    L_0005: newobj instance void Anytao.net.My_Must_net._05_new.MyClass::.ctor(int32)
    L_000a: stloc.2 
    //加载“My Struct”
    L_000b: ldloca.s struct2
    L_000d: ldstr "My Struct"
    //调用构造函数执行初始化
    L_0012: call instance void Anytao.net.My_Must_net._05_new.MyStruct::.ctor(string)
    L_0017: nop 
    L_0018: ret 
}

string str = new string('*', 100);

string str = new string(new char[] {'a', 'b', 'c'});

string str = "***************************************";