为什么反射在一个Struct中设置一个属性？ [英] Why doesn't reflection set a property in a Struct?

问题描述

   class PriceClass {

        private int value;
        public int Value
        {
            get { return this.value; }
            set { this.value = value; }
        }           
    }


    struct PriceStruct
    {

        private int value;
        public int Value
        {
            get { return this.value; }
            set { this.value = value; }
        }
    }
    static void Main(string[] args)
    {
        PriceClass _priceClass = new PriceClass();
        Type type = typeof(PriceClass);
        PropertyInfo info = type.GetProperty("Value");
        info.SetValue(_priceClass, 32, null);
        Console.WriteLine(_priceClass.Value);

        PriceStruct _priceStruct = new PriceStruct();
        type = typeof(PriceStruct);
        info = type.GetProperty("Value");
        info.SetValue(_priceStruct, 32, null);
        Console.WriteLine(_priceStruct.Value);

        Debugger.Break();
    }

打印的第一个值为32而第二个值为0.没有异常抛出

The first value printed is 32 while the second is 0. No exception thrown

推荐答案

这是因为你的结构体是一个副本，所以你应该把它早些时候，所以你从相同的数据调用getter你修改。以下代码适用：

It's because boxing your struct makes a copy of it, so you should box it earlier so you call the getter from the same data that you modified. The following code works:

    object _priceStruct = new PriceStruct(); //Box first
    type = typeof(PriceStruct);
    info = type.GetProperty("Value");
    info.SetValue(_priceStruct, 32, null);
    Console.WriteLine(((PriceStruct)_priceStruct).Value); //now unbox and get value

    Debugger.Break();

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