使用反射获取属性引用

Question

var a = new obj();
var property = a.GetType().GetProperty("DB").GetValue(a,null) as testObject;

does this mean that the variable property hold a reference to the the same object that i got in object a , or a new testObject was made that holds the same values?

if this means creating a new object, then how can i get the reference to that property/backing field using reflection?

Answer 1

property now holds a referece to whatever is in a 's DB property.

I'm not sure though what happens when you call GetValue() on a property that has a value type, I suppose you get a reference to a boxed copy of the original value, as explained in Boxing and Unboxing (C# Programming Guide) :

Boxing a value type [to object in GetValue() 's case] allocates an object instance on the heap and copies the value into the new object.

Answer 2

这意味着一个属性的值DB你的对象的a投，以testType （你传递一个参考对象a在PropertyInfo.GetValue ），所以只有一个对象a和你的变量引用它的DB性能。

Answer 3

Variable property holds reference to same value stored in property DB .

GetValue(a,null) return type is object so with as operator you are simple type casting it.