Ref Class vs Ref Struct，有什么区别？

Question

public struct StructHouse{
public int number;
}


public class ClassHouse{
public int number;
}


public class Test{
public TestForStruct testForStruct;
public ClassHouse classHouse = new ClassHouse();
public StructHouse structHouse = new StructHouse();

SendRef1(ref classHouse);
testForStruct.SendRef2(ref structHouse);
}

public class TestForStruct{
public StructHouse structHouse;

public void (ref classHouse);
public void SendRef2(ref StructHouse structHouse){
this.structHouse = structHouse;
this.structHouse.number = 1;      //THIS DOESN'T UPDATE THE VALUE FOR 'Test'
//BUT IT DOES UPDATE IF I SEND REF CLASS INSTEAD OF REF STRUCT
}

e: if I change the reference value for 'number' in 'SendRef1', the value is updated in the class Test, but it's not updated when changing the value in SendRef2. Can anyone please explain this?

Thanks in advance.

Answer 1

This line is copying the struct.

this.structHouse = structHouse;

You change the value of number only on the copy.