我编写了一个程序，允许两个班级“战斗".无论出于何种原因，C# 总是获胜.VB.NET 有什么问题?

问题描述

我写了一个程序，允许两个班级战斗".无论出于何种原因，C# 总是获胜.VB.NET 有什么问题?

I wrote a program that allow two classes to "fight". For whatever reason C# always wins. What's wrong with VB.NET ?

   static void Main(string[] args)
    {
        Player a = new A();
        Player b = new B();

        if (a.Power > b.Power)
            Console.WriteLine("C# won");
        else if (a.Power < b.Power)
            Console.WriteLine("VB won");
        else
            Console.WriteLine("Tie");
    }

以下是选手:C# 中的玩家 A:

Here are the players: Player A in C#:

public class A : Player
{
    private int desiredPower = 100;

    public override int GetPower
    {
        get { return desiredPower; }
    }
}

VB.NET 中的玩家 B:

Player B in VB.NET:

Public Class B
   Inherits Player

   Dim desiredPower As Integer = 100

   Public Overrides ReadOnly Property GetPower() As Integer
       Get
          Return desiredPower
       End Get
   End Property
 End Class

这是一个基类.

public abstract class Player
{
    public int Power { get; private set; }

    public abstract int GetPower { get; }

    protected Player()
    {
        Power = GetPower;
    }
}

推荐答案

这里的问题是 VB 在设置其字段值之前调用基本构造函数.所以基类 Player 存储零.

The issue here is that VB is calling the base constructor before setting its field value. So the base Player class stores zero.

.method public specialname rtspecialname 
        instance void  .ctor() cil managed
{
  // Code size       15 (0xf)
  .maxstack  8
  IL_0000:  ldarg.0
  IL_0001:  call       instance void [base]Player::.ctor()
  IL_0006:  ldarg.0
  IL_0007:  ldc.i4.s   100
  IL_0009:  stfld      int32 B::desiredPower
  IL_000e:  ret
} // end of method B::.ctor

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