Question

Consider a simple class:

public class TestClass<Val>
{
    public Val Value{get;set;}
}

Create an instance of this class and define a dictionary where we use it as a key.

TestClass<int> TestCase = new TestClass<int>();
Dictionary<TestClass<int>, int> D = new Dictionary<TestClass<int>, int>();

Put 0 into the TestCase and add the entry to dictionary:

TestCase.Value=0
D.Add(TestCase,10)

Now the dictionary looks like this: {TestCase -> Value=0:10}
Now do this:

TestCase.Value=1

Now I have in the dictionary {TestCase -> Value=1 : 10} automatically, without putting the key ‘TestCase -> Value=1’ into the dictionary. How can I avoid it?

Answer 1

Create immutable TestCase class:

public class TestClass<Val>
{
    public TestClass(Val value)
    {
       Value = value;
    }

    public Val Value{ get; private set; }
}