c# - c# 编译器是否会执行多个隐式转换以从一种类型转换为另一种类型？

Question

假设您有一个如下所示的类:

public sealed class StringToInt { 
    private string _myString; 
    private StringToInt(string value) 
    { 
        _myString = value; 
    } public static implicit operator int(StringToInt obj) 
    { 
        return Convert.ToInt32(obj._myString); 
    } 
    public static implicit operator string(StringToInt obj) 
    { 
        return obj._myString; 
    } 
    public static implicit operator StringToInt(string obj) 
    { 
        return new StringToInt(obj); 
    } 
    public static implicit operator StringToInt(int obj) 
    { 
        return new StringToInt(obj.ToString()); 
    } 
}

你能不能写出如下代码:

MyClass.SomeMethodThatOnlyTakesAnInt(aString);

没有说明没有从字符串到 int 的隐式转换？

[是的，我可以自己测试，但我想我会把它放在那里，看看所有专家怎么说]

Answer 1

没有 C# 不会调用多个用户定义的隐式转换。来自 C# 规范第 6.4.3 节:

Evaluation of a user-defined conversion never involves more than one user-defined or lifted conversion operator. In other words, a conversion from type S to type T will never first execute a user-defined conversion from S to X and then execute a user-defined conversion from X to T.