How are dictionary changes reflected in assignable ones?

Question

C++ / C#

let's take 3 dictionaries with the same structure as an example, 1 main one is filled, 2 and 3 are empty, then 2 and 3 are assigned to the 1st dictionary

private Dictionary<string, ClassTest> Dictionary1 = new Dictionary<string, ClassTest>();
private Dictionary<string, ClassTest> Dictionary2 = new Dictionary<string, ClassTest>();
private Dictionary<string, ClassTest> Dictionary3 = new Dictionary<string, ClassTest>();

//Dictionary1 -заполняем данными
Dictionary2 = Dictionary1;
Dictionary3 = Dictionary1;

as I understand it, if I change the values ​​​​in Dictionary1, then they will change in 2 and 3 dictionaries?
but if I change the values ​​in 2 and 3 dictionaries, they will not affect each other?
that is, changing the values ​​​​in the 2nd dictionary will not affect the 3rd dictionary in any way, do I understand correctly?

And it’s just that I recently encountered such a problem that I assigned one dictionary to another Dictionary2 = Dictionary1 then cleared the 1st one and the 2nd automaton also turned out to be cleared, so I’m clarifying ...

Answer 1

https://docs.microsoft.com/en-us/dotnet/csharp/lan...

as I understand it, if I change the values ​​​​in Dictionary1, then they will change in 2 and 3 dictionaries?

yes, since everyone will refer to the same object

but if I change the values ​​in 2 and 3 dictionaries, they will not affect each other?

will be, because they will refer to the same object

that is, changing the values ​​​​in the 2nd dictionary will not affect the 3rd dictionary in any way, do I understand correctly?

No

And it’s just that I recently encountered such a problem that I assigned one dictionary to another Dictionary2 = Dictionary1 then cleared the 1st and the 2nd automaton also turned out to be cleared

it's the same dictionary. it's just referenced by two variables.
those

private Dictionary<string, ClassTest> Dictionary1  // переменная Dictionary1 типа Dictionary<> 
    = new Dictionary<string, ClassTest>(); //которая ссылается на объект Dictionary [id=1]
private Dictionary<string, ClassTest> Dictionary2 // переменная Dictionary2 типа Dictionary<> 
    = new Dictionary<string, ClassTest>(); //которая ссылается на объект Dictionary [id=2]
private Dictionary<string, ClassTest> Dictionary3 // переменная Dictionary3 типа Dictionary<> 
    = new Dictionary<string, ClassTest>(); //которая ссылается на объект Dictionary [id=3]

//Dictionary1 -заполняем данными
Dictionary2 = Dictionary1; //переменная Dictionary2 теперь ссылается туда-же, куда и переменная Dictionary1, 
// т.е на Dictionary [id=1]

Dictionary3 = Dictionary1; //переменная Dictionary3 теперь ссылается туда-же, куда и переменная Dictionary1, 
// т.е на Dictionary [id=1]

// a объекты Dictionary [id=2] и Dictionary [id=3] будут собраны сборщиком мусора, т.к. они больше не нужны

UPD:

But how can I make 2 dictionaries like the 1st, that is, I have the 1st dictionary template, I want the 2nd and 3rd dictionaries to initially look the same (have all the same data), but then the data in them changes independently of each other?

well, for example something like this:

var dict1 = new Dictionary<int, int>()
{
    [1] = 2,
};

var dict2 = new Dictionary<int, int>(dict1);

dict1.Add(2, 3);
dict2.Add(2, 1);


var log = new Action<Dictionary<int,int>>((dict) =>
{
    Console.WriteLine(string.Join(", ", dict.Select(c => $"{c.Key}={c.Value}")));
});

log(dict1);  //1=2, 2=3
log(dict2);  //1=2, 2=1